Single top squark production as a probe of natural supersymmetry at the LHC

Single top squark production as a probe of natural supersymmetry at the LHC

Ken-ichi Hikasa hikasa@phys.tohoku.ac.jp Department of Physics, Tohoku University, Sendai 980-8578, Japan    Jinmian Li jinmian.li@adelaide.edu.au ARC Centre of Excellence for Particle Physics at the Terascale, Department of Physics, University of Adelaide, Adelaide, SA 5005, Australia    Lei Wu leiwu@physics.usyd.edu.au ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, The University of Sydney, NSW 2006, Australia    Jin Min Yang jmyang@itp.ac.cn State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Academia Sinica, Beijing 100190, China
July 15, 2019
Abstract

Light top squarks (stops) and light higgsinos are the key features of natural SUSY, where the higgsinos and are nearly degenerate and act as the missing transverse energy () at the LHC. Besides the strong production, the stop can be produced via the electroweak interaction. The determination of the electroweak properties of the stop is an essential task for the LHC and future colliders. So in this paper, we investigate the single stop () production in the natural SUSY at the LHC, which gives the monotop signature from or the monobottom signature from . We perform Monte Carlo simulations for these signatures and obtain the results: (1) The signal has a better sensitivity than for probing natural SUSY; (2) The parameter region with a higgsino mass 100 GeV 225 GeV and stop mass 620 GeV, can be probed through the single stop production with and at 14 TeV HL-LHC with an integrated luminosity of 3000 fb.

pacs:
Valid PACS appear here

I Introduction

The search for supersymmetry (SUSY) is a long-standing important task in particle physics. One prime motivation for weak-scale SUSY is that it protects the Higgs vacuum expectation value without unnatural fine-tuning of the theory parameters. In the minimal supersymmetric standard model (MSSM), only a small subset of the supersymmetric partners strongly relates with the naturalness of the Higgs potential bg (). This can be seen from the minimization of the Higgs potential mz ():

(1)

where is the higgsino mass parameter, and and denote the weak scale soft SUSY breaking masses of the Higgs fields. A moderate or large is assumed in the last approximate equality. and arise from the radiative corrections to the Higgs potential, and the one-loop dominant contribution to is given by tata ()

(2)

In order to obtain the observed value of without large cancelations in Eq. (1), each term on the right hand side should be comparable in magnitude. Thus, the higgsino mass must be of the order of GeV and the requirement of produces an upper bound on the stop mass, which is about 500 GeV stop-mass (); jm () (a 125 GeV Higgs mass can be achieved by a large stop trilinear coupling without very heavy stops in the MSSM or achieved by extending the MSSM with additional D-terms or F-terms langacker (); mohapatra (); cao-mssm-nmssm ()). In addition, since the gluino contributes to at two-loop level, it is also upper bounded by the naturalness gluino-mass () (however, the direct LHC searches have pushed the gluino up to TeV scale gluino-lhc (); cheng () while the recent ATLAS Z-peaked excess may indicate a gluino around 800 GeV z-peak ()).

So to test SUSY naturalness, the crucial task is to search for light stops or higgsinos. The search strategy for the pair productions of these nearly degenerate higgsinos has been recently studied giudice (); nath (); martin (); higgsino-world-0 (); higgsino-world-0.5 (); higgsino-world-1 (); higgsino-world-1.5 (); higgsino-world-2 (); higgsino-world-3 (); higgsino-world-4 (); higgsino-world-5 (); higgsino-world-6 (); higgsino-world-7 (); higgsino-world-8 (). During the LHC run-1, the ATLAS and CMS collaborations have performed the extensive searches for the stops through the gluino-mediated stop production atlas-gluino-stop (); cms-gluino-stop () or the direct stop pair production atlas-stop (); cms-stop (). Meanwhile, many theoretical studies that aim for improving the LHC sensitivity to a light stop have been proposed th-stop-1 (); th-stop-2 (); th-stop-3 (); th-stop-4 (); th-stop-5 (); th-stop-6 (); th-stop-7 (); th-stop-8 (); th-stop-9 (); th-stop-10 (); th-stop-11 (); th-stop-12 (); th-stop-13 (); th-stop-14 (); th-stop-15 (); th-stop-16 (). The current LHC constraints indicate a stop mass bound of hundreds of GeV stop-mass-0 (); stop-mass-1 (); stop-mass-2 (); stop-mass-3 (); stop-mass-4 (); stop-mass-5 (); stop-mass-6 (); stop-mass-7 (); stop-mass-8 (); stop-mass-9 (); stop-mass-10 (), however, those results are affected by the stop polarization states and branching ratios. The constraints on the right-handed stop from the LHC run-1 direct searches atlas-stop (); cms-stop () are usually weakened by the branching ratio suppression, which can still be as light as 230 GeV in some compressed region rstop (). If the stop mass is heavier than about 450 GeV, it is allowed in most parameter space. So in our work, we require the stop mass be heavier than 450 GeV rstop ().

