Search for long-lived particles decaying in the CMS endcap muon detectors in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search for long-lived particles (LLPs) produced in decays of standard model (SM) Higgs bosons is presented. The data sample consists of 137 fb${}^{-1}$ of proton-proton collisions at $\sqrt{s}=$ 13 TeV, recorded at the LHC in 2016-2018. A novel technique is employed to reconstruct decays of LLPs in the endcap muon detectors. The search is sensitive to a broad range of LLP decay modes and to masses as low as a few GeV. No excess of events above the SM background is observed. The most stringent limits to date on the branching fraction of the Higgs boson to LLPs subsequently decaying to quarks and ${\tau }^{+}{\tau }^{-}$ are found for proper decay lengths greater than 6, 20, and 40 m, for LLP masses of 7, 15, and 40 GeV, respectively.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures and material, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-20-015 (CMS Public Pages)

References in corpus (14)

• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Particle-flow reconstruction and global event description with the CMS detector
• Pileup subtraction using jet areas
• Echoes of a Hidden Valley at Hadron Colliders
• The CMS trigger system
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• General Gauge Mediation
• Discovering the Higgs Through Highly-Displaced Vertices
• Phenomenology of Hidden Valleys at Hadron Colliders
• A Pure-Glue Hidden Valley I. States and Decays
• Probing Baryogenesis with Displaced Vertices at the LHC
• Performance of the reconstruction and identification of high-momentum muons in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Cited by in corpus (13)

• Review of searches for vector-like quarks, vector-like leptons, and heavy neutral leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the CMS experiment
• Dark sector searches with the CMS experiment
• Exotic Higgs Decays
• Search for long-lived heavy neutral leptons decaying in the CMS muon detectors in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Energetic long-lived particles in the CMS muon chambers
• Long-Lived Light Mediators from Higgs boson Decay at HL-LHC, FCC-hh and a Proposal of Dedicated LLP Detectors for FCC-hh
• Search for long-lived particles decaying in the CMS muon detectors in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for light long-lived particles in $pp$ collisions at $\sqrt{s}=13$ TeV using displaced vertices in the ATLAS inner detector
• Searches for long-lived particles with the ANUBIS experiment
• Sub-GeV dark matter and multi-decay signatures from dark showers at beam-dump experiments
• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee
• DeeLeMa: Missing information search with Deep Learning for Mass estimation
• Search for b hadron decays to long-lived particles in the CMS endcap muon detectors