Search for long-lived particles decaying in the CMS muon detectors in proton-proton collisions at s√ = 13 TeV
Search for long-lived particles decaying in the CMS muon detectors in proton-proton collisions at s√ = 13 TeV
A search for long-lived particles (LLPs) decaying in the CMS muon detectors is presented. A data sample of proton-proton collisions at s√ = 13 TeV corresponding to an integrated luminosity of 138 fb−1 recorded at the LHC in 2016-2018, is used. The decays of LLPs are reconstructed as high multiplicity clusters of hits in the muon detectors. In the context of twin Higgs models, the search is sensitive to LLP masses from 0.4 to 55 GeV and a broad range of LLP decay modes, including decays to hadrons, τ leptons, electrons, or photons. No excess of events above the standard model background is observed. The most stringent limits to date from LHC data are set on the branching fraction of the Higgs boson decay to a pair of LLPs with masses below 10 GeV. This search also provides the best limits for various intervals of LLP proper decay length and mass. Finally, this search sets the first limits at the LHC on a dark quantum chromodynamic sector whose particles couple to the Higgs boson through gluon, Higgs boson, photon, vector, and dark-photon portals, and is sensitive to branching fractions of the Higgs boson to dark quarks as low as 2×10−3.
hep-ex
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
[Unknown type: UNSPECIFIED]
Abstract
A search for long-lived particles (LLPs) decaying in the CMS muon detectors is presented. A data sample of proton-proton collisions at s√ = 13 TeV corresponding to an integrated luminosity of 138 fb−1 recorded at the LHC in 2016-2018, is used. The decays of LLPs are reconstructed as high multiplicity clusters of hits in the muon detectors. In the context of twin Higgs models, the search is sensitive to LLP masses from 0.4 to 55 GeV and a broad range of LLP decay modes, including decays to hadrons, τ leptons, electrons, or photons. No excess of events above the standard model background is observed. The most stringent limits to date from LHC data are set on the branching fraction of the Higgs boson decay to a pair of LLPs with masses below 10 GeV. This search also provides the best limits for various intervals of LLP proper decay length and mass. Finally, this search sets the first limits at the LHC on a dark quantum chromodynamic sector whose particles couple to the Higgs boson through gluon, Higgs boson, photon, vector, and dark-photon portals, and is sensitive to branching fractions of the Higgs boson to dark quarks as low as 2×10−3.
Text
2402.01898v1
- Author's Original
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Accepted/In Press date: 2 February 2024
Additional Information:
Submitted to Physical Review D. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-21-008 (CMS Public Pages).
Keywords:
hep-ex
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Local EPrints ID: 487554
URI: http://eprints.soton.ac.uk/id/eprint/487554
PURE UUID: 2707d5ad-105b-4d0e-a90b-1f842e69327c
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Date deposited: 23 Feb 2024 17:36
Last modified: 18 Mar 2024 03:06
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Corporate Author: The CMS Collaboration
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