Results are presented of a search for compositeness in electrons and muons using a data sample of pp collisions at a center-of-mass energy = 7 collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 5.0. Excited leptons () are assumed to be produced via contact interactions in conjunction with a standard model lepton and to decay via , yielding a final state with two energetic leptons and a photon. The number of events observed in data is consistent with that expected from the standard model. The 95% confidence upper limits for the cross section for the production and decay of excited electrons (muons), with masses ranging from 0.6 to 2, are 1.48 to 1.24 fb (1.31 to 1.11 fb). Excited leptons with masses below 1.9 are excluded for the case where the contact interaction scale equals the excited lepton mass. The limits on the cross sections are the most stringent ones published to date.
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN)
Search for excited leptons in pp collisions at
The CMS Collaboration111See Appendix A for the list of collaboration members
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Published in Physics Letters B as doi:10.1016/j.physletb.2013.02.031.
© 2019 CERN for the benefit of the CMS Collaboration. CC-BY-3.0 license
The standard model (SM) of particle physics, albeit very successful, provides no explanation for the three generation structure of the fermion families. Attempts to explain the observed hierarchy have led to a family of models postulating that quarks and leptons might be composite objects of fundamental constituents [1, 2, 3, 4, 5, 6, 7, 8, 9]. The fundamental constituents are bound by an asymptotically free gauge interaction that becomes strong at a characteristic scale . Compositeness models predict the existence of excited states of quarks (q) and leptons () at this characteristic scale of the new binding interaction. Since these excited fermions couple to the ordinary SM fermions, they can be produced via contact interactions in collider experiments and subsequently decay radiatively to ordinary fermions through the emission of a W/Z/ boson or via contact interactions to other fermions. The excited leptons can also be produced via gauge-mediated interactions, but the cross sections for these are negligible for the range of parameters that are probed in this search and therefore this production mechanism is not considered. The effective Lagrangian describing the interaction of excited fermions  is parametrized by the scale . Additionally, for decay via gauge mediated interaction, two factors and represent the relative strength of the coupling between the excited fermions and isovector and isoscalar gauge fields, respectively. In this Letter the convention is adopted. The results for arbitrary can be simply obtained by a rescaling of the scale to .
Searches at LEP [10, 11, 12, 13], HERA , and the Tevatron [15, 16, 17, 18] found no evidence for excited leptons. At the Large Hadron Collider (LHC)  at CERN, previous searches performed by the CMS  and the ATLAS collaborations  have also shown no evidence for excited leptons. At a center-of-mass energy of = 7, with 36 of data , CMS has excluded cross sections for the production and decay of the channels higher than 0.16 to 0.21 pb (0.14 to 0.19 pb) in the () channel for excited lepton masses ranging from 0.2 to 2. In the same channels and with more integrated luminosity, ATLAS excluded cross sections higher than 2.3 (4.5) fb for excited electrons (muons) masses above 0.9, and excluded () with masses below 1.87 (1.75) for the scale of contact interaction .
This Letter presents a search for excited leptons, and , using a data sample of pp collisions at a center-of-mass energy = 7 collected with the CMS detector at the LHC in 2011 and corresponding to an integrated luminosity of . The production of an excited lepton in association with an oppositely charged lepton of the same flavor, via four-fermion contact interactions, is considered. Thus when the excited lepton decays via , there are two oppositely charged leptons and a photon in the final state.
2 The CMS detector
The central feature of the Compact Muon Solenoid (CMS) detector is a superconducting solenoid, of 6 m internal diameter and 12.5 m in length, which provides an axial field of 3.8 T. Starting from the collision point, the first three detector components inside the solenoid are the silicon pixel and strip trackers; the lead-tungstate crystal electromagnetic calorimeter (ECAL), comprising a central (barrel) section and two forward (endcap) sections; and the brass/scintillator hadron calorimeter (HCAL). Extensive forward calorimetry complements the coverage provided by the barrel and endcap detectors. The tracker consists of 10 layers of silicon strip detectors in addition to the pixel detectors. Four stations of muon detectors are embedded in the steel yoke of the superconducting solenoid, including forward sections in order to extend the covered pseudorapidity region up to . The pseudorapidity () is defined as . The CMS detector uses a right-handed coordinate system, with the origin at the nominal interaction point, the axis pointing to the center of the LHC, the axis pointing up (perpendicular to the LHC plane), and the axis along the anticlockwise-beam direction. The polar angle is measured from the positive axis and the azimuthal angle is measured in the - plane. The projection of the momentum on to the - plane is used to define the transverse momentum and the transverse energy . The details of the CMS detector are described elsewhere .
3 Signal and background
The dominant, irreducible SM background in this search is Drell–Yan production of where the final state photon is either radiated by an initial-state parton (initial-state radiation, ISR), or originates from one of the final-state leptons (final-state radiation, FSR). The second-most important background is due to Drell–Yan production associated with jets (Z+jets), where a jet is misidentified as a photon (see Section 5). Another important background in the channel is due to W+jets events with an FSR or ISR photon where a jet is misidentified as an electron. In the channel, backgrounds from these W+jets processes that lead to one true, one misidentified muon, and a true photon in the final state have been estimated to be negligible. Other less significant backgrounds originate from diboson events (WW, WZ, ZZ, ), production, and, for the electron channel, production. These backgrounds are mainly suppressed by requiring high transverse momentum thresholds on the leptons and photon. Backgrounds arising from misidentified photons or misidentified electrons are estimated using a data-driven technique which is described in Section 5. The other backgrounds are estimated from the simulation.
Signal samples in both electron and muon channels are produced using pythia (pythia 6.424  and pythia 8.145  respectively) based on the leading order (LO) compositeness model described in Ref. . The signal cross sections are calculated with pythia 6.424, corrected to include the branching ratio for the 3-body decays via contact interaction as per Ref.  which is not implemented in pythia, with the scale set to the square of the mass of the excited lepton ().
Samples are obtained for different values of the excited lepton mass and = 4, with the CTEQ6L1  parametrization for the parton distribution functions. This particular choice of the value of has no impact on the simulated kinematics and all results are presented independently of the value of , except for the signal yield in Fig. 1 and Fig. 2. The SM background samples: , , , , , and are generated with MadGraph 4.5.1 . pythia has been used to perform the fragmentation and hadronization of samples generated with MadGraph. The diboson samples (WZ, ZZ) are generated using pythia 6.424. The main background has been generated to correspond to an integrated luminosity of around . For all these SM background processes, the cross sections are scaled to the next-to-leading order (NLO) cross sections obtained from the parton level integrator mcfm . For the main background , the theoretical scale uncertainty has been evaluated using mcfm to be %, %. All Monte Carlo events used in this analysis have been passed through the detailed simulation of the CMS detector based on Geant4 .
4 Event reconstruction and selection
Candidate events for the electron (muon) channel are selected using triggers with the lowest possible thresholds on lepton transverse momentum. This corresponds to a transverse momentum threshold of 33 (24) for the initial periods and 33 (40) for the later periods of data collection in the electron (muon) channel. The trigger thresholds were raised in response to the increased mean instantaneous luminosity. For the leptons selected in the analysis, the trigger efficiencies are 100% (97%) in the electron (muon) channel. The two leptons and the photon in signal events are expected to be isolated from other particles in the event. This can be quantified by isolation variables, obtained by summing the energy deposits present inside a geometrical cone around the particle, in the tracker or in the calorimeters. Events with at least one well-reconstructed primary vertex, one isolated high- photon, and two isolated high- leptons are used in this analysis.
Electron identification is performed using clusters of localized energy deposits in the ECAL. An energy deposit in the ECAL due to an electron is identified by imposing requirements on shower shapes of the ECAL clusters and isolation variables as well as the ratio of the energies deposited in the hadron and electromagnetic calorimeters (). A reconstructed track correctly associated with an ECAL cluster is also required. For the electron channel, the electrons are required to have a transverse energy (40) in the ECAL barrel (endcap) and , excluding the transition region between the ECAL barrel and endcap regions. The electron is required to be isolated both in the tracker and calorimeter within a cone of radius around its direction. In the tracker, the scalar sum of the of the tracks, that are at least 0.7 in and lie outside a cone of radius relative to the electron, is required to be less than 5. For the isolation using the calorimeters, a variable is introduced, defined as the total sum of transverse energy deposits excluding deposits associated with the electron. In the barrel, is required to be less than , and in the endcap: for , the total is required to be below ; for , it is required to be below .
For photons, identification criteria on the shower shapes, isolation variables and H/E are applied to energy clusters in the ECAL . Photon candidates are required to have clusters with and to be in the central region (barrel) of the ECAL with 1.4442. The photon is also required to be isolated within a cone of radius around its direction, both in the tracker and calorimeter. The cone axis is taken to be the direction of the line joining the barycenter of the energy cluster to the primary vertex. In the tracker, the scalar sum of the transverse momenta of the tracks, excluding tracks within an inner cone of 0.04, is required to be less than . In the ECAL, the total in the barrel, excluding deposits associated with the photon, is required to be below , whereas for the HCAL isolation, it is required to be below .
Muons are reconstructed by combining tracks from the inner tracker and the outer muon system, requiring at least one hit in the pixel tracker, hits in more than 8 tracker layers and track segments reconstructed in at least two muon stations. Since the segments have multiple hits that typically occur in different muon detectors and are therefore separated by thick layers of iron, the latter requirement significantly reduces the probability of a hadron being misidentified as a muon. For the muon channel, two muons are required with each having 2.1; and the higher (lower) momentum muon must have (40). In order to reduce the cosmic-rays muon background, the transverse impact parameters of both muon tracks with respect to the primary vertex of the event are required to be less than 0.2 cm and muon pairs that are back-to-back in the transverse plane are rejected, with the angle between two muon tracks below . Furthermore, the muon is required to be isolated such that the scalar sum of the transverse momenta of all tracks originating at the interaction vertex, excluding the muon itself, within a cone around its direction is less than 10% of its .
In order to reject Drell–Yan events with final state radiation, the distance in (, ) coordinates between the photon and the leading lepton, is required to be for and for . Two lepton-photon invariant masses can also be computed, because the final state is composed of two leptons and one photon. For the electron channel, the dielectron invariant mass is required to be above 60 and each of the dielectron and electron-photon invariant masses are required to be outside a window centered at the nominal Z mass (91.19). For the muon channel, the dilepton invariant mass is required to be 25 above the nominal Z mass. Fig. 1 shows the distribution of and , the lower and higher invariant mass respectively. In the case of a signal, the correct assignment peaks at the excited lepton mass. In the - plane, the signal is distributed along two mutually perpendicular narrow bands. This shape determines the final selection cuts as outlined below and is illustrated in Fig. 2 for . Identical boundaries are used for the electron and muon channel. The only difference in the selection between the two channels is the Z veto, which, in the electron channel, is also applied on electron-photon invariant mass.
