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

The CMS collaboration
JHEP 12 (2023) 070, 2023.

Abstract (data 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.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. Limits on parameters for two specific models, a dark photon model and a two Higgs doublet model with an extra scalar, are also set.

  • Figure 4

    Data from Figure 4

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    The signal acceptance and reconstruction efficiency are extracted from DY and pseudoscalar simulations. The acceptance of DY simulation is the...

  • Figure 5-a

    Data from Figure 5-a

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    Expected and observed model independent upper limits at 95% CL on the product of the signal cross section, the branching...

  • Figure 5-b

    Data from Figure 5-b

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    Expected and observed model independent upper limits at 95% CL on the product of the signal cross section, the branching...

  • Figure 6

    Data from Figure 6

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    Observed upper limits at 90% CL on the square of the kinetic mixing coefficient $\epsilon$ in the minimal model of...

  • Figure 7

    Data from Figure 7

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    Observed upper limits at 90% CL on the mixing angle $\theta_H$ for the type IV 2HDM+S scenario with fixed $tan\beta=0.5$

  • Supplementary material Figure 4

    Data from supplementary material Figure 4

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    The combined efficiency of the dimuon scouting trigger and the MVA muon selection, averaged between 2017 and 2018, weighted by...

  • Supplementary material Figure 5

    Data from supplementary material Figure 5

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    Theory cross-section times branching fraction to muons times acceptance for the dark photon and 2HDM+S models.

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