• Browse all
Search for long-lived particles decaying in the CMS endcap muon detectors in proton-proton collisions at $\sqrt{s} = $ 13 TeV

The CMS collaboration
CMS-EXO-20-015, 2021.

Abstract
A search for long-lived particles (LLPs) produced in decays of standard model (SM) Higgs bosons is presented. The data sample consists of 137 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} =$ 13 TeV, recorded at the LHC in 2016-2018. A novel technique is employed to reconstruct decays of LLPs in the endcap muon detectors. The search is sensitive to a broad range of LLP decay modes and to masses as low as a few GeV. No excess of events above the SM background is observed. The most stringent limits to date on the branching fraction of the Higgs boson to LLPs subsequently decaying to quarks and $\tau^+\tau^-$ are found for proper decay lengths greater than 6, 20, and 40 m, for LLP masses of 7, 15, and 40 GeV, respectively.

  • Figure 3-a (7 GeV)

    Figure 3-a

    10.17182/hepdata.104408.v1/t1

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 7 GeV mass and $...

  • Figure 3-a (15 GeV)

    Figure 3-a

    10.17182/hepdata.104408.v1/t2

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 15 GeV mass and $...

  • Figure 3-a (40 GeV)

    Figure 3-a

    10.17182/hepdata.104408.v1/t3

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 40 GeV mass and $...

  • Figure 3-a (55 GeV)

    Figure 3-a

    10.17182/hepdata.104408.v1/t4

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 55 GeV mass and $...

  • Figure 3-b (7 GeV)

    Figure 3-b

    10.17182/hepdata.104408.v1/t5

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 7 GeV mass and $...

  • Figure 3-b (15 GeV)

    Figure 3-b

    10.17182/hepdata.104408.v1/t6

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 15 GeV mass and $...

  • Figure 3-b (40 GeV)

    Figure 3-b

    10.17182/hepdata.104408.v1/t7

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 40 GeV mass and $...

  • Figure 3-b (55 GeV)

    Figure 3-b

    10.17182/hepdata.104408.v1/t8

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 55 GeV mass and $...

  • Additional Figure 1 (15 GeV)

    Additional Figure 1

    10.17182/hepdata.104408.v1/t9

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 15 GeV mass and $...

  • Additional Figure 1 (40 GeV)

    Additional Figure 1

    10.17182/hepdata.104408.v1/t10

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 40 GeV mass and $...

  • Additional Figure 1 (55 GeV)

    Additional Figure 1

    10.17182/hepdata.104408.v1/t11

    The 95% CL observed and expected limits on the branching fraction B(H $\rightarrow$ SS) for 55 GeV mass and $...

  • Additional Figure 7a

    Additional Figure 7a

    10.17182/hepdata.104408.v1/t12

    The cluster efficiency in bins of hadronic and EM energy in region A. Region A is defined as 391 cm...

  • Additional Figure 7b

    Additional Figure 7b

    10.17182/hepdata.104408.v1/t13

    The cluster efficiency in bins of hadronic and EM energy in region B. Region B is defined as 671 cm...

  • Additional Figure 8

    Additional Figure 8

    10.17182/hepdata.104408.v1/t14

    The efficiency of $N_{station} > 1$ requirement in bins of hadronic energy in region B. Region B is defined as...

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.