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| CMS-HIG-17-019 ; CERN-EP-2018-165 | ||
| Search for the Higgs boson decaying to two muons in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 17 July 2018 | ||
| Phys. Rev. Lett. 122 (2019) 021801 | ||
| Abstract: A search for the Higgs boson decaying to two oppositely charged muons is presented using data recorded by the CMS experiment at the CERN LHC in 2016 at a center-of-mass energy $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Data are found to be compatible with the predicted background. For a Higgs boson with a mass of 125.09 GeV, the 95% confidence level observed (expected) upper limit on the production cross section times branching fraction to a pair of muons is found to be 2.95 (2.45) times the standard model expectation. In combination with data recorded at center-of-mass energies $\sqrt{s}= $ 7 and 8 TeV, the observed (expected) upper limit improves to 2.92 (2.16) times the standard model value. This corresponds to an upper limit on the standard model Higgs boson branching fraction to muons of $ 6.4 \times 10^{-4} $. | ||
| Links: e-print arXiv:1807.06325 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The transformed BDT output distributions in data (solid points) and MC simulation (histograms). The stacked solid histograms represent the background processes, while the stacked dashed histograms represent the signal. In the legend, V denotes the vector bosons W and Z, and TTX indicates the top quark pair production in association with a vector boson V or another top quark pair. The vertical lines denote the BDT response intervals indicated in Table 1. |
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Figure 2:
Data and weighted sum of signal-plus-background fits to each category. Events are weighted according to the expected signal-to-background ratio in the category to which they belong. The lower panel shows the difference between the data and the background component of the fit. |
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Figure 3:
The 95% CL upper limit on the signal strength modifier, $\mu $, in the region around the Higgs boson mass for the combination of the 7, 8, and 13 TeV data sets together with the expected limit obtained in the background only hypothesis (dashed black line) and in the signal-plus-background hypothesis (dashed red line) for the SM Higgs boson with $ {m_ {\mathrm {H}}} = $ 125 GeV. |
| Tables | |
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Table 1:
The optimized event categories, the product of acceptance and selection efficiency in% for the different production processes, the total expected number of SM signal events ($ {m_ {\mathrm {H}}} = $ 125 GeV), the estimated number of background events per GeV at 125 GeV, the FWHM of the signal peak, the background functional fit form, and the $S/\sqrt {\smash [b]{B}}$ ratio within the FWHM of the expected signal distribution. |
| Summary |
| In summary, we present a search for the Higgs boson decaying to two muons using data recorded by the CMS experiment at the LHC in 2016 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. No significant evidence for this decay is observed. Limits are set on the cross section times branching fraction of the Higgs boson decaying to two muons. The combination with data recorded at center-of-mass energies of 7 and 8 TeV yields a 95% confidence level observed upper limit of 2.92 times the standard model value for $ m_{\mathrm{H}} = $ 125.09 GeV. The corresponding expected upper limit in the absence of a SM decay in this channel is 2.16, which is the most sensitive to date. Assuming standard model production cross sections for the Higgs boson, the observed limit corresponds to an upper limit of $ 6.4 \times 10^{-4} $ on the Higgs boson branching fraction to two muons. |
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Compact Muon Solenoid LHC, CERN |
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