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Search for events with a pair of displaced vertices from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in pp collisions at $\sqrt{s}=13$ TeV
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Search for events with a pair of displaced vertices from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in pp collisions at $\sqrt{s}=13$ TeV

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-2022-01907

摘要

background benchmark CERN LHC Coll data analysis method experimental results GeV-cms Higgs particle: branching ratio: upper limit jet: hadronic muon: spectrometer neutral particle: decay modes neutral particle: lifetime neutral particle: long-lived neutral particle: pair production p p: colliding beams p p: scattering particle: long-lived top: pair production track data analysis: vertex
A search for events with two displaced vertices from long-lived particles (LLP) pairs using data collected by the ATLAS detector at the LHC is presented. This analysis uses 139~fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV recorded in 2015-2018. The search employs techniques for reconstructing vertices of LLPs decaying to jets in the muon spectrometer displaced between 3 m and 14 m with respect to the primary interaction vertex. The observed numbers of events are consistent with the expected background and limits for several benchmark signals are determined. For the Higgs boson with a mass of 125 GeV, the paper reports the first exclusion limits for branching fractions into neutral long-lived particles below 0.1%, while branching fractions above 10% are excluded at 95% confidence level for LLP proper lifetimes ranging from 4 cm to 72.4 m. In addition, the paper present the first results for the decay of LLPs into into $t\overline{t}$ in the ATLAS muon spectrometer.

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