The background is located in the low invariant mass region, while the signal populates the higher invariant mass region. Using simulations, the boundaries of the signal region for a given mass have been chosen to optimize the expected limit. The final values for different excited lepton masses are shown in Table 2. For , the horizontal band is small, in order to reduce the background contamination. For , a larger horizontal band can be used, the increase of the background contamination being compensated by the gain in signal efficiency. For higher excited lepton masses, the horizontal band is large to improve the signal efficiency in regions where almost no background is present.
|Electron channel||Muon channel|
|0.2||0.19-0.21||0.20-0.21||24.8 1.8||1.0||2||28.2 1.3||1.2||2|
|0.3||0.23-0.37||0.29-0.31||30.0 2.2||1.2||1||34.4 1.6||5.4||2|
|0.4||0.28-0.52||0.38-0.41||32.7 2.4||0.1||1||39.1 1.8||1.6||3|
|0.5||0.35-0.65||0.47-0.53||34.8 2.6||0.0||1||42.1 1.9||0.0||1|
|0.6||0.42-0.78||0.55-0.64||36.6 2.6||0.0||0||45.4 2.0||0.0||0|
|0.7||0.49-0.91||0.65-0.76||37.8 2.7||0.1||0||45.9 2.1||1.0||0|
|0.8||0.56-1.04||0.75-0.88||37.8 2.7||0.0||0||45.3 2.0||0.0||0|
|1.0||0.70-1.30||0.75-1.08||40.4 2.8||0.0||0||48.5 2.1||0.0||0|
|1.2||0.84-1.56||0.75-1.34||41.1 2.9||0.0||0||50.0 2.2||0.0||0|
|1.5||1.05-1.95||0.75-1.67||41.7 2.9||0.0||0||50.8 2.2||0.0||0|
|2.0||1.40-2.60||0.75-2.23||43.5 3.1||0.0||0||50.4 2.2||0.0||0|
5 Background due to particle misidentification
Hadronic jets in which a carries a significant fraction of the energy may be misidentified as isolated photons. Thus Z+jets events are a potential background for this search. The photon misidentification rate is measured directly from a data sample dominated by jets, with a photon-like candidate cluster embedded inside, which can potentially be misidentified as a photon. The misidentification rate is defined as the ratio of the number of photon candidates passing all the photon selection criteria (numerator) to the number of photon candidates that pass a loose set of shower shape requirements but fail one of the photon isolation criteria (denominator). The misidentification rate is estimated in bins of photon . The numerator sample can have a contribution from isolated true photons. This misidentification rate is therefore corrected by using the probability distribution of energy-weighted shower width () of isolated true photons computed in units of crystal size, which is different from that of non-isolated photons. The true photon fraction in the numerator is estimated by fitting these two different shower shapes to the shower shape distribution of the numerator sample, and subtracted from the numerator. In order to estimate the contribution of misidentified photons in the analysis, the misidentification rate is applied to a subsample of data events containing one photon candidate and satisfying all other selection criteria. This rate is calculated in photon bins of (0.03–0.05, 0.05–0.075, 0.075–0.09, 0.09–0.2). Fig. 3 shows the dependence of the photon misidentification rate. The calculated misidentified photon rate is found to be 0.28, 0.07, 0.06 and 0.09 for the above mentioned bins.
From a fit, the measured rate is parametrized by a function, , as given in the equation (1) with , and being the fit parameters:
An uncertainty of 40% is assigned to this function which envelopes the spread of data points relative to the fit. The jet to photon misidentication is estimated by applying this misidentification rate to a sample passing all our selection requirements, including triggers, except a requirement that the photon candidate fails one of the photon identification criteria and passes instead the loose identification requirements. Applied to the lowest mass point of 0.2, the contribution of photon misidentification background in the full selection is found to be 0.07 events for both the electron and the muon channels. It is negligible for higher mass points.
|Electron channel||Muon channel|
Backgrounds with zero or one real electron can contribute to the search. The largest contributions come from processes such as + jet + where the jet in the event is misidentified as an electron. Misidentification can occur when photons coming from s inside a jet convert to an pair and are misidentified as electrons. Other possible sources include when a charged particle within a jet provides both the track in the tracker and an electromagnetic cluster that together fake an electron signature, or when a track from a charged particle matches with a nearby energy deposition in the calorimeter from another particle. The misidentification rate is calculated as the ratio between the number of candidates passing the electron selection criteria with respect to those satisfying looser selection criteria. The looser selection criteria require only that the first tracker layer contributes a hit to the electron track and that offline emulations of the online trigger requirements (“loose identification requirements”) on shower shape and the ratio are satisfied. This ratio is estimated as a function of in bins of () using a data sample selected with single-photon triggers . The jet to electron misidentified background in is estimated by applying this misidentification rate to a sample passing all our selection requirements, including triggers, except requiring one of the electron candidates to fail the electron identification criteria and pass instead the loose identification requirements. The systematic uncertainty on is determined using a sample of events containing two reconstructed electrons as in . The contribution from jet events to the dielectron mass spectrum can be determined either by applying the misidentification rate twice on events with two loose electrons or by applying the misidentification rate once on events with one fully identified electron and one loose electron. The first estimate lacks contributions from W + jets and + jets events while the second estimate is contaminated by Drell–Yan events. These effects are corrected using simulated samples. If the misidentification rate method is correct, the two corrected estimations should agree. Both estimates are found to agree well and the residual difference of 40% between the two estimates is taken as the systematic uncertainty on the jet to electron misidentification rate. The contribution from events which have zero or one real electron is for the lowest mass point of 0.2 and is negligible for higher mass points.
After all selection steps the expected background for is found to be event in the simulated sample. The signal efficiency increases with the mass of the excited lepton, from 25% to 44% in the electron channel and 28% to 50% in the muon channel. All numbers are summarized in Table 2. The expected numbers of signal events and irreducible background events are evaluated from simulation while the contribution of misidentified particles is derived from data. The background composition for several mass points, 0.2, 0.4 and 0.6 for both channels is shown in Table 4. The uncertainties in the description of the detector performance, such as lepton energy or momentum resolution, lepton and photon energy scales, have been included in the systematic uncertainties. The impact on the signal yield corresponds to an uncertainty of 2% and 3.5%, for the electron and muon channels respectively. Effects caused by the increase in the typical number of additional pp interactions (‘pileup’) per LHC bunch crossing are modeled by adding to the generated events multiple collisions with a multiplicity distribution matched to the luminosity profile of the collision data. To evaluate the systematic uncertainty associated with the pileup simulation, the mean of the distribution of the pileup interactions is varied by 5%, leading to a variation of 3.0% (0.6%) in the simulated backgrounds and 1.0% (1.5%) in signal yields in the electron (muon) channel. An additional systematic uncertainty of 10% is assigned to the background to account for uncertainties associated with the choice of parton distribution functions. The uncertainty in the luminosity normalization is 2.2% .
As seen in Table 2, for masses above 0.5, no data events pass the criteria designed to select excited lepton signatures. Using a single bin counting method, upper limits are provided on the production cross section times branching fraction of excited electrons and excited muons at the 95% confidence level. The method is implemented in the statistical package developed by the Higgs study group . The computation has been performed using both a Bayesian [34, 35] and a [36, 37] approach; the results are found to be consistent with each other. The results presented here are from the frequentist CL approach, without the use of the asymptotic approximation . The background and signal uncertainties are dominated by completely uncorrelated uncertainties. The integrated luminosity normalization uncertainty is considered separately, with 100% correlation between signal and background. The nuisance parameters related to the uncertainties on the background are treated according to gamma probability distribution functions. The uncertainties on the signal yield and the integrated luminosity normalization are taken into account via a lognormal treatment of nuisance parameters. The observed limits for the electron and the muon channels are shown in Fig. 4. Production cross sections higher than 1.48 to 1.24 fb (1.31 to 1.11 fb) are excluded at the 95% confidence limit (CL) for () masses ranging from 0.6 to 2. The structure observed in the expected and observed limits results from the limited sizes of the simulated background samples. The optimization of the invariant masses selecting the – signal region has been determined from simulation of signal reference mass points, ranging from = 0.2 to 2.0 in steps of 0.2. For lower masses, the selected signal regions do not overlap. For continuous coverage, additional mass points for , have been added by interpolating the cut thresholds and the signal efficiencies. Limits for masses between 0.2 and 0.4 are less stringent because of the presence of background in this region.
In the excited muon channel, as visible in Table 2, the bump at 0.5 corresponds to a region where the background is found to be in the simulated sample while one data event is observed. Also in this channel, the shape of the uncertainty bands at corresponds to a region where the background is found to be in the simulated sample while zero data events are observed. For high excited lepton masses, the muon channel cross section limit is slightly lower than the electron channel limit because of the difference in the acceptance. For lower excited lepton masses, the sensitivity of the electron channel is also reduced because of misidentification of photons and electrons.
The set of values for which the theoretical cross section times branching fraction is higher than the 95% upper limit on cross section, is considered as excluded region of the parameter space. The exclusion region in the plane is shown in Fig. 5. The displayed uncertainty band corresponds to the uncertainty on the cross section limits, and does not take into account uncertainties on the theoretical signal cross section. The region is theoretically excluded, where . The signal cross sections are estimated with the scale set to the square of the mass of excited lepton (). If the scale is varied to /2, the limit for increases by 1.5% and if it is varied to 2, the limit for decreases by 2.4%. The impact of the parton distribution functions (PDF) uncertainties on the signal is smaller than 1%.
Assuming the same masses for and , the two counting experiments have been combined using the CL approach, improving the excluded cross section limit to 0.73 to 0.60 fb for masses from 0.6 to 2. Allowing and to have different masses, the excluded cross sections would also be within this range. The following uncertainties have been considered as completely correlated between the two channels: the photon scale factor uncertainties in signal and background, the photon misidentification rate systematic uncertainty not related to statistics, the luminosity uncertainty, the pileup simulation uncertainty, the normalization uncertainty, and the PDF uncertainty. The other uncertainties are considered as 100% uncorrelated.
A search has been performed with the CMS detector for excited leptons in the electron () and muon () channels. For each excited lepton mass, the excluded cross section can be associated with a value for the new interaction scale . Excited leptons (electrons or muons) with masses below 1.9 are excluded for the scale of contact interaction . Production cross sections higher than 1.48 to 1.24 fb (1.31 to 1.11 fb) are excluded at the 95% CL for () masses ranging from 0.6 to 2. The slightly better sensitivity in the muon channel is due to its better acceptance and efficiency, and also, for lower masses, to the fact that there is a higher background background in the electron channel arising from particle misidentification. These limits are the most stringent published to date.
We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC machine. We thank the technical and administrative staff at CERN and other CMS institutes, and acknowledge support from: FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); MoER, SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); I (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MSI (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MON, RosAtom, RAS and RFBR (Russia); MSTD (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie programme and the European Research Council (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Council of Scientific and Industrial Research, India; and the HOMING PLUS programme of Foundation for Polish Science, cofinanced from European Union, Regional Development Fund.
