Search for dark QCD with emerging jets in proton-proton collisions at s√ = 13 TeV

(CMS Collaboration) Hayrapetyan, Aram ; ... ; Giljanović, Duje ; Godinović, Nikola ; Lelas, Damir ; Šćulac, Ana ; Kovač, Marko ; Petković, Andro ; Šćulac, Toni ; Bargassa, Pedrame ; Brigljević, Vuko ; Chitroda, Bhakti Kanulal ; Ferenček, Dinko ; Jakovčić, Krešimir ; Mishra, Saswat ; Starodumov, Andrey ; Šuša, Tatjana ; ... ; Roguljić, Matej ; ... ; Zhokin, Alexander (2024) Search for dark QCD with emerging jets in proton-proton collisions at s√ = 13 TeV. Journal of High Energy Physics, 2024 (7). ISSN 1126-6708

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Abstract

A search for ``emerging jets'' produced in proton-proton collisions at a center-of-mass energy of 13 TeV is performed using data collected by the CMS experiment corresponding to an integrated luminosity of 138 fb−1. This search examines a hypothetical dark quantum chromodynamics (QCD) sector that couples to the standard model (SM) through a scalar mediator. The scalar mediator decays into an SM quark and a dark sector quark. As the dark sector quark showers and hadronizes, it produces long-lived dark mesons that subsequently decay into SM particles, resulting in a jet, known as an emerging jet, with multiple displaced vertices. This search looks for pair production of the scalar mediator at the LHC, which yields events with two SM jets and two emerging jets at leading order. The results are interpreted using two dark sector models with different flavor structures, and exclude mediator masses up to 1950 (1950) GeV for an unflavored (flavor-aligned) dark QCD model. The unflavored results surpass a previous search for emerging jets by setting the most stringent mediator mass exclusion limits to date, while the flavor-aligned results provide the first direct mediator mass exclusion limits to date.

Item Type:	Article
Uncontrolled Keywords:	High energy physics ; Experimental particle physics ; LHC ; CMS ; Beyond Standard Model ; Dark Matter ; Hadron-Hadron Scattering ; Jets ; p p scattering ; higher-order 0 ; perturbation theory ; quantum chromodynamics model ; new physics ; mediation ; hidden sector ; pair production ; long-lived ; CERN LHC Coll ; showers ; flavor ; jet signature ; structure ; track data analysis ; vertex ; data analysis method ; experimental results ; 13000 GeV-cms
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Division of Experimental Physics
Depositing User:	Sanja Jurković
Date Deposited:	09 Oct 2024 11:26
URI:	http://fulir.irb.hr/id/eprint/9153
DOI:	10.1007/JHEP07(2024)142

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