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Search for neutral long-lived particles in $pp$ collisions at $\sqrt{s}=13$ TeV that decay into displaced hadronic jets in the ATLAS calorimeter
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Search for neutral long-lived particles in $pp$ collisions at $\sqrt{s}=13$ TeV that decay into displaced hadronic jets in the ATLAS calorimeter

Georges Aad, Braden Keim Abbott, Dale Abbott, Adam Abed Abud, Kira Abeling, Deshan Kavishka Abhayasinghe, Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2022
DOI: https://doi.org/10.3204/pubdb-2022-01906

摘要

background benchmark calorimeter: hadronic CERN LHC Coll channel cross section: branching ratio: upper limit data analysis method experimental results final state: ((n)jet) GeV-cms Higgs particle: mass jet: hadronic kinematics mass dependence neutral particle: hadronic decay neutral particle: lifetime neutral particle: long-lived neutral particle: pair production p p: colliding beams p p: scattering track data analysis: jet track data analysis: vertex
A search for decays of pair-produced neutral long-lived particles (LLPs) is presented using 139 fb$^{-1}$ of proton-proton collision data collected by the ATLAS detector at the LHC in 2015-2018 at a centre-of-mass energy of 13 TeV. Dedicated techniques were developed for the reconstruction of displaced jets produced by LLPs decaying hadronically in the ATLAS hadronic calorimeter. Two search regions are defined for different LLP kinematic regimes. The observed numbers of events are consistent with the expected background, and limits for several benchmark signals are determined. For a SM Higgs boson with a mass of 125 GeV, branching ratios above 10% are excluded at 95% confidence level for values of $c$ times LLP mean proper lifetime in the range between 20 mm and 10 m depending on the model. Upper limits are also set on the cross-section times branching ratio for scalars with a mass of 60 GeV and for masses between 200 GeV and 1 TeV.

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