-  J. C. Pati, A. Salam, and J. A. Strathdee, “Are quarks composite?”, Phys. Lett. B 59 (1975) 265, doi:10.1016/0370-2693(75)90042-8.
-  H. Terazawa, M. Yasuè, K. Akama, and M. Hayshi, “Observable effects of the possible substructure of leptons and quarks”, Phys. Lett. B 112 (1982) 387, doi:10.1016/0370-2693(82)91075-9.
-  M. Abolins et al., “Testing the Compositeness of Quarks and Leptons”, in Elementary Particles and Future Facilities (Snowmass 1982), p. 274. 1982. eConf C8206282.
-  E. Eichten, K. D. Lane, and M. E. Peskin, “New Tests for Quark and Lepton Substructure”, Phys. Rev. Lett. 50 (1983) 811, doi:10.1103/PhysRevLett.50.811.
-  H. Harari, “Composite models for quarks and leptons”, Physics Reports 104 (1984) 159, doi:10.1016/0370-1573(84)90207-2.
-  K. D. Lane, F. E. Paige, T. Skwarnicki, and W. J. Womersley, “Simulations of supercollider physics”, Phys. Rept. 278 (1997) 291, doi:10.1016/S0370-1573(96)00018-X, arXiv:hep-ph/9412280.
-  U. Baur, M. Spira, and P. M. Zerwas, “Excited quark and lepton production at hadron colliders”, Phys. Rev. D 42 (1990) 815, doi:10.1103/PhysRevD.42.815.
-  O. W. Greenberg and C. A. Nelson, “Composite Models of Leptons”, Phys. Rev. D 10 (1974) 2567, doi:10.1103/PhysRevD.10.2567.
-  O. W. Greenberg and J. Sucher, “A quantum structure dynamic model of quarks, leptons, weak vector bosons, and Higgs mesons”, Phys. Lett. B 99 (1981) 339, doi:10.1016/0370-2693(81)90113-1.
-  ALEPH Collaboration, “Search for excited leptons at 130–140 GeV”, Phys. Lett. B 385 (1996) 445, doi:10.1016/0370-2693(96)00961-6.
-  DELPHI Collaboration, “Search for composite and exotic fermions at LEP 2”, Eur. Phys. J. C 8 (1999) 41, doi:10.1007/s100529901074, arXiv:hep-ex/9811005.
-  OPAL Collaboration, “Search for unstable heavy and excited leptons at LEP 2”, Eur. Phys. J. C 14 (2000) 73, doi:10.1007/s100520050734, arXiv:hep-ex/0001056.
-  L3 Collaboration, “Search for excited leptons at LEP”, Phys. Lett. B 568 (2003) 23, doi:10.1016/j.physletb.2003.05.004, arXiv:hep-ex/0306016.
-  H1 Collaboration, “Search for excited electrons in collisions at HERA”, Phys. Lett. B 666 (2008) 131, doi:10.1016/j.physletb.2008.07.014, arXiv:0805.4530.
-  CDF Collaboration, “Search for Excited and Exotic Electrons in the Decay Channel in Collisions at = 1.96 TeV”, Phys. Rev. Lett. 94 (2005) 101802, doi:10.1103/PhysRevLett.94.101802, arXiv:hep-ex/0410013.
-  CDF Collaboration, “Search for Excited and Exotic Muons in the Decay Channel in Collisions at = 1.96 TeV”, Phys. Rev. Lett. 97 (2006) 191802, doi:10.1103/PhysRevLett.97.191802, arXiv:hep-ex/0606043.
-  D0 Collaboration, “Search for excited muons in collisions at TeV”, Phys. Rev. D 73 (2006) 111102, doi:10.1103/PhysRevD.73.111102, arXiv:hep-ex/0604040.
-  D0 Collaboration, “Search for excited electrons in collisions at TeV”, Phys. Rev. D 77 (2008) 091102, doi:10.1103/PhysRevD.77.091102, arXiv:0801.0877.
-  L. Evans and P. Bryant, “LHC Machine”, JINST 3 (2008) S08001, doi:10.1088/1748-0221/3/08/S08001.
-  CMS Collaboration, “A search for excited leptons in pp collisions at = 7 TeV”, Phys. Lett. B 704 (2011) 143, doi:10.1016/j.physletb.2011.09.021, arXiv:1107.1773.
-  ATLAS Collaboration, “Search for excited leptons in proton-proton collisions at = 7 TeV with the ATLAS detector”, Phys. Rev. D 85 (2012) 072003, doi:10.1103/PhysRevD.85.072003, arXiv:1201.3293.
-  CMS Collaboration, “The CMS experiment at the CERN LHC”, JINST 03 (2008) S08004, doi:10.1088/1748-0221/3/08/S08004.
-  T. Sjöstrand, S. Mrenna, and P. Z. Skands, “PYTHIA 6.4 physics and manual”, JHEP 05 (2006) 026, doi:10.1088/1126-6708/2006/05/026, arXiv:hep-ph/0603175.
-  T. Sjöstrand, S. Mrenna, and P. Z. Skands, “A brief introduction to PYTHIA 8.1”, Comput. Phys. Commun. 178 (2008) 852, doi:10.1016/j.cpc.2008.01.036, arXiv:hep-ph/07103820.
-  J. Pumplin et al., “New Generation of Parton Distributions with Uncertainties from Global QCD Analysis”, JHEP 07 (2002) 012, doi:10.1088/1126-6708/2002/07/012, arXiv:hep-ph/0201195.
-  J. Alwall et al., “MadGraph/MadEvent v4: The New Web Generation”, JHEP 0709 (2007) 028, doi:10.1088/1126-6708/2007/09/028, arXiv:0706.2334.
-  J. M. Campbell and R. K. Ellis, “MCFM for the Tevatron and the LHC”, in Loops and Legs in Quantum Field Theory, DESY Workshop on Elementary Particle Theory. 2010. arXiv:1007.3492. Nucl. Phys. Proc. Suppl. 205–206. doi:10.1016/j.nuclphysbps.2010.08.011.
-  GEANT4 Collaboration, “GEANT4—a simulation toolkit”, Nucl. Instrum. Meth. A 506 (2003) 250, doi:10.1016/S0168-9002(03)01368-8.
-  CMS Collaboration, “Photon Reconstruction and Identification at = 7 TeV”, CMS Physics Analysis Summary EGM-10-005 (2010).
-  C. J. Clopper and E. S. Pearson, “The Use of Confidence or Fiducial Limits Illustrated in the Case of the Binomial”, Biometrika 26 (1934) 404, doi:10.1093/biomet/26.4.404.
-  CMS Collaboration, “Search for Contact Interactions in Events in pp Collisions at = 7 TeV”, CMS Physics Analysis Summary CMS-PAS-EXO-11-009, 2011.
-  CMS Collaboration, “Absolute Calibration of the Luminosity Measurement at CMS: Winter 2012 Update”, CMS Physics Analysis Summary CMS-PAS-SMP-12-008, 2012.
-  ATLAS and CMS Collaborations, “Procedure for the LHC Higgs boson search combination in Summer 2011”, Technical Report CMS-NOTE-2011-005, ATL-PHYS-PUB-2011-011, CERN, Geneva, 2011.
-  J. Heinrich et al., “interval estimation in the presence of nuisance parameters. 1. Bayesian approach”, (2004). arXiv:physics/0409129.
-  K. Nakamura et al., “The Review of Particle Physics”, J. Phys. G 37 (2010) 075021, doi:10.1088/0954-3899/37/7A/075021. Sec. 33.3.1.
-  A. L. Read, “Presentation of search results: the technique”, J. Phys. G 28 (2002), no. 10, 2693, doi:10.1088/0954-3899/28/10/313.
-  T. Junk, “Confidence level computation for combining searches with small statistics”, Nucl. Instrum. Meth. A 434 (1999) 435, doi:10.1016/S0168-9002(99)00498-2, arXiv:hep-ex/9902006.
