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Search for long-lived particles decaying into muon pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV collected with a dedicated high-rate data stream

The CMS collaboration
CMS-EXO-20-014, 2021.

Abstract (data abstract)
A search for long-lived particles decaying into muon pairs is performed using proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2017 and 2018, corresponding to an integrated luminosity of 101 fb−1. The data sets used in this search were collected with a dedicated dimuon trigger stream with low transverse momentum thresholds, recorded at high rate by retaining a reduced amount of information, in order to explore otherwise inaccessible phase space at low dimuon mass and nonzero displacement from the primary interaction vertex. No significant excess of events beyond the standard model expectation is found. Upper limits on branching fractions at 95 % confidence level are set on a wide range of mass and lifetime hypotheses in beyond the standard model frameworks with the Higgs boson decaying into a pair of long-lived dark photons, or with a long-lived scalar resonance arising from a decay of a b hadron. The limits are the most stringent to date for substantial regions of the parameter space. These results can be also used to constrain models of displaced dimuons that are not explicitly considered in this paper.

  • Figure 6a

    Data from Figure 6a

    10.17182/hepdata.115577.v1/t1

    Expected and observed limits at 95% CL on the branching fraction B(hb --> PHI X) . B(PHI --> mu+mu-) as...

  • Figure 6b

    Data from Figure 6b

    10.17182/hepdata.115577.v1/t2

    Expected and observed limits at 95% CL on the branching fraction B(hb --> PHI X) . B(PHI --> mu+mu-) as...

  • Figure 7a

    Data from Figure 7a

    10.17182/hepdata.115577.v1/t3

    Expected and observed limits at 95% CL on the branching fraction B(H --> ZD ZD) . B(ZD --> mu+mu-) as...

  • Figure 7b

    Data from Figure 7b

    10.17182/hepdata.115577.v1/t4

    Expected and observed limits at 95% CL on the branching fraction B(H --> ZD ZD) . B(ZD --> mu+mu-) as...

  • Figure 8a

    Data from Figure 8a

    10.17182/hepdata.115577.v1/t5

    Expected and observed limits at 95% CL on the branching fraction B(H --> ZD ZD) as a function of signal...

  • Figure 8b

    Data from Figure 8b

    10.17182/hepdata.115577.v1/t6

    Expected and observed limits at 95% CL on the branching fraction B(H --> ZD ZD) as a function of signal...

  • Figure 9

    Data from Figure 9

    10.17182/hepdata.115577.v1/t7

    Observed limits at 95% CL on the branching fraction B(hb --> PHI X) . B(PHI --> mu+mu-) in the parameter...

  • Figure 10

    Data from Figure 10

    10.17182/hepdata.115577.v1/t8

    Observed limits at 95% CL on the branching fraction B(H --> ZD ZD) in the parameter space containing signal mass...

  • Figure 11

    Data from Figure 11

    10.17182/hepdata.115577.v1/t9

    Region excluded at 95% CL using this search for the inflaton model in the parameter space containing signal mass and...

  • Figure 12

    Data from Figure 12

    10.17182/hepdata.115577.v1/t10

    Observed limits at 95% CL on the branching fraction B(H --> ZD ZD) in the parameter space containing signal mass...

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