Abstract
Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association with a vector boson, and in association with a top quark-antiquark pair. The analysis is performed using proton-proton collision data at sqrt{s} = 13 TeV, corresponding to an integrated luminosity of 137 fb−1, recorded by the CMS experiment at the CERN LHC. An excess of events over the back- ground expectation is observed in data with a significance of 3.0 standard deviations, where the expectation for the standard model (SM) Higgs boson with mass of 125.38 GeV is 2.5. The combination of this result with that from data recorded at sqrt{s} = 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.7 fb−1, respectively, increases both the expected and observed significances by 1%. The measured signal strength, relative to the SM prediction, is {1.19}_{-0.39}^{+0.40}{left(mathrm{stat}right)}_{-0.14}^{+0.15}left(mathrm{syst}right) . This result constitutes the first evidence for the decay of the Higgs boson to second generation fermions and is the most precise measurement of the Higgs boson coupling to muons reported to date.
Highlights
137 fb−1, recorded by the CMS experiment at the CERN LHC
Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association with a vector boson, and in association with a top quark-antiquark pair
The measured signal strength, relative to the standard model (SM) prediction, is 1.19+−00..4309(stat)+−00..1154(syst). This result constitutes the first evidence for the decay of the Higgs boson to second generation fermions and is the most precise measurement of the Higgs boson coupling to muons reported to date
Summary
The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Forward calorimeters extend the pseudorapidity coverage provided by the barrel and endcap detectors. Events of interest are selected using a twotiered trigger system [26]. The first level (L1) is composed of custom hardware processors, which use information from the calorimeters and muon detectors to select events at a rate of about 100 kHz. The second level, known as high-level trigger (HLT), is a softwarebased system which runs a version of the CMS full event reconstruction optimized for fast processing, reducing the event rate to about 1 kHz. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. [27]
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