Search for long-lived neutral particles produced in pp collisions at √s = 13  TeV decaying into displaced hadronic jets in the ATLAS inner detector and muon spectrometer

ATLAS Collaboration, Paul Newman

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Abstract

A search is presented for pair production of long-lived neutral particles using 33 fb−1 of √s = 13 TeV proton–proton collision data, collected during 2016 by the ATLAS detector at the LHC. This search focuses on a topology in which one long-lived particle decays in the ATLAS inner detector and the other decays in the muon spectrometer. Special techniques are employed to reconstruct the displaced tracks and vertices in the inner detector and in the muon spectrometer. One event is observed that passes the full event selection, which is consistent with the estimated background. Limits are placed on scalar boson propagators with masses from 125 GeV to 1000 GeV decaying into pairs of long-lived hidden-sector scalars with masses from 8 GeV to 400 GeV. The limits placed on several low-mass scalars extend previous exclusion limits in the range of proper lifetimes cτ from 5 cm to 1 m.
Original languageEnglish
Article number052013
Number of pages29
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume101
Issue number5
DOIs
Publication statusPublished - 30 Mar 2020

Bibliographical note

55 pages in total, author list starting page 27, 6 figures, 9 tables, submitted to Phys. Rev. D. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-61

Keywords

  • hep-ex

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