Usually, the stop pair production provides the most sensitive way to search for the stop at the LHC. However, the stop can also participate in the electroweak interaction processes. The determination of the electroweak properties of the stop is an essential task for the LHC and future colliders. In this work, we study the single stop production in the natural SUSY at the LHC. The observation of the single stop production will test the electroweak properties of the stop and the naturalness of the supersymmetry. In the following, we will perform the Monte Carlo simulations for the single stop production and examine its sensitivity at the LHC.

Figure 1: The cross sections of and productions at the 14 TeV LHC for and degenerate higgsinos with mass GeV. The contribution of conjugate process is included.

Ii Calculations and simulations

At the LHC, the single stop production is induced by the electroweak interaction and proceeds through the following process (see Fig. 1 for the corresponding Feynman diagrams):

(3)

Since in natural SUSY the light higgsinos are nearly degenerate, the decay products of will carry small energies and, hence, are too soft to be observed in the detector. Thus, the associated production of can be identified as , which provides a distinctive signature at the LHC.

In Fig. 1, we show the next-to-leading order (NLO) cross sections of the stop pair and the single stop productions for GeV at 14 TeV LHC by using the packages Prospino2 prospino () and MadGolem madgolem (), respectively. The renormalization and factorization scales are taken as the half average of the final states masses. In the calculations of , we use the LO and NLO parton densities given by CTEQ6L1 and CTEQ6M with five active flavors cteq6 (). The contribution of the conjugate process is included. Except for the higgsino mass parameter and right-handed stop soft mass , we assume other soft supersymmetric masses at 1 TeV, and use the packages SOFTSUSY-3.3.9 softsusy () and MSSMCalc mssmcalc () to calculate masses, couplings and branching ratios of the sparticles. Since the cross section of single stop production is not sensitive to , we take for simplicity. We find that the single stop cross section can still reach about 200 fb when GeV. The NLO -factor of the process ranges from 1.25 to 1.33. When the stop becomes heavy, the single stop production cross section will decrease, but slower than the pair production, due to the kinematics.

Next, we investigate the LHC observability of the single stop signatures with the sequent decays and :

(4)
(5)

For the decay , the SM backgrounds to the signal are from the semi- and full-hadronic events fuks-1 (); fuks-2 (); chongsheng ()111Hadronic monotop has received special attention since its signature offers the possibility to use top reconstruction as a tool to reject the backgrounds. In contrast, the leptonic monotops is believed to be more challenging since the branching fraction of the leptonic top quark decay is smaller and since there are two different sources of missing transverse energy, namely a neutrino coming from the top quark decay and the new invisible state. In Ref.fuks-2 (), the authors comparatively studies these two channels and found that the sensitivity of both channels are very similar., where the undetected lepton and the limited jet energy resolution will lead to the relatively large missing transverse energy. The processes and can fake the signal when one of those light-flavor jets are mis-tagged as a -jet. Also, the single top can mimic our signal when the lepton from the boson decay is missed at the detector. While backgrounds are not considered in our simulations due to their small missing energy or cross sections compared to the above backgrounds.

Figure 2: The parton-level distribution of the top quark in the channel for GeV at 14 TeV LHC.

In Fig. 2, we present the parton-level distribution of the top quark in the channel for GeV at 14 TeV LHC. It can be seen that, with the increase of stop mass, the top quark produced from stop decay is boosted and has larger . So, in the analysis of channel, we respectively adopt HEPTopTagger th-stop-2 () and normal hadronic top reconstruction methods for each sample to identify the top quark in the final states and present our results with the best one. The detailed analysis strategies are the followings:

  • Events with any isolated leptons are rejected;

  • Method-1: We use Cambridge-Aachen (CA) algorithms  ca () in Fastjet fastjet () to cluster the jets with to obtain the top-jet candidates. Each candidate must have the top quark substructure required by the HEPTopTagger. The -tagging is also imposed in the top-jet reconstruction. Other energy deposits outside the top-jet are further reconstructed as the normal jets by using anti- algorithm with anti-kt (). The top window used in our analysis is GeV. While the window is taken as the default value in HepTopTagger;

  • Method-2: In normal hadronic top quark reconstruction, a pair of jets is selected with the invariant mass GeV and the smallest . A third jet closest to this di-jet system is used to constitute the top quark candidate. Among these three jets, at least one -jet and is required. The anti- algorithm is used for jet clustering with ;

  • We keep the events with the exact one reconstructed top quark and require 150 GeV 200 GeV;

  • The extra leading jet outside the reconstructed top quark object is vetoed if GeV and ;

  • We define the signal regions according to cuts: (200, 100), (250, 150), (300, 200), (350, 250) for Method-1, and cuts: (200, 50), (250, 50), (300, 100), (350, 100) GeV for Method-2.

