CMS-PAS-EXO-21-005

CMS-PAS-EXO-21-005
Search for prompt production of a GeV scale resonance decaying to a pair of muons in proton-proton collisions at $ \sqrt{s}= $ 13 TeV
CMS Collaboration
24 March 2023

Abstract: A search for prompt low-mass dimuon resonances is performed using the 13 TeV proton-proton collision data collected by the Compact Muon Solenoid (CMS) detector during the 2017--2018 operation of the CERN's Large Hadron Collider and corresponding to an integrated luminosity of 96.6 fb$^{-1}$. The search exploits a dedicated scouting trigger stream allowing CMS to record events with two muons with transverse momenta as low as 3 GeV by trading off recording the full event information. The search is performed by looking for narrow resonance peaks in the dimuon mass continuum in the ranges from 1.1-2.6 and from 4.2-7.9 GeV. The largest excess is observed in the boosted dimuon category at a dimuon mass of 2.41 GeV with the local significance of 3.2 standard deviations, with the global significance of the excess being 1.3 standard deviations. Model-independent limits on production rates of dimuon resonances within the experimental fiducial acceptance are set. Limits on parameters for two specific models, a dark photon model and a two Higgs doublet model with an extra scalar, are also set. This document has been revised with respect to the version dated March 11th, 2023.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, JHEP 12 (2023) 070. The superseded preliminary plots can be found here.

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