Appendix A The CMS Collaboration
Yerevan Physics Institute, Yerevan, Armenia
S. Chatrchyan, V. Khachatryan, A.M. Sirunyan, A. Tumasyan Institut für Hochenergiephysik der OeAW, Wien, Austria
W. Adam, E. Aguilo, T. Bergauer, M. Dragicevic, J. Erö, C. Fabjan\@textsuperscript1, M. Friedl, R. Frühwirth\@textsuperscript1, V.M. Ghete, J. Hammer, N. Hörmann, J. Hrubec, M. Jeitler\@textsuperscript1, W. Kiesenhofer, V. Knünz, M. Krammer\@textsuperscript1, I. Krätschmer, D. Liko, I. Mikulec, M. Pernicka, B. Rahbaran, C. Rohringer, H. Rohringer, R. Schöfbeck, J. Strauss, A. Taurok, W. Waltenberger, G. Walzel, E. Widl, C.-E. Wulz\@textsuperscript1 National Centre for Particle and High Energy Physics, Minsk, Belarus
V. Mossolov, N. Shumeiko, J. Suarez Gonzalez Universiteit Antwerpen, Antwerpen, Belgium
M. Bansal, S. Bansal, T. Cornelis, E.A. De Wolf, X. Janssen, S. Luyckx, L. Mucibello, S. Ochesanu, B. Roland, R. Rougny, M. Selvaggi, Z. Staykova, H. Van Haevermaet, P. Van Mechelen, N. Van Remortel, A. Van Spilbeeck Vrije Universiteit Brussel, Brussel, Belgium
F. Blekman, S. Blyweert, J. D’Hondt, R. Gonzalez Suarez, A. Kalogeropoulos, M. Maes, A. Olbrechts, W. Van Doninck, P. Van Mulders, G.P. Van Onsem, I. Villella Université Libre de Bruxelles, Bruxelles, Belgium
B. Clerbaux, G. De Lentdecker, V. Dero, A.P.R. Gay, T. Hreus, A. Léonard, P.E. Marage, A. Mohammadi, T. Reis, L. Thomas, G. Vander Marcken, C. Vander Velde, P. Vanlaer, J. Wang Ghent University, Ghent, Belgium
V. Adler, K. Beernaert, A. Cimmino, S. Costantini, G. Garcia, M. Grunewald, B. Klein, J. Lellouch, A. Marinov, J. Mccartin, A.A. Ocampo Rios, D. Ryckbosch, N. Strobbe, F. Thyssen, M. Tytgat, P. Verwilligen, S. Walsh, E. Yazgan, N. Zaganidis Université Catholique de Louvain, Louvain-la-Neuve, Belgium
S. Basegmez, G. Bruno, R. Castello, L. Ceard, C. Delaere, T. du Pree, D. Favart, L. Forthomme, A. Giammanco\@textsuperscript2, J. Hollar, V. Lemaitre, J. Liao, O. Militaru, C. Nuttens, D. Pagano, A. Pin, K. Piotrzkowski, N. Schul, J.M. Vizan Garcia Université de Mons, Mons, Belgium
N. Beliy, T. Caebergs, E. Daubie, G.H. Hammad Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil
G.A. Alves, M. Correa Martins Junior, D. De Jesus Damiao, T. Martins, M.E. Pol, M.H.G. Souza Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
W.L. Aldá Júnior, W. Carvalho, A. Custódio, E.M. Da Costa, C. De Oliveira Martins, S. Fonseca De Souza, D. Matos Figueiredo, L. Mundim, H. Nogima, V. Oguri, W.L. Prado Da Silva, A. Santoro, L. Soares Jorge, A. Sznajder Instituto de Fisica Teorica, Universidade Estadual Paulista, Sao Paulo, Brazil
T.S. Anjos\@textsuperscript3, C.A. Bernardes\@textsuperscript3, F.A. Dias\@textsuperscript4, T.R. Fernandez Perez Tomei, E.M. Gregores\@textsuperscript3, C. Lagana, F. Marinho, P.G. Mercadante\@textsuperscript3, S.F. Novaes, Sandra S. Padula Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
V. Genchev\@textsuperscript5, P. Iaydjiev\@textsuperscript5, S. Piperov, M. Rodozov, S. Stoykova, G. Sultanov, V. Tcholakov, R. Trayanov, M. Vutova University of Sofia, Sofia, Bulgaria
A. Dimitrov, R. Hadjiiska, V. Kozhuharov, L. Litov, B. Pavlov, P. Petkov Institute of High Energy Physics, Beijing, China
J.G. Bian, G.M. Chen, H.S. Chen, C.H. Jiang, D. Liang, S. Liang, X. Meng, J. Tao, J. Wang, X. Wang, Z. Wang, H. Xiao, M. Xu, J. Zang, Z. Zhang State Key Lab. of Nucl. Phys. and Tech., Peking University, Beijing, China
C. Asawatangtrakuldee, Y. Ban, Y. Guo, W. Li, S. Liu, Y. Mao, S.J. Qian, H. Teng, D. Wang, L. Zhang, W. Zou Universidad de Los Andes, Bogota, Colombia
C. Avila, J.P. Gomez, B. Gomez Moreno, A.F. Osorio Oliveros, J.C. Sanabria Technical University of Split, Split, Croatia
N. Godinovic, D. Lelas, R. Plestina\@textsuperscript6, D. Polic, I. Puljak\@textsuperscript5 University of Split, Split, Croatia
Z. Antunovic, M. Kovac Institute Rudjer Boskovic, Zagreb, Croatia
V. Brigljevic, S. Duric, K. Kadija, J. Luetic, S. Morovic University of Cyprus, Nicosia, Cyprus
A. Attikis, M. Galanti, G. Mavromanolakis, J. Mousa, C. Nicolaou, F. Ptochos, P.A. Razis Charles University, Prague, Czech Republic
M. Finger, M. Finger Jr. Academy of Scientific Research and Technology of the Arab Republic of Egypt, Egyptian Network of High Energy Physics, Cairo, Egypt
Y. Assran\@textsuperscript7, S. Elgammal\@textsuperscript8, A. Ellithi Kamel\@textsuperscript9, S. Khalil\@textsuperscript8, M.A. Mahmoud\@textsuperscript10, A. Radi\@textsuperscript11\@textsuperscript12 National Institute of Chemical Physics and Biophysics, Tallinn, Estonia
M. Kadastik, M. Müntel, M. Raidal, L. Rebane, A. Tiko Department of Physics, University of Helsinki, Helsinki, Finland
P. Eerola, G. Fedi, M. Voutilainen Helsinki Institute of Physics, Helsinki, Finland
J. Härkönen, A. Heikkinen, V. Karimäki, R. Kinnunen, M.J. Kortelainen, T. Lampén, K. Lassila-Perini, S. Lehti, T. Lindén, P. Luukka, T. Mäenpää, T. Peltola, E. Tuominen, J. Tuominiemi, E. Tuovinen, D. Ungaro, L. Wendland Lappeenranta University of Technology, Lappeenranta, Finland
K. Banzuzi, A. Karjalainen, A. Korpela, T. Tuuva DSM/IRFU, CEA/Saclay, Gif-sur-Yvette, France
M. Besancon, S. Choudhury, M. Dejardin, D. Denegri, B. Fabbro, J.L. Faure, F. Ferri, S. Ganjour, A. Givernaud, P. Gras, G. Hamel de Monchenault, P. Jarry, E. Locci, J. Malcles, L. Millischer, A. Nayak, J. Rander, A. Rosowsky, I. Shreyber, M. Titov Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
S. Baffioni, F. Beaudette, L. Benhabib, L. Bianchini, M. Bluj\@textsuperscript13, C. Broutin, P. Busson, C. Charlot, N. Daci, T. Dahms, L. Dobrzynski, R. Granier de Cassagnac, M. Haguenauer, P. Miné, C. Mironov, I.N. Naranjo, M. Nguyen, C. Ochando, P. Paganini, D. Sabes, R. Salerno, Y. Sirois, C. Veelken, A. Zabi Institut Pluridisciplinaire Hubert Curien, Université de Strasbourg, Université de Haute Alsace Mulhouse, CNRS/IN2P3, Strasbourg, France
J.-L. Agram\@textsuperscript14, J. Andrea, D. Bloch, D. Bodin, J.-M. Brom, M. Cardaci, E.C. Chabert, C. Collard, E. Conte\@textsuperscript14, F. Drouhin\@textsuperscript14, C. Ferro, J.-C. Fontaine\@textsuperscript14, D. Gelé, U. Goerlach, P. Juillot, A.-C. Le Bihan, P. Van Hove Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules, CNRS/IN2P3, Villeurbanne, France, Villeurbanne, France
F. Fassi, D. Mercier Université de Lyon, Université Claude Bernard Lyon 1, CNRS-IN2P3, Institut de Physique Nucléaire de Lyon, Villeurbanne, France
S. Beauceron, N. Beaupere, O. Bondu, G. Boudoul, J. Chasserat, R. Chierici\@textsuperscript5, D. Contardo, P. Depasse, H. El Mamouni, J. Fay, S. Gascon, M. Gouzevitch, B. Ille, T. Kurca, M. Lethuillier, L. Mirabito, S. Perries, L. Sgandurra, V. Sordini, Y. Tschudi, P. Verdier, S. Viret Institute of High Energy Physics and Informatization, Tbilisi State University, Tbilisi, Georgia
Z. Tsamalaidze\@textsuperscript15 RWTH Aachen University, I. Physikalisches Institut, Aachen, Germany
G. Anagnostou, C. Autermann, S. Beranek, M. Edelhoff, L. Feld, N. Heracleous, O. Hindrichs, R. Jussen, K. Klein, J. Merz, A. Ostapchuk, A. Perieanu, F. Raupach, J. Sammet, S. Schael, D. Sprenger, H. Weber, B. Wittmer, V. Zhukov\@textsuperscript16 RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany
M. Ata, J. Caudron, E. Dietz-Laursonn, D. Duchardt, M. Erdmann, R. Fischer, A. Güth, T. Hebbeker, C. Heidemann, K. Hoepfner, D. Klingebiel, P. Kreuzer, M. Merschmeyer, A. Meyer, M. Olschewski, P. Papacz, H. Pieta, H. Reithler, S.A. Schmitz, L. Sonnenschein, J. Steggemann, D. Teyssier, M. Weber RWTH Aachen University, III. Physikalisches Institut B, Aachen, Germany
M. Bontenackels, V. Cherepanov, Y. Erdogan, G. Flügge, H. Geenen, M. Geisler, W. Haj Ahmad, F. Hoehle, B. Kargoll, T. Kress, Y. Kuessel, J. Lingemann\@textsuperscript5, A. Nowack, L. Perchalla, O. Pooth, P. Sauerland, A. Stahl Deutsches Elektronen-Synchrotron, Hamburg, Germany
