Search for Long-Lived Particles Decaying in the CMS End Cap Muon Detectors in Proton-Proton Collisions at √s=13 TeV

(CMS Collaboration) Tumasyan, A.; Adam, W.; ..., ...; Giljanović, Duje; Godinović, Nikola; Lelas, Damir; Puljak, Ivica; Antunović, Željko; Kovač, Marko; Šćulac, Toni; Brigljević, Vuko; Ferenček, Dinko; Majumder, Devdatta; Roguljić, Matej; Starodumov, Andrey; Šuša, Tatjana; ..., ...; Vetens, W. (2021) Search for Long-Lived Particles Decaying in the CMS End Cap Muon Detectors in Proton-Proton Collisions at √s=13 TeV. Physical Review Letters, 127 (26). ISSN 0031-9007

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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 root s = 13 TeV, recorded at the LHC in 2016-2018. A novel technique is employed to reconstruct decays of LLPs in the end cap 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.

Item Type:	Article
Uncontrolled Keywords:	High energy physics; Experimental particle physics; LHC; CMS; Radiation-hard detectors; Si microstrip and pad detectors; Radiation damage to detector materials (solid state); Particle tracking detectors (Solid-state detectors); radiation: damage; CMS: upgrade; tracking detector; semiconductor detector: design; semiconductor detector: microstrip; performance; Hadron-Hadron scattering (experiments); Top physics; p p: scattering; p p: colliding beams; top: single production
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Division of Experimental Physics
Depositing User:	Virna Brumnić
Date Deposited:	26 Mar 2026 13:52
URI:	http://fulir.irb.hr/id/eprint/11508
DOI:	10.1103/PhysRevLett.127.261804

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