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Scientific article
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Search for supersymmetry in final states with missing transverse momentum and three or more b-jets in 139 fb-1 of proton–proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

ContributorsATLAS Collaboration
Publication date2023
First online date2023-07-04
Abstract

A search for supersymmetry involving the pair production of gluinos decaying via off-shell third-generation squarks into the lightest neutralino $$(\tilde{\chi }^0_1)$$ ( χ ~ 1 0 ) is reported. It exploits LHC proton–proton collision data at a centre-of-mass energy $$\sqrt{s} = 13$$ s = 13 TeV with an integrated luminosity of 139 fb $$^{-1}$$ - 1 collected with the ATLAS detector from 2015 to 2018. The search uses events containing large missing transverse momentum, up to one electron or muon, and several energetic jets, at least three of which must be identified as containing b -hadrons. Both a simple kinematic event selection and an event selection based upon a deep neural-network are used. No significant excess above the predicted background is found. In simplified models involving the pair production of gluinos that decay via off-shell top (bottom) squarks, gluino masses less than 2.44 TeV (2.35 TeV) are excluded at 95% CL for a massless $$\tilde{\chi }^0_1.$$ χ ~ 1 0 . Limits are also set on the gluino mass in models with variable branching ratios for gluino decays to $$b\bar{b}\tilde{\chi }^0_1,$$ b b ¯ χ ~ 1 0 , $$t\bar{t}\tilde{\chi }^0_1$$ t t ¯ χ ~ 1 0 and $$t\bar{b}\tilde{\chi }^-_1/\bar{t}b\tilde{\chi }^+_1.$$ t b ¯ χ ~ 1 - / t ¯ b χ ~ 1 + .

eng
Keywords
  • P p: scattering
  • P p: colliding beams
  • Gluino: pair production
  • Transverse momentum: missing-energy
  • Gluino: mass: lower limit
  • Top: pair production
  • Gluino: decay modes
  • Family: 3
  • Squark
  • Supersymmetry: parameter space
  • Off-shell
  • ATLAS
  • Final state: ((n)jet lepton)
  • Jet: bottom
  • Bottom: particle identification
  • Muon
  • Electron
  • Gluino: branching ratio
  • Neutralino
  • CERN LHC Coll
  • Kinematics
  • Background
  • Neural network
  • Channel cross section: upper limit
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for supersymmetry in final states with missing transverse momentum and three or more b-jets in 139 fb<sup>-1</sup> of proton–proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector. In: European physical journal. C, Particles and fields, 2023, vol. 83, p. 561. doi: 10.1140/epjc/s10052-023-11543-6
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Identifiers
ISSN of the journal1434-6044
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