M. Aldaya Martin, J. Behr, W. Behrenhoff, U. Behrens, M. Bergholz\@textsuperscript17, A. Bethani, K. Borras, A. Burgmeier, A. Cakir, L. Calligaris, A. Campbell, E. Castro, F. Costanza, D. Dammann, C. Diez Pardos, G. Eckerlin, D. Eckstein, G. Flucke, A. Geiser, I. Glushkov, P. Gunnellini, S. Habib, J. Hauk, G. Hellwig, H. Jung, M. Kasemann, P. Katsas, C. Kleinwort, H. Kluge, A. Knutsson, M. Krämer, D. Krücker, E. Kuznetsova, W. Lange, W. Lohmann\@textsuperscript17, B. Lutz, R. Mankel, I. Marfin, M. Marienfeld, I.-A. Melzer-Pellmann, A.B. Meyer, J. Mnich, A. Mussgiller, S. Naumann-Emme, O. Novgorodova, J. Olzem, H. Perrey, A. Petrukhin, D. Pitzl, A. Raspereza, P.M. Ribeiro Cipriano, C. Riedl, E. Ron, M. Rosin, J. Salfeld-Nebgen, R. Schmidt\@textsuperscript17, T. Schoerner-Sadenius, N. Sen, A. Spiridonov, M. Stein, R. Walsh, C. Wissing University of Hamburg, Hamburg, Germany
V. Blobel, J. Draeger, H. Enderle, J. Erfle, U. Gebbert, M. Görner, T. Hermanns, R.S. Höing, K. Kaschube, G. Kaussen, H. Kirschenmann, R. Klanner, J. Lange, B. Mura, F. Nowak, T. Peiffer, N. Pietsch, D. Rathjens, C. Sander, H. Schettler, P. Schleper, E. Schlieckau, A. Schmidt, M. Schröder, T. Schum, M. Seidel, V. Sola, H. Stadie, G. Steinbrück, J. Thomsen, L. Vanelderen Institut für Experimentelle Kernphysik, Karlsruhe, Germany
C. Barth, J. Berger, C. Böser, T. Chwalek, W. De Boer, A. Descroix, A. Dierlamm, M. Feindt, M. Guthoff\@textsuperscript5, C. Hackstein, F. Hartmann, T. Hauth\@textsuperscript5, M. Heinrich, H. Held, K.H. Hoffmann, U. Husemann, I. Katkov\@textsuperscript16, J.R. Komaragiri, P. Lobelle Pardo, D. Martschei, S. Mueller, Th. Müller, M. Niegel, A. Nürnberg, O. Oberst, A. Oehler, J. Ott, G. Quast, K. Rabbertz, F. Ratnikov, N. Ratnikova, S. Röcker, F.-P. Schilling, G. Schott, H.J. Simonis, F.M. Stober, D. Troendle, R. Ulrich, J. Wagner-Kuhr, S. Wayand, T. Weiler, M. Zeise Institute of Nuclear Physics ”Demokritos”, Aghia Paraskevi, Greece
G. Daskalakis, T. Geralis, S. Kesisoglou, A. Kyriakis, D. Loukas, I. Manolakos, A. Markou, C. Markou, C. Mavrommatis, E. Ntomari University of Athens, Athens, Greece
L. Gouskos, T.J. Mertzimekis, A. Panagiotou, N. Saoulidou University of Ioánnina, Ioánnina, Greece
I. Evangelou, C. Foudas, P. Kokkas, N. Manthos, I. Papadopoulos, V. Patras KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
G. Bencze, C. Hajdu, P. Hidas, D. Horvath\@textsuperscript18, F. Sikler, V. Veszpremi, G. Vesztergombi\@textsuperscript19 Institute of Nuclear Research ATOMKI, Debrecen, Hungary
N. Beni, S. Czellar, J. Molnar, J. Palinkas, Z. Szillasi University of Debrecen, Debrecen, Hungary
J. Karancsi, P. Raics, Z.L. Trocsanyi, B. Ujvari Panjab University, Chandigarh, India
S.B. Beri, V. Bhatnagar, N. Dhingra, R. Gupta, M. Kaur, M.Z. Mehta, N. Nishu, L.K. Saini, A. Sharma, J.B. Singh University of Delhi, Delhi, India
Ashok Kumar, Arun Kumar, S. Ahuja, A. Bhardwaj, B.C. Choudhary, S. Malhotra, M. Naimuddin, K. Ranjan, V. Sharma, R.K. Shivpuri Saha Institute of Nuclear Physics, Kolkata, India
S. Banerjee, S. Bhattacharya, S. Dutta, B. Gomber, Sa. Jain, Sh. Jain, R. Khurana, S. Sarkar, M. Sharan Bhabha Atomic Research Centre, Mumbai, India
A. Abdulsalam, R.K. Choudhury, D. Dutta, S. Kailas, V. Kumar, P. Mehta, A.K. Mohanty\@textsuperscript5, L.M. Pant, P. Shukla Tata Institute of Fundamental Research - EHEP, Mumbai, India
T. Aziz, S. Ganguly, M. Guchait\@textsuperscript20, M. Maity\@textsuperscript21, G. Majumder, K. Mazumdar, G.B. Mohanty, B. Parida, K. Sudhakar, N. Wickramage Tata Institute of Fundamental Research - HECR, Mumbai, India
S. Banerjee, S. Dugad Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
H. Arfaei\@textsuperscript22, H. Bakhshiansohi, S.M. Etesami\@textsuperscript23, A. Fahim\@textsuperscript22, M. Hashemi, H. Hesari, A. Jafari, M. Khakzad, M. Mohammadi Najafabadi, S. Paktinat Mehdiabadi, B. Safarzadeh\@textsuperscript24, M. Zeinali INFN Sezione di Bari , Università di Bari , Politecnico di Bari , Bari, Italy
M. Abbrescia, L. Barbone, C. Calabria\@textsuperscript5, S.S. Chhibra, A. Colaleo, D. Creanza, N. De Filippis\@textsuperscript5, M. De Palma, L. Fiore, G. Iaselli, L. Lusito, G. Maggi, M. Maggi, B. Marangelli, S. My, S. Nuzzo, N. Pacifico, A. Pompili, G. Pugliese, G. Selvaggi, L. Silvestris, G. Singh, R. Venditti, G. Zito INFN Sezione di Bologna , Università di Bologna , Bologna, Italy
G. Abbiendi, A.C. Benvenuti, D. Bonacorsi, S. Braibant-Giacomelli, L. Brigliadori, P. Capiluppi, A. Castro, F.R. Cavallo, M. Cuffiani, G.M. Dallavalle, F. Fabbri, A. Fanfani, D. Fasanella\@textsuperscript5, P. Giacomelli, C. Grandi, L. Guiducci, S. Marcellini, G. Masetti, M. Meneghelli\@textsuperscript5, A. Montanari, F.L. Navarria, F. Odorici, A. Perrotta, F. Primavera, A.M. Rossi, T. Rovelli, G.P. Siroli, R. Travaglini INFN Sezione di Catania , Università di Catania , Catania, Italy
S. Albergo, G. Cappello, M. Chiorboli, S. Costa, R. Potenza, A. Tricomi, C. Tuve INFN Sezione di Firenze , Università di Firenze , Firenze, Italy
G. Barbagli, V. Ciulli, C. Civinini, R. D’Alessandro, E. Focardi, S. Frosali, E. Gallo, S. Gonzi, M. Meschini, S. Paoletti, G. Sguazzoni, A. Tropiano INFN Laboratori Nazionali di Frascati, Frascati, Italy
L. Benussi, S. Bianco, S. Colafranceschi\@textsuperscript25, F. Fabbri, D. Piccolo INFN Sezione di Genova , Università di Genova , Genova, Italy
P. Fabbricatore, R. Musenich, S. Tosi INFN Sezione di Milano-Bicocca , Università di Milano-Bicocca , Milano, Italy
A. Benaglia, F. De Guio, L. Di Matteo\@textsuperscript5, S. Fiorendi, S. Gennai\@textsuperscript5, A. Ghezzi, S. Malvezzi, R.A. Manzoni, A. Martelli, A. Massironi\@textsuperscript5, D. Menasce, L. Moroni, M. Paganoni, D. Pedrini, S. Ragazzi, N. Redaelli, S. Sala, T. Tabarelli de Fatis INFN Sezione di Napoli , Università di Napoli ”Federico II” , Napoli, Italy
S. Buontempo, C.A. Carrillo Montoya, N. Cavallo\@textsuperscript26, A. De Cosa\@textsuperscript5, O. Dogangun, F. Fabozzi\@textsuperscript26, A.O.M. Iorio, L. Lista, S. Meola\@textsuperscript27, M. Merola, P. Paolucci\@textsuperscript5 INFN Sezione di Padova , Università di Padova , Università di Trento (Trento) , Padova, Italy
P. Azzi, N. Bacchetta\@textsuperscript5, D. Bisello, A. Branca\@textsuperscript5, R. Carlin, P. Checchia, T. Dorigo, U. Dosselli, F. Gasparini, U. Gasparini, A. Gozzelino, K. Kanishchev, S. Lacaprara, I. Lazzizzera, M. Margoni, A.T. Meneguzzo, J. Pazzini, N. Pozzobon, P. Ronchese, F. Simonetto, E. Torassa, M. Tosi\@textsuperscript5, S. Vanini, P. Zotto, G. Zumerle INFN Sezione di Pavia , Università di Pavia , Pavia, Italy
M. Gabusi, S.P. Ratti, C. Riccardi, P. Torre, P. Vitulo INFN Sezione di Perugia , Università di Perugia , Perugia, Italy
M. Biasini, G.M. Bilei, L. Fanò, P. Lariccia, G. Mantovani, M. Menichelli, A. Nappi, F. Romeo, A. Saha, A. Santocchia, A. Spiezia, S. Taroni INFN Sezione di Pisa , Università di Pisa , Scuola Normale Superiore di Pisa , Pisa, Italy
P. Azzurri, G. Bagliesi, J. Bernardini, T. Boccali, G. Broccolo, R. Castaldi, R.T. D’Agnolo\@textsuperscript5, R. Dell’Orso, F. Fiori\@textsuperscript5, L. Foà, A. Giassi, A. Kraan, F. Ligabue, T. Lomtadze, L. Martini\@textsuperscript28, A. Messineo, F. Palla, A. Rizzi, A.T. Serban\@textsuperscript29, P. Spagnolo, P. Squillacioti\@textsuperscript5, R. Tenchini, G. Tonelli, A. Venturi, P.G. Verdini INFN Sezione di Roma , Università di Roma , Roma, Italy
L. Barone, F. Cavallari, D. Del Re, M. Diemoz, C. Fanelli, M. Grassi\@textsuperscript5, E. Longo, P. Meridiani\@textsuperscript5, F. Micheli, S. Nourbakhsh, G. Organtini, R. Paramatti, S. Rahatlou, M. Sigamani, L. Soffi INFN Sezione di Torino , Università di Torino , Università del Piemonte Orientale (Novara) , Torino, Italy
N. Amapane, R. Arcidiacono, S. Argiro, M. Arneodo, C. Biino, N. Cartiglia, M. Costa, N. Demaria, C. Mariotti\@textsuperscript5, S. Maselli, E. Migliore, V. Monaco, M. Musich\@textsuperscript5, M.M. Obertino, N. Pastrone, M. Pelliccioni, A. Potenza, A. Romero, R. Sacchi, A. Solano, A. Staiano, A. Vilela Pereira, L. Visca INFN Sezione di Trieste , Università di Trieste , Trieste, Italy
S. Belforte, V. Candelise, M. Casarsa, F. Cossutti, G. Della Ricca, B. Gobbo, M. Marone\@textsuperscript5, D. Montanino\@textsuperscript5, A. Penzo, A. Schizzi Kangwon National University, Chunchon, Korea
S.G. Heo, T.Y. Kim, S.K. Nam Kyungpook National University, Daegu, Korea
S. Chang, D.H. Kim, G.N. Kim, D.J. Kong, H. Park, S.R. Ro, D.C. Son, T. Son Chonnam National University, Institute for Universe and Elementary Particles, Kwangju, Korea
J.Y. Kim, Zero J. Kim, S. Song Korea University, Seoul, Korea
S. Choi, D. Gyun, B. Hong, M. Jo, H. Kim, T.J. Kim, K.S. Lee, D.H. Moon, S.K. Park University of Seoul, Seoul, Korea
