A search for the decays of stopped long-lived particles at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for long-lived particles, which have come to rest within the ATLAS detector, is presented. The subsequent decays of these long-lived particles can produce high-momentum jets, resulting in large out-of-time energy deposits in the ATLAS calorimeters. These decays are detected using data collected during periods in the LHC bunch structure when collisions are absent. The analysed dataset is composed of events from proton-proton collisions produced by the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s}=13$ TeV and recorded by the ATLAS experiment during 2017 and 2018. The dataset used for this search corresponds to a total live time of 579 hours. The results of this search are used to derive lower limits on the mass of gluino $R$-hadrons, assuming a branching fraction $B(\tilde{g}\to q\bar{q}{\tilde{\chi }}_1^0)=100$%, with masses of up to 1.4 TeV excluded for gluino lifetimes of $10^{-5}$ to $10^3$ s.

48 pages in total, author list starting page 32, 10 figures, 8 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2018-15

References in corpus (10)

• Threshold resummation for squark-antisquark and gluino-pair production at the LHC
• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
• HistFitter software framework for statistical data analysis
• NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation
• NNLL resummation for squark and gluino production at the LHC
• Search for decays of stopped long-lived particles produced in proton-proton collisions at sqrt(s) = 8 TeV
• Search for stopped long-lived particles produced in pp collisions at sqrt(s) = 7 TeV
• Monitoring and data quality assessment of the ATLAS liquid argon calorimeter
• Tracking down Quirks at the Large Hadron Collider
• Interactions of Heavy Hadrons using Regge Phenomenology and the Quark Gluon String Model

Cited by in corpus (5)

• Search for long-lived particles decaying to leptons with large impact parameter in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Status of searches for electroweak-scale supersymmetry after LHC Run 2
• On long-lived electroweak-singlet coloured scalars
• TeV Window to Grand Unification: Higgs's Light Color Triplet Partner
• Detecting long-lived particles trapped in detector material at the LHC