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Scientific article
Open access
English

Search for long-lived, massive particles in events with displaced vertices and multiple jets in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 6, 200
Publication date2023
First online date2023-06-29
Abstract

A search for long-lived particles decaying into hadrons is presented. The analysis uses 139 fb$^{−1}$ of pp collision data collected at $ \sqrt{s} $ = 13 TeV by the ATLAS detector at the LHC using events that contain multiple energetic jets and a displaced vertex. The search employs dedicated reconstruction techniques that significantly increase the sensitivity to long-lived particles decaying in the ATLAS inner detector. Background estimates for Standard Model processes and instrumental effects are extracted from data. The observed event yields are compatible with those expected from background processes. The results are used to set limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model, and on scenarios with pair-production of supersymmetric particles with long-lived electroweakinos that decay via a small R-parity-violating coupling. The pair-production of electroweakinos with masses below 1.5 TeV is excluded for mean proper lifetimes in the range from 0.03 ns to 1 ns. When produced in the decay of $ m\left(\overset{\sim }{g}\right) $ = 2.4 TeV gluinos, electroweakinos with $ m\left({\overset{\sim }{\chi}}_1^0\right) $ = 1.5 TeV are excluded with lifetimes in the range of 0.02 ns to 4 ns.

eng
Keywords
  • Beyond Standard Model
  • Hadron-Hadron Scattering
  • Supersymmetry
  • P p: scattering
  • P p: colliding beams
  • Particle: long-lived
  • Sparticle: pair production
  • Gluino: pair production
  • Neutralino: associated production
  • Chargino: associated production
  • Particle: massive
  • ATLAS
  • Background
  • Lifetime
  • Supersymmetry: parameter space
  • Chargino: mass
  • Neutralino: mass
  • New physics: search for
  • R parity: violation
  • Sensitivity
  • Gluino: mass
  • CERN LHC Coll
  • Channel cross section: upper limit
  • Track data analysis: vertex
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for long-lived, massive particles in events with displaced vertices and multiple jets in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 2023, n° 6, p. 200. doi: 10.1007/jhep06(2023)200
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Article (Published version)
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ISSN of the journal1029-8479
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