Uncover compressed supersymmetry via boosted bosons from the heavier stop/sbottom

Kang, Zhaofeng; Li, Jinmian; Zhang, Mengchao

doi:10.1140/epjc/s10052-017-4951-1

Cited by 7 publications

(3 citation statements)

References 102 publications

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“…Thus the ISR/FSR jet (plus the heavy quark tagging) is needed to trigger these stop events [16][17][18]. In addition, other miscellaneous cut-flow based studies of stop searches in different parameter space have been performed at the LHC [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. A vast number of experimental searches for stop pair productions have been also devoted at the LHC in the past few years [38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Probing stop pair production at the LHC with graph neural networks

Abdughani

Ren

et al. 2019

J. High Energ. Phys.

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Top-squarks (stops) play a crucial role for the naturalness of supersymmetry (SUSY). However, searching for the stops is a tough task at the LHC. To dig the stops out of the huge LHC data, various expert-constructed kinematic variables or cutting-edge analysis techniques have been invented. In this paper, we propose to represent collision events as event graphs and use the message passing neutral network (MPNN) to analyze the events. As a proof-of-concept, we use our method in the search of the stop pair production at the LHC, and find that our MPNN can efficiently discriminate the signal and background events. In comparison with other machine learning methods (e.g. DNN), MPNN can enhance the mass reach of stop mass by several tens of GeV to over a hundred GeV.

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Section: Introductionmentioning

confidence: 99%

Probing stop pair production at the LHC with graph neural networks

Abdughani

Ren

et al. 2019

J. High Energ. Phys.

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“…Searching for the stoponium [30][31][32] is shown to be sensitive to the compressed region of top squark. Compressed top squark is also searched for the case in which it is produced in association with a Z boson or a Higgs from the decay of the heavier top squark assuming that is accessible at the collider [33][34][35][36]. Compressed top squarks are also explored along with intermediate sleptons and charginos leading to multi-lepton final state [37,38].…”

Section: Introductionmentioning

confidence: 99%

Constraining slepton and chargino through compressed top squark search

Konar

Mondal

Swain

2018

J. High Energ. Phys.

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Abstract:We examine the compressed mass spectrum with sub-TeV top squark (t) as lightest colored (s)particle in natural supersymmetry (SUSY). Such spectra are searched along with an additional hard jet, not only to boost the soft decay particles, also to yield enough missing transverse momentum. Several interesting kinematic variables are proposed to improve the probe performance for this difficult region, where we concentrate on relatively clean dileptonic channel of the top squark decaying into lightest neutralino (χ 0 1 ), which is also the lightest supersymmetric particle. In this work, we investigate the merit of these kinematic variables, sensitive to compressed mass region extending the search by introducing additional states, chargino and slepton (sneutrino) having masses in between thẽ t and χ 0 1 . Enhanced production and lack of branching suppression are capable of providing a strong limit on chargino and slepton/sneutrino mass along with top squark mass. We perform a detailed collider analysis using simplified SUSY spectrum and found that with the present LHC data Mt can be excluded up to 710 GeV right away for M χ 0 1 of 640 GeV for a particular mass gap between different states.

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“…The cosmological perspective, with direct and indirect detection of dark matter with top-squark co-annihilation, has been studied recently in [25]. In the compressed mass scenario, generic SUSY phenomenology has been studied by [26], [27], [28], [29]. In this latter case, the decay patterns of the lighter top-squarks change dramatically with minimal mass variations.…”

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confidence: 99%

Production of a light top-squark pair in association with a light non-SM Higgs boson within the NMSSM from proton–proton collisions at s = 13 TeV and 33 TeV

Das

Fraga

Ávila

2019

Int. J. Mod. Phys. A

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We study the potential of the LHC accelerator, and a future 33 TeV proton collider, to observe the production of a light top squark pair in association with the lightest Higgs boson (t 1t1 h 1 ), as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We scan randomly about ten million points of the NMSSM parameter space, allowing all possible decays of the lightest top squark and lightest Higgs boson, with no assumptions about their decay rates, except for known physical constraints such as perturbative bounds, Dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, h 2 , assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and Z invisible width, experimental bounds on B meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our study. We find that for low mass top-squark, the dominating decay mode ist 1 → bχ ± 1 withχ ± 1 → Wχ 0 1 . We use three bench mark points with the highest cross sections, which naturally fall within the compressed spectra of the top squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both W 's and the decay of lightest Higgs boson into b-quarks (h 1 → bb). Our results show that the high luminosity LHC will have limitations to observe the studied signal and only a proton collider with higher energy will be able to observe the SUSY scenario studied with more than three standard deviations over background. * symmetry breaking mechanism in the SM and opens up the second part, which is mandatory to establish the exact nature of the symmetry breaking mechanism and, eventually, identify the possible effects of Supersymmetry (SUSY). The available SUSY models at our disposal are many: minimal Supergravity (mSUGRA), Minimal Supersymmetric Standard Model (MSSM) [3], Next-to-MSSM (NMSSM) [4,5,6,7,8], etc. In our analysis we consider NMSSM model which solved the µ-problem of the MSSM. It is to be noted that the earlier development for the origin of the µ-term in Supertpoetial studied from Supergravity approach [9] and from the non-renormalization operators [10].The appealing of SUSY over the SM leads to an enlarged particle spectrum. As none of the SUSY particles has been discovered by any high energy collider experiment yet, SUSY must be broken. Various scenarios of the breaking mechanism have been developed in the past few decades. The top quark, the heaviest particle among the SM quark sector, having a large Yukawa coupling, has a superpartner called the top-squark, which is expected to be the lightest among all the sparticles in the enlarged squark sector, except for the gaugino sectors, like neutralinos and charginos. The light top-squark is theoretically favored from the stabilization of the Higgs potential, as well as from the longitudinal scattering ...

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Uncover compressed supersymmetry via boosted bosons from the heavier stop/sbottom

Cited by 7 publications

References 102 publications

Probing stop pair production at the LHC with graph neural networks

Probing stop pair production at the LHC with graph neural networks

Constraining slepton and chargino through compressed top squark search

Production of a light top-squark pair in association with a light non-SM Higgs boson within the NMSSM from proton–proton collisions at s = 13 TeV and 33 TeV

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