Abstract

Results of a search for new particles decaying into eight or more jets and moderate missing transverse momentum are presented. The analysis uses 139 fb(-1) of proton-proton collision data at root s = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018. The selection rejects events containing isolated electrons or muons, and makes requirements according to the number of b-tagged jets and the scalar sum of masses of large-radius jets. The search extends previous analyses both in using a larger dataset and by employing improved jet and missing transverse momentum reconstruction methods which more cleanly separate signal from background processes. No evidence for physics beyond the Standard Model is found. The results are interpreted in the context of supersymmetry-inspired simplified models, significantly extending the limits on the gluino mass in those models. In particular, limits on the gluino mass are set at 2 TeV when the lightest neutralino is nearly massless in a model assuming a two-step cascade decay via the lightest chargino and second-lightest neutralino.

Original languageEnglish
Article number62
Number of pages53
JournalJournal of High Energy Physics
Issue number10
DOIs
Publication statusPublished - 12 Oct 2020

Keywords

  • Hadron-Hadron scattering (experiments)
  • PLUS PLUS
  • EXTENSION
  • DECAY

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY

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