For the decay , the SM backgrounds to the signal are dominated by the processes and when the light-flavor jets are mis-identified as -jets liantao (). The events become the sub-leading backgrounds due to their large multiplicity. The signal events are selected to satisfy the following criteria:

  • Events with any isolated leptons are rejected;

  • We require exact one hard -jet in the final states, but allow an additional softer jet with GeV and . Since the hardness of -jet from stop decay depends on the mass splitting between and , we define three signal regions for each sample according to cuts: (100, 70), (150, 100) and (250, 200) GeV.

Finally, we use the most sensitive signal region (with the highest ) for each decay mode and show our results in Fig. 3 and Fig. 4, respectively. In our study, we omitted the QCD multijet backgrounds, whose correct treatment needs the experimental data-driven methods and hence depends on the realistic detector environments of the 14 TeV LHC. As discussed in fuks-2 (); liantao (); cms-monotop (), the requirements of high and large with a seperation can usually be expected to greatly reduce the fake contamination from the QCD backgrounds and allow for a good signal selection efficiency.

The parton level signal and background events are generated with MadGraph5 mad5 (), where is matched up to 3 jets by using MLM matching scheme mlm () and setting GeV. For the value of in matching, we take it to matching () in our simulation. We perform parton shower and fast detector simulations with PYTHIA pythia () and Delphes delphes (). We assume the -jet tagging efficiency as 70% cms-b () and a misidentification efficiency of -jets and light jets as 10% and 0.1%, respectively. The cross section of is normalized to the approximately next-to-next-to-leading order value pb ttbar ().

Iii Results and discussions

cuts
Method-1 0.29 2.20 0.80 0.13 4.0%
Method-2 0.59 0.55 0.24 0.044 3.2%
Table 1: The cross sections of , and for a benchmark point GeV and in Method-1 and Method-2 at 14 TeV LHC with fb. The cross sections are in unit of fb.

In Table 1, we compare the results of for a benchmark point GeV in Method-1 and Method-2 at 14 TeV LHC. From this table we can see that the background in Method-1 is smaller than in Method-2, while the background in Method-1 is larger than in Method-2. However, the signal events can be more kept in Method-1 than in Method-2. So the overall effects make the Method-1 have a better sensitivity in reconstructing the top quark in the region with large mass splitting between and . At 14 TeV LHC with fb, the statistical significance for our benchmark point can reach () with () in Method-1(2).

2.77 1.10 0.20 5.1%
Table 2: The cross sections of , and for a benchmark point GeV and at 14 TeV LHC with fb. The cross sections are in unit of fb.

In Table 2, we show the cross sections of , and for a benchmark point GeV at the 14 TeV LHC. Different from channel, background is dominant over since only one hard -jet is required in the final state. From Table 2 we can see that and can reach and for fb, respectively.

Figure 3: The dependence of the significance of the channel on the higgsino mass and stop mass at the 14 TeV LHC with fb.

In Fig. 3, we display the dependence of statistical significance of the channel on the higgsino mass and stop mass at 14 TeV LHC with fb. We can see that values of decrease with the increase of because of the cut efficiency reduction. When the stop becomes heavy, the cross section of is suppressed. However, as a result of the application of HEPTopTagger method, more signal events can be kept, in particular in the mass range 450 GeV 650 GeV. Therefore, when GeV, the stop mass 610 GeV can be probed at statistical significance with .

Figure 4: Same as Fig. 3, but for the decay channel .

In Fig. 4, the statistical significance of the channel is presented on the plane of higgsino mass versus stop mass at 14 TeV LHC with fb. It can be seen that the sensitive stop region lies in 450 GeV 620 GeV, where a hard -jet ( GeV) and the sizable ( GeV) can be used to effectively suppress the backgrounds. But when the stop mass increases, will rapidly decrease. We see that the higgsino mass 100 GeV 225 GeV and the stop mass 620 GeV can be covered at statistical significance with varying from to .

Iv Conclusions

even its exclusion limit for the stop may be not as good as the pair production. However, the stop can participates in the strong interaction processes but also in the electroweak interaction processes, the determination of the electroweak properties of the stop is an essential task for the LHC and future colliders. In this work we propose to probe natural SUSY by using the electroweak single-stop production at the LHC (here the missing energy is from the nearly degenerate higgsinos). By analyzing the decay channels of the stop and , we obtain the obervations: (1) The decay has a better sensitivity than ; (2) The parameter region with a higgsino mass 100 GeV 225 GeV and the stop mass 620 GeV can be covered with and at 14 TeV HL-LHC with an integrated luminosity of 3000 fb. So the searches for the single stop production will directly test the naturalness of the supersymmetry and the electroweak properties of the stop.

V acknowledgments

Lei Wu thanks David Lopez-Val and Dorival Goncalves for providing us the MadGolem package. This work was partly supported by the Grant-in-Aid for Scientific Research (No. 24540246) from Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, by the Australian Research Council, by the CAS Center for Excellence in Particle Physics (CCEPP), by the National Natural Science Foundation of China (NNSFC) under grants Nos. 11305049, 11275057, 11375001, 11405047, 11275245, 10821504 and 11135003, and by Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20134104120002.

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