M. Choi, J.H. Kim, C. Park, I.C. Park, S. Park, G. Ryu Sungkyunkwan University, Suwon, Korea
Y. Cho, Y. Choi, Y.K. Choi, J. Goh, M.S. Kim, E. Kwon, B. Lee, J. Lee, S. Lee, H. Seo, I. Yu Vilnius University, Vilnius, Lithuania
M.J. Bilinskas, I. Grigelionis, M. Janulis, A. Juodagalvis Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, Mexico
H. Castilla-Valdez, E. De La Cruz-Burelo, I. Heredia-de La Cruz, R. Lopez-Fernandez, R. Magaña Villalba, J. Martínez-Ortega, A. Sánchez-Hernández, L.M. Villasenor-Cendejas Universidad Iberoamericana, Mexico City, Mexico
S. Carrillo Moreno, F. Vazquez Valencia Benemerita Universidad Autonoma de Puebla, Puebla, Mexico
H.A. Salazar Ibarguen Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
E. Casimiro Linares, A. Morelos Pineda, M.A. Reyes-Santos University of Auckland, Auckland, New Zealand
D. Krofcheck University of Canterbury, Christchurch, New Zealand
A.J. Bell, P.H. Butler, R. Doesburg, S. Reucroft, H. Silverwood National Centre for Physics, Quaid-I-Azam University, Islamabad, Pakistan
M. Ahmad, M.H. Ansari, M.I. Asghar, H.R. Hoorani, S. Khalid, W.A. Khan, T. Khurshid, S. Qazi, M.A. Shah, M. Shoaib National Centre for Nuclear Research, Swierk, Poland
H. Bialkowska, B. Boimska, T. Frueboes, R. Gokieli, M. Górski, M. Kazana, K. Nawrocki, K. Romanowska-Rybinska, M. Szleper, G. Wrochna, P. Zalewski Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
G. Brona, K. Bunkowski, M. Cwiok, W. Dominik, K. Doroba, A. Kalinowski, M. Konecki, J. Krolikowski Laboratório de Instrumentação e Física Experimental de Partículas, Lisboa, Portugal
N. Almeida, P. Bargassa, A. David, P. Faccioli, P.G. Ferreira Parracho, M. Gallinaro, J. Seixas, J. Varela, P. Vischia Joint Institute for Nuclear Research, Dubna, Russia
I. Belotelov, I. Golutvin, I. Gorbunov, A. Kamenev, V. Karjavin, V. Konoplyanikov, G. Kozlov, A. Lanev, A. Malakhov, P. Moisenz, V. Palichik, V. Perelygin, M. Savina, S. Shmatov, V. Smirnov, A. Volodko, A. Zarubin Petersburg Nuclear Physics Institute, Gatchina (St. Petersburg), Russia
S. Evstyukhin, V. Golovtsov, Y. Ivanov, V. Kim, P. Levchenko, V. Murzin, V. Oreshkin, I. Smirnov, V. Sulimov, L. Uvarov, S. Vavilov, A. Vorobyev, An. Vorobyev Institute for Nuclear Research, Moscow, Russia
Yu. Andreev, A. Dermenev, S. Gninenko, N. Golubev, M. Kirsanov, N. Krasnikov, V. Matveev, A. Pashenkov, D. Tlisov, A. Toropin Institute for Theoretical and Experimental Physics, Moscow, Russia
V. Epshteyn, M. Erofeeva, V. Gavrilov, M. Kossov, N. Lychkovskaya, V. Popov, G. Safronov, S. Semenov, V. Stolin, E. Vlasov, A. Zhokin Moscow State University, Moscow, Russia
A. Belyaev, E. Boos, M. Dubinin\@textsuperscript4, L. Dudko, A. Ershov, A. Gribushin, V. Klyukhin, O. Kodolova, I. Lokhtin, A. Markina, S. Obraztsov, M. Perfilov, S. Petrushanko, A. Popov, L. Sarycheva, V. Savrin, A. Snigirev P.N. Lebedev Physical Institute, Moscow, Russia
V. Andreev, M. Azarkin, I. Dremin, M. Kirakosyan, A. Leonidov, G. Mesyats, S.V. Rusakov, A. Vinogradov State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, Russia
I. Azhgirey, I. Bayshev, S. Bitioukov, V. Grishin\@textsuperscript5, V. Kachanov, D. Konstantinov, V. Krychkine, V. Petrov, R. Ryutin, A. Sobol, L. Tourtchanovitch, S. Troshin, N. Tyurin, A. Uzunian, A. Volkov University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia
P. Adzic\@textsuperscript30, M. Djordjevic, M. Ekmedzic, D. Krpic\@textsuperscript30, J. Milosevic Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
M. Aguilar-Benitez, J. Alcaraz Maestre, P. Arce, C. Battilana, E. Calvo, M. Cerrada, M. Chamizo Llatas, N. Colino, B. De La Cruz, A. Delgado Peris, D. Domínguez Vázquez, C. Fernandez Bedoya, J.P. Fernández Ramos, A. Ferrando, J. Flix, M.C. Fouz, P. Garcia-Abia, O. Gonzalez Lopez, S. Goy Lopez, J.M. Hernandez, M.I. Josa, G. Merino, J. Puerta Pelayo, A. Quintario Olmeda, I. Redondo, L. Romero, J. Santaolalla, M.S. Soares, C. Willmott Universidad Autónoma de Madrid, Madrid, Spain
C. Albajar, G. Codispoti, J.F. de Trocóniz Universidad de Oviedo, Oviedo, Spain
H. Brun, J. Cuevas, J. Fernandez Menendez, S. Folgueras, I. Gonzalez Caballero, L. Lloret Iglesias, J. Piedra Gomez Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, Spain
J.A. Brochero Cifuentes, I.J. Cabrillo, A. Calderon, S.H. Chuang, J. Duarte Campderros, M. Felcini\@textsuperscript31, M. Fernandez, G. Gomez, J. Gonzalez Sanchez, A. Graziano, C. Jorda, A. Lopez Virto, J. Marco, R. Marco, C. Martinez Rivero, F. Matorras, F.J. Munoz Sanchez, T. Rodrigo, A.Y. Rodríguez-Marrero, A. Ruiz-Jimeno, L. Scodellaro, I. Vila, R. Vilar Cortabitarte CERN, European Organization for Nuclear Research, Geneva, Switzerland
D. Abbaneo, E. Auffray, G. Auzinger, M. Bachtis, P. Baillon, A.H. Ball, D. Barney, J.F. Benitez, C. Bernet\@textsuperscript6, G. Bianchi, P. Bloch, A. Bocci, A. Bonato, C. Botta, H. Breuker, T. Camporesi, G. Cerminara, T. Christiansen, J.A. Coarasa Perez, D. D’Enterria, A. Dabrowski, A. De Roeck, S. Di Guida, M. Dobson, N. Dupont-Sagorin, A. Elliott-Peisert, B. Frisch, W. Funk, G. Georgiou, M. Giffels, D. Gigi, K. Gill, D. Giordano, M. Girone, M. Giunta, F. Glege, R. Gomez-Reino Garrido, P. Govoni, S. Gowdy, R. Guida, M. Hansen, P. Harris, C. Hartl, J. Harvey, B. Hegner, A. Hinzmann, V. Innocente, P. Janot, K. Kaadze, E. Karavakis, K. Kousouris, P. Lecoq, Y.-J. Lee, P. Lenzi, C. Lourenço, N. Magini, T. Mäki, M. Malberti, L. Malgeri, M. Mannelli, L. Masetti, F. Meijers, S. Mersi, E. Meschi, R. Moser, M.U. Mozer, M. Mulders, P. Musella, E. Nesvold, T. Orimoto, L. Orsini, E. Palencia Cortezon, E. Perez, L. Perrozzi, A. Petrilli, A. Pfeiffer, M. Pierini, M. Pimiä, D. Piparo, G. Polese, L. Quertenmont, A. Racz, W. Reece, J. Rodrigues Antunes, G. Rolandi\@textsuperscript32, C. Rovelli\@textsuperscript33, M. Rovere, H. Sakulin, F. Santanastasio, C. Schäfer, C. Schwick, I. Segoni, S. Sekmen, A. Sharma, P. Siegrist, P. Silva, M. Simon, P. Sphicas\@textsuperscript34, D. Spiga, A. Tsirou, G.I. Veres\@textsuperscript19, J.R. Vlimant, H.K. Wöhri, S.D. Worm\@textsuperscript35, W.D. Zeuner Paul Scherrer Institut, Villigen, Switzerland
W. Bertl, K. Deiters, W. Erdmann, K. Gabathuler, R. Horisberger, Q. Ingram, H.C. Kaestli, S. König, D. Kotlinski, U. Langenegger, F. Meier, D. Renker, T. Rohe, J. Sibille\@textsuperscript36 Institute for Particle Physics, ETH Zurich, Zurich, Switzerland
L. Bäni, P. Bortignon, M.A. Buchmann, B. Casal, N. Chanon, A. Deisher, G. Dissertori, M. Dittmar, M. Donegà, M. Dünser, J. Eugster, K. Freudenreich, C. Grab, D. Hits, P. Lecomte, W. Lustermann, A.C. Marini, P. Martinez Ruiz del Arbol, N. Mohr, F. Moortgat, C. Nägeli\@textsuperscript37, P. Nef, F. Nessi-Tedaldi, F. Pandolfi, L. Pape, F. Pauss, M. Peruzzi, F.J. Ronga, M. Rossini, L. Sala, A.K. Sanchez, A. Starodumov\@textsuperscript38, B. Stieger, M. Takahashi, L. Tauscher, A. Thea, K. Theofilatos, D. Treille, C. Urscheler, R. Wallny, H.A. Weber, L. Wehrli Universität Zürich, Zurich, Switzerland
C. Amsler, V. Chiochia, S. De Visscher, C. Favaro, M. Ivova Rikova, B. Millan Mejias, P. Otiougova, P. Robmann, H. Snoek, S. Tupputi, M. Verzetti National Central University, Chung-Li, Taiwan
S. Bahinipati, Y.H. Chang, K.H. Chen, C.M. Kuo, S.W. Li, W. Lin, Z.K. Liu, Y.J. Lu, D. Mekterovic, A.P. Singh, R. Volpe, S.S. Yu National Taiwan University (NTU), Taipei, Taiwan
P. Bartalini, P. Chang, Y.H. Chang, Y.W. Chang, Y. Chao, K.F. Chen, C. Dietz, U. Grundler, W.-S. Hou, Y. Hsiung, K.Y. Kao, Y.J. Lei, R.-S. Lu, D. Majumder, E. Petrakou, X. Shi, J.G. Shiu, Y.M. Tzeng, X. Wan, M. Wang Chulalongkorn University, Bangkok, Thailand
B. Asavapibhop, N. Srimanobhas Cukurova University, Adana, Turkey
A. Adiguzel, M.N. Bakirci\@textsuperscript39, S. Cerci\@textsuperscript40, C. Dozen, I. Dumanoglu, E. Eskut, S. Girgis, G. Gokbulut, E. Gurpinar, I. Hos, E.E. Kangal, T. Karaman, G. Karapinar\@textsuperscript41, A. Kayis Topaksu, G. Onengut, K. Ozdemir, S. Ozturk\@textsuperscript42, A. Polatoz, K. Sogut\@textsuperscript43, D. Sunar Cerci\@textsuperscript40, B. Tali\@textsuperscript40, H. Topakli\@textsuperscript39, L.N. Vergili, M. Vergili Middle East Technical University, Physics Department, Ankara, Turkey
