A search for the decays of stopped long-lived particles at √s = 13 TeV with the ATLAS detector

ATLAS Collaboration, Emma S Kuwertz

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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 $B(\tilde{g} \rightarrow q \bar{q} \tilde{\chi}_1^0)=100$%, with masses of up to 1.4 TeV excluded for gluino lifetimes of $10^{-5}$ to $10^3$ s.
Original languageEnglish
Article number173
JournalJournal of High Energy Physics
Volume2021
Issue number7
DOIs
Publication statusPublished - 23 Jul 2021

Bibliographical note

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

Publisher Copyright:
© 2021, The Author(s).

Keywords

  • hep-ex

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