Search for direct production of GeV-scale resonances decaying to a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for direct production of low-mass dimuon resonances is performed using $\sqrt{s}$ = 13 TeV proton-proton collision data collected by the CMS experiment during the 2017-2018 operation of the CERN LHC with an integrated luminosity of 96.6 fb${}^{-1}$. The search exploits a dedicated high-rate trigger stream that records events with two muons with transverse momenta as low as 3 GeV but does not include the full event information. The search is performed by looking for narrow peaks in the dimuon mass spectrum in the ranges of 1.1-2.6 GeV and 4.2-7.9 GeV. No significant excess of events above the expectation from the standard model background is observed. Model-independent limits on production rates of dimuon resonances within the experimental fiducial acceptance are set. Competitive or world's best limits are set at 90% confidence level for a minimal dark photon model and for a scenario with two Higgs doublets and an extra complex scalar singlet (2HDM+S). Values of the squared kinetic mixing coefficient ${\epsilon }^2$ in the dark photon model above 10${}^{-6}$ are excluded over most of the mass range of the search. In the 2HDM+S, values of the mixing angle $\sin ({\theta }_{\text{H}})$ above 0.08 are excluded over most of the mass range of the search with a fixed ratio of the Higgs doublets vacuum expectation $\tan \beta$ = 0.5.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-21-005 (CMS Public Pages)

References in corpus (9)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• A Theory of Dark Matter
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• Boosted Decision Trees as an Alternative to Artificial Neural Networks for Particle Identification
• Illuminating Dark Photons with High-Energy Colliders
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Higgs boson decays to four fermions through an abelian hidden sector
• Handling uncertainties in background shapes: the discrete profiling method

Cited by in corpus (5)

• Probing for chiral $Z^{\prime }$ gauge boson through scattering measurement experiments
• Search for light neutral particles decaying promptly into collimated pairs of electrons or muons in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Higgs Boson Searches at the LHC Beyond the Standard Model
• Constraints on Kinetic Mixing of Dark Photons from Dilepton Spectra
• Constraints on the $U(1{)}_{B-L}$ model from global QCD analysis