I.V. Akin, T. Aliev, B. Bilin, S. Bilmis, M. Deniz, H. Gamsizkan, A.M. Guler, K. Ocalan, A. Ozpineci, M. Serin, R. Sever, U.E. Surat, M. Yalvac, E. Yildirim, M. Zeyrek Bogazici University, Istanbul, Turkey
E. Gülmez, B. Isildak\@textsuperscript44, M. Kaya\@textsuperscript45, O. Kaya\@textsuperscript45, S. Ozkorucuklu\@textsuperscript46, N. Sonmez\@textsuperscript47 Istanbul Technical University, Istanbul, Turkey
K. Cankocak National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, Ukraine
L. Levchuk University of Bristol, Bristol, United Kingdom
F. Bostock, J.J. Brooke, E. Clement, D. Cussans, H. Flacher, R. Frazier, J. Goldstein, M. Grimes, G.P. Heath, H.F. Heath, L. Kreczko, S. Metson, D.M. Newbold\@textsuperscript35, K. Nirunpong, A. Poll, S. Senkin, V.J. Smith, T. Williams Rutherford Appleton Laboratory, Didcot, United Kingdom
L. Basso\@textsuperscript48, K.W. Bell, A. Belyaev\@textsuperscript48, C. Brew, R.M. Brown, D.J.A. Cockerill, J.A. Coughlan, K. Harder, S. Harper, J. Jackson, B.W. Kennedy, E. Olaiya, D. Petyt, B.C. Radburn-Smith, C.H. Shepherd-Themistocleous, I.R. Tomalin, W.J. Womersley Imperial College, London, United Kingdom
R. Bainbridge, G. Ball, R. Beuselinck, O. Buchmuller, D. Colling, N. Cripps, M. Cutajar, P. Dauncey, G. Davies, M. Della Negra, W. Ferguson, J. Fulcher, D. Futyan, A. Gilbert, A. Guneratne Bryer, G. Hall, Z. Hatherell, J. Hays, G. Iles, M. Jarvis, G. Karapostoli, L. Lyons, A.-M. Magnan, J. Marrouche, B. Mathias, R. Nandi, J. Nash, A. Nikitenko\@textsuperscript38, A. Papageorgiou, J. Pela, M. Pesaresi, K. Petridis, M. Pioppi\@textsuperscript49, D.M. Raymond, S. Rogerson, A. Rose, M.J. Ryan, C. Seez, P. Sharp, A. Sparrow, M. Stoye, A. Tapper, M. Vazquez Acosta, T. Virdee, S. Wakefield, N. Wardle, T. Whyntie Brunel University, Uxbridge, United Kingdom
M. Chadwick, J.E. Cole, P.R. Hobson, A. Khan, P. Kyberd, D. Leggat, D. Leslie, W. Martin, I.D. Reid, P. Symonds, L. Teodorescu, M. Turner Baylor University, Waco, USA
K. Hatakeyama, H. Liu, T. Scarborough The University of Alabama, Tuscaloosa, USA
O. Charaf, C. Henderson, P. Rumerio Boston University, Boston, USA
A. Avetisyan, T. Bose, C. Fantasia, A. Heister, J. St. John, P. Lawson, D. Lazic, J. Rohlf, D. Sperka, L. Sulak Brown University, Providence, USA
J. Alimena, S. Bhattacharya, D. Cutts, A. Ferapontov, U. Heintz, S. Jabeen, G. Kukartsev, E. Laird, G. Landsberg, M. Luk, M. Narain, D. Nguyen, M. Segala, T. Sinthuprasith, T. Speer, K.V. Tsang University of California, Davis, Davis, USA
R. Breedon, G. Breto, M. Calderon De La Barca Sanchez, S. Chauhan, M. Chertok, J. Conway, R. Conway, P.T. Cox, J. Dolen, R. Erbacher, M. Gardner, R. Houtz, W. Ko, A. Kopecky, R. Lander, O. Mall, T. Miceli, D. Pellett, F. Ricci-tam, B. Rutherford, M. Searle, J. Smith, M. Squires, M. Tripathi, R. Vasquez Sierra University of California, Los Angeles, Los Angeles, USA
V. Andreev, D. Cline, R. Cousins, J. Duris, S. Erhan, P. Everaerts, C. Farrell, J. Hauser, M. Ignatenko, C. Jarvis, C. Plager, G. Rakness, P. Schlein, P. Traczyk, V. Valuev, M. Weber University of California, Riverside, Riverside, USA
J. Babb, R. Clare, M.E. Dinardo, J. Ellison, J.W. Gary, F. Giordano, G. Hanson, G.Y. Jeng\@textsuperscript50, H. Liu, O.R. Long, A. Luthra, H. Nguyen, S. Paramesvaran, J. Sturdy, S. Sumowidagdo, R. Wilken, S. Wimpenny University of California, San Diego, La Jolla, USA
W. Andrews, J.G. Branson, G.B. Cerati, S. Cittolin, D. Evans, F. Golf, A. Holzner, R. Kelley, M. Lebourgeois, J. Letts, I. Macneill, B. Mangano, S. Padhi, C. Palmer, G. Petrucciani, M. Pieri, M. Sani, V. Sharma, S. Simon, E. Sudano, M. Tadel, Y. Tu, A. Vartak, S. Wasserbaech\@textsuperscript51, F. Würthwein, A. Yagil, J. Yoo University of California, Santa Barbara, Santa Barbara, USA
D. Barge, R. Bellan, C. Campagnari, M. D’Alfonso, T. Danielson, K. Flowers, P. Geffert, J. Incandela, C. Justus, P. Kalavase, S.A. Koay, D. Kovalskyi, V. Krutelyov, S. Lowette, N. Mccoll, V. Pavlunin, F. Rebassoo, J. Ribnik, J. Richman, R. Rossin, D. Stuart, W. To, C. West California Institute of Technology, Pasadena, USA
A. Apresyan, A. Bornheim, Y. Chen, E. Di Marco, J. Duarte, M. Gataullin, Y. Ma, A. Mott, H.B. Newman, C. Rogan, M. Spiropulu, V. Timciuc, J. Veverka, R. Wilkinson, S. Xie, Y. Yang, R.Y. Zhu Carnegie Mellon University, Pittsburgh, USA
B. Akgun, V. Azzolini, A. Calamba, R. Carroll, T. Ferguson, Y. Iiyama, D.W. Jang, Y.F. Liu, M. Paulini, H. Vogel, I. Vorobiev University of Colorado at Boulder, Boulder, USA
J.P. Cumalat, B.R. Drell, W.T. Ford, A. Gaz, E. Luiggi Lopez, J.G. Smith, K. Stenson, K.A. Ulmer, S.R. Wagner Cornell University, Ithaca, USA
J. Alexander, A. Chatterjee, N. Eggert, L.K. Gibbons, B. Heltsley, A. Khukhunaishvili, B. Kreis, N. Mirman, G. Nicolas Kaufman, J.R. Patterson, A. Ryd, E. Salvati, W. Sun, W.D. Teo, J. Thom, J. Thompson, J. Tucker, J. Vaughan, Y. Weng, L. Winstrom, P. Wittich Fairfield University, Fairfield, USA
D. Winn Fermi National Accelerator Laboratory, Batavia, USA
S. Abdullin, M. Albrow, J. Anderson, L.A.T. Bauerdick, A. Beretvas, J. Berryhill, P.C. Bhat, I. Bloch, K. Burkett, J.N. Butler, V. Chetluru, H.W.K. Cheung, F. Chlebana, V.D. Elvira, I. Fisk, J. Freeman, Y. Gao, D. Green, O. Gutsche, J. Hanlon, R.M. Harris, J. Hirschauer, B. Hooberman, S. Jindariani, M. Johnson, U. Joshi, B. Kilminster, B. Klima, S. Kunori, S. Kwan, C. Leonidopoulos, J. Linacre, D. Lincoln, R. Lipton, J. Lykken, K. Maeshima, J.M. Marraffino, S. Maruyama, D. Mason, P. McBride, K. Mishra, S. Mrenna, Y. Musienko\@textsuperscript52, C. Newman-Holmes, V. O’Dell, O. Prokofyev, E. Sexton-Kennedy, S. Sharma, W.J. Spalding, L. Spiegel, L. Taylor, S. Tkaczyk, N.V. Tran, L. Uplegger, E.W. Vaandering, R. Vidal, J. Whitmore, W. Wu, F. Yang, F. Yumiceva, J.C. Yun University of Florida, Gainesville, USA
D. Acosta, P. Avery, D. Bourilkov, M. Chen, T. Cheng, S. Das, M. De Gruttola, G.P. Di Giovanni, D. Dobur, A. Drozdetskiy, R.D. Field, M. Fisher, Y. Fu, I.K. Furic, J. Gartner, J. Hugon, B. Kim, J. Konigsberg, A. Korytov, A. Kropivnitskaya, T. Kypreos, J.F. Low, K. Matchev, P. Milenovic\@textsuperscript53, G. Mitselmakher, L. Muniz, M. Park, R. Remington, A. Rinkevicius, P. Sellers, N. Skhirtladze, M. Snowball, J. Yelton, M. Zakaria Florida International University, Miami, USA
V. Gaultney, S. Hewamanage, L.M. Lebolo, S. Linn, P. Markowitz, G. Martinez, J.L. Rodriguez Florida State University, Tallahassee, USA
T. Adams, A. Askew, J. Bochenek, J. Chen, B. Diamond, S.V. Gleyzer, J. Haas, S. Hagopian, V. Hagopian, M. Jenkins, K.F. Johnson, H. Prosper, V. Veeraraghavan, M. Weinberg Florida Institute of Technology, Melbourne, USA
M.M. Baarmand, B. Dorney, M. Hohlmann, H. Kalakhety, I. Vodopiyanov University of Illinois at Chicago (UIC), Chicago, USA
M.R. Adams, I.M. Anghel, L. Apanasevich, Y. Bai, V.E. Bazterra, R.R. Betts, I. Bucinskaite, J. Callner, R. Cavanaugh, O. Evdokimov, L. Gauthier, C.E. Gerber, D.J. Hofman, S. Khalatyan, F. Lacroix, M. Malek, C. O’Brien, C. Silkworth, D. Strom, P. Turner, N. Varelas The University of Iowa, Iowa City, USA
U. Akgun, E.A. Albayrak, B. Bilki\@textsuperscript54, W. Clarida, F. Duru, S. Griffiths, J.-P. Merlo, H. Mermerkaya\@textsuperscript55, A. Mestvirishvili, A. Moeller, J. Nachtman, C.R. Newsom, E. Norbeck, Y. Onel, F. Ozok\@textsuperscript56, S. Sen, P. Tan, E. Tiras, J. Wetzel, T. Yetkin, K. Yi Johns Hopkins University, Baltimore, USA
B.A. Barnett, B. Blumenfeld, S. Bolognesi, D. Fehling, G. Giurgiu, A.V. Gritsan, Z.J. Guo, G. Hu, P. Maksimovic, S. Rappoccio, M. Swartz, A. Whitbeck The University of Kansas, Lawrence, USA
P. Baringer, A. Bean, G. Benelli, R.P. Kenny Iii, M. Murray, D. Noonan, S. Sanders, R. Stringer, G. Tinti, J.S. Wood, V. Zhukova Kansas State University, Manhattan, USA
A.F. Barfuss, T. Bolton, I. Chakaberia, A. Ivanov, S. Khalil, M. Makouski, Y. Maravin, S. Shrestha, I. Svintradze Lawrence Livermore National Laboratory, Livermore, USA
J. Gronberg, D. Lange, D. Wright University of Maryland, College Park, USA
A. Baden, M. Boutemeur, B. Calvert, S.C. Eno, J.A. Gomez, N.J. Hadley, R.G. Kellogg, M. Kirn, T. Kolberg, Y. Lu, M. Marionneau, A.C. Mignerey, K. Pedro, A. Peterman, A. Skuja, J. Temple, M.B. Tonjes, S.C. Tonwar, E. Twedt Massachusetts Institute of Technology, Cambridge, USA
