Demystifying the compressed top squark region with kinematic variables

Abstract

The ongoing perplexing scenario with no hints of new physics at the Large Hadron Collider can be elucidated amicably if the exotic particle spectrum in many of the well-motivated theoretical models possesses degenerate mass. We investigate the usefulness of different kinematic variables sensitive to the compressed mass region, and propose a search strategy considering a phenomenological supersymmetric scenario where the top squark undergoes a four-body decay due to its extremely narrow mass difference with the lightest supersymmetric particle. Considering a challenging but relatively clean dileptonic decay channel, we demonstrate that one can effectively restrain the significant background from the top quark, which provides a complementary approach to the present CMS analysis. With the new strategic approach the current limit can be extended to a phase-space region that was not explored before.

6 pages, 3 figures, 1 table, Improved analysis and cut flow table added, Results unchanged, Matches with published version of PRD

References in corpus (15)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Squark and gluino production cross sections in pp collisions at $\sqrt{s}$ = 13, 14, 33 and 100 TeV
• Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in $pp$ collisions at $\sqrt{s}=8$TeV with the ATLAS detector
• Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=$ 8 TeV pp collisions with the ATLAS detector
• Using Subsystem MT2 for Complete Mass Determinations in Decay Chains with Missing Energy at Hadron Colliders
• Light Stop Searches at the LHC in Events with One Hard Photon or Jet and Missing Energy
• Closing the stop gap
• Light Stop Decay in the MSSM with Minimal Flavour Violation
• Light Stop Searches at the LHC in Events with two b-Jets and Missing Energy
• New limits on top squark NLSP from ATLAS 4.7 $f{b}^{-1}$ data
• Spot the stop with a b-tag
• HERA and the LHC - A workshop on the implications of HERA for LHC physics: Proceedings - Part A
• Search for a compressed supersymmetric spectrum with a light Gravitino
• Tagging a mono-top signature in Natural SUSY

Cited by in corpus (9)

• LHC Collider Phenomenology of Minimal Universal Extra Dimensions
• Enhancing the discovery prospects for SUSY-like decays with a forgotten kinematic variable
• Boosted jet techniques for a supersymmetric scenario with gravitino LSP
• On the ATLAS Top Mass Measurements and the Potential for Stealth Stop Contamination
• Constraining slepton and chargino through compressed top squark search
• Compressed Stop Searches with Two Leptons and Two b-jets
• Constraining the Compressed Top Squark and Chargino along the W Corridor
• Indian Contributions to LHC Theory
• Markov Chain Monte Carlo analysis to probe trilinear $R$-parity violating SUSY scenarios and possible LHC signatures