A. Apyan, G. Bauer, J. Bendavid, W. Busza, E. Butz, I.A. Cali, M. Chan, V. Dutta, G. Gomez Ceballos, M. Goncharov, K.A. Hahn, Y. Kim, M. Klute, K. Krajczar\@textsuperscript57, P.D. Luckey, T. Ma, S. Nahn, C. Paus, D. Ralph, C. Roland, G. Roland, M. Rudolph, G.S.F. Stephans, F. Stöckli, K. Sumorok, K. Sung, D. Velicanu, E.A. Wenger, R. Wolf, B. Wyslouch, M. Yang, Y. Yilmaz, A.S. Yoon, M. Zanetti University of Minnesota, Minneapolis, USA
S.I. Cooper, B. Dahmes, A. De Benedetti, G. Franzoni, A. Gude, S.C. Kao, K. Klapoetke, Y. Kubota, J. Mans, N. Pastika, R. Rusack, M. Sasseville, A. Singovsky, N. Tambe, J. Turkewitz University of Mississippi, Oxford, USA
L.M. Cremaldi, R. Kroeger, L. Perera, R. Rahmat, D.A. Sanders University of Nebraska-Lincoln, Lincoln, USA
E. Avdeeva, K. Bloom, S. Bose, J. Butt, D.R. Claes, A. Dominguez, M. Eads, J. Keller, I. Kravchenko, J. Lazo-Flores, H. Malbouisson, S. Malik, G.R. Snow State University of New York at Buffalo, Buffalo, USA
U. Baur, A. Godshalk, I. Iashvili, S. Jain, A. Kharchilava, A. Kumar, S.P. Shipkowski, K. Smith Northeastern University, Boston, USA
G. Alverson, E. Barberis, D. Baumgartel, M. Chasco, J. Haley, D. Nash, D. Trocino, D. Wood, J. Zhang Northwestern University, Evanston, USA
A. Anastassov, A. Kubik, N. Mucia, N. Odell, R.A. Ofierzynski, B. Pollack, A. Pozdnyakov, M. Schmitt, S. Stoynev, M. Velasco, S. Won University of Notre Dame, Notre Dame, USA
L. Antonelli, D. Berry, A. Brinkerhoff, K.M. Chan, M. Hildreth, C. Jessop, D.J. Karmgard, J. Kolb, K. Lannon, W. Luo, S. Lynch, N. Marinelli, D.M. Morse, T. Pearson, M. Planer, R. Ruchti, J. Slaunwhite, N. Valls, M. Wayne, M. Wolf The Ohio State University, Columbus, USA
B. Bylsma, L.S. Durkin, C. Hill, R. Hughes, K. Kotov, T.Y. Ling, D. Puigh, M. Rodenburg, C. Vuosalo, G. Williams, B.L. Winer Princeton University, Princeton, USA
N. Adam, E. Berry, P. Elmer, D. Gerbaudo, V. Halyo, P. Hebda, J. Hegeman, A. Hunt, P. Jindal, D. Lopes Pegna, P. Lujan, D. Marlow, T. Medvedeva, M. Mooney, J. Olsen, P. Piroué, X. Quan, A. Raval, B. Safdi, H. Saka, D. Stickland, C. Tully, J.S. Werner, A. Zuranski University of Puerto Rico, Mayaguez, USA
E. Brownson, A. Lopez, H. Mendez, J.E. Ramirez Vargas Purdue University, West Lafayette, USA
E. Alagoz, V.E. Barnes, D. Benedetti, G. Bolla, D. Bortoletto, M. De Mattia, A. Everett, Z. Hu, M. Jones, O. Koybasi, M. Kress, A.T. Laasanen, N. Leonardo, V. Maroussov, P. Merkel, D.H. Miller, N. Neumeister, I. Shipsey, D. Silvers, A. Svyatkovskiy, M. Vidal Marono, H.D. Yoo, J. Zablocki, Y. Zheng Purdue University Calumet, Hammond, USA
S. Guragain, N. Parashar Rice University, Houston, USA
A. Adair, C. Boulahouache, K.M. Ecklund, F.J.M. Geurts, W. Li, B.P. Padley, R. Redjimi, J. Roberts, J. Zabel University of Rochester, Rochester, USA
B. Betchart, A. Bodek, Y.S. Chung, R. Covarelli, P. de Barbaro, R. Demina, Y. Eshaq, T. Ferbel, A. Garcia-Bellido, P. Goldenzweig, J. Han, A. Harel, D.C. Miner, D. Vishnevskiy, M. Zielinski The Rockefeller University, New York, USA
A. Bhatti, R. Ciesielski, L. Demortier, K. Goulianos, G. Lungu, S. Malik, C. Mesropian Rutgers, the State University of New Jersey, Piscataway, USA
S. Arora, A. Barker, J.P. Chou, C. Contreras-Campana, E. Contreras-Campana, D. Duggan, D. Ferencek, Y. Gershtein, R. Gray, E. Halkiadakis, D. Hidas, A. Lath, S. Panwalkar, M. Park, R. Patel, V. Rekovic, J. Robles, K. Rose, S. Salur, S. Schnetzer, C. Seitz, S. Somalwar, R. Stone, S. Thomas University of Tennessee, Knoxville, USA
G. Cerizza, M. Hollingsworth, S. Spanier, Z.C. Yang, A. York Texas A&M University, College Station, USA
R. Eusebi, W. Flanagan, J. Gilmore, T. Kamon\@textsuperscript58, V. Khotilovich, R. Montalvo, I. Osipenkov, Y. Pakhotin, A. Perloff, J. Roe, A. Safonov, T. Sakuma, S. Sengupta, I. Suarez, A. Tatarinov, D. Toback Texas Tech University, Lubbock, USA
N. Akchurin, J. Damgov, C. Dragoiu, P.R. Dudero, C. Jeong, K. Kovitanggoon, S.W. Lee, T. Libeiro, Y. Roh, I. Volobouev Vanderbilt University, Nashville, USA
E. Appelt, A.G. Delannoy, C. Florez, S. Greene, A. Gurrola, W. Johns, C. Johnston, P. Kurt, C. Maguire, A. Melo, M. Sharma, P. Sheldon, B. Snook, S. Tuo, J. Velkovska University of Virginia, Charlottesville, USA
M.W. Arenton, M. Balazs, S. Boutle, B. Cox, B. Francis, J. Goodell, R. Hirosky, A. Ledovskoy, C. Lin, C. Neu, J. Wood, R. Yohay Wayne State University, Detroit, USA
S. Gollapinni, R. Harr, P.E. Karchin, C. Kottachchi Kankanamge Don, P. Lamichhane, A. Sakharov University of Wisconsin, Madison, USA
M. Anderson, D. Belknap, L. Borrello, D. Carlsmith, M. Cepeda, S. Dasu, E. Friis, L. Gray, K.S. Grogg, M. Grothe, R. Hall-Wilton, M. Herndon, A. Hervé, P. Klabbers, J. Klukas, A. Lanaro, C. Lazaridis, J. Leonard, R. Loveless, A. Mohapatra, I. Ojalvo, F. Palmonari, G.A. Pierro, I. Ross, A. Savin, W.H. Smith, J. Swanson †: Deceased
1: Also at Vienna University of Technology, Vienna, Austria
2: Also at National Institute of Chemical Physics and Biophysics, Tallinn, Estonia
3: Also at Universidade Federal do ABC, Santo Andre, Brazil
4: Also at California Institute of Technology, Pasadena, USA
5: Also at CERN, European Organization for Nuclear Research, Geneva, Switzerland
6: Also at Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France
7: Also at Suez Canal University, Suez, Egypt
8: Also at Zewail City of Science and Technology, Zewail, Egypt
9: Also at Cairo University, Cairo, Egypt
10: Also at Fayoum University, El-Fayoum, Egypt
11: Also at British University, Cairo, Egypt
12: Now at Ain Shams University, Cairo, Egypt
13: Also at National Centre for Nuclear Research, Swierk, Poland
14: Also at Université de Haute-Alsace, Mulhouse, France
15: Now at Joint Institute for Nuclear Research, Dubna, Russia
16: Also at Moscow State University, Moscow, Russia
17: Also at Brandenburg University of Technology, Cottbus, Germany
18: Also at Institute of Nuclear Research ATOMKI, Debrecen, Hungary
19: Also at Eötvös Loránd University, Budapest, Hungary
20: Also at Tata Institute of Fundamental Research - HECR, Mumbai, India
21: Also at University of Visva-Bharati, Santiniketan, India
22: Also at Sharif University of Technology, Tehran, Iran
23: Also at Isfahan University of Technology, Isfahan, Iran
24: Also at Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran
25: Also at Facoltà Ingegneria Università di Roma, Roma, Italy
26: Also at Università della Basilicata, Potenza, Italy
27: Also at Università degli Studi Guglielmo Marconi, Roma, Italy
28: Also at Università degli Studi di Siena, Siena, Italy
29: Also at University of Bucharest, Faculty of Physics, Bucuresti-Magurele, Romania
30: Also at Faculty of Physics of University of Belgrade, Belgrade, Serbia
31: Also at University of California, Los Angeles, Los Angeles, USA
32: Also at Scuola Normale e Sezione dell’ INFN, Pisa, Italy
33: Also at INFN Sezione di Roma; Università di Roma, Roma, Italy
34: Also at University of Athens, Athens, Greece
35: Also at Rutherford Appleton Laboratory, Didcot, United Kingdom
36: Also at The University of Kansas, Lawrence, USA
37: Also at Paul Scherrer Institut, Villigen, Switzerland
38: Also at Institute for Theoretical and Experimental Physics, Moscow, Russia
39: Also at Gaziosmanpasa University, Tokat, Turkey
40: Also at Adiyaman University, Adiyaman, Turkey
41: Also at Izmir Institute of Technology, Izmir, Turkey
42: Also at The University of Iowa, Iowa City, USA
43: Also at Mersin University, Mersin, Turkey
44: Also at Ozyegin University, Istanbul, Turkey
45: Also at Kafkas University, Kars, Turkey
46: Also at Suleyman Demirel University, Isparta, Turkey
47: Also at Ege University, Izmir, Turkey
48: Also at School of Physics and Astronomy, University of Southampton, Southampton, United Kingdom
49: Also at INFN Sezione di Perugia; Università di Perugia, Perugia, Italy
50: Also at University of Sydney, Sydney, Australia
51: Also at Utah Valley University, Orem, USA
52: Also at Institute for Nuclear Research, Moscow, Russia
53: Also at University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade, Serbia
54: Also at Argonne National Laboratory, Argonne, USA
55: Also at Erzincan University, Erzincan, Turkey
56: Also at Mimar Sinan University, Istanbul, Istanbul, Turkey
57: Also at KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
58: Also at Kyungpook National University, Daegu, Korea