Precision measurement of the W boson decay branching fractions in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
Phys.Rev.D 105 (2022) 072008, 2022.

Abstract (data abstract)
CERN-LHC. Measurement of the leptonic and inclusive hadronic branching fractions of the W boson based on proton-proton collision data collected at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 fb^-1. Events characterized by the production of one or two W bosons are selected and categorized based on the multiplicity and flavor of reconstructed leptons, the number of jets, and the number of jets identified as originating from the hadronization of b quarks. A binned maximum likelihood estimate of the W boson branching fractions is performed simultaneously in each event category. Based on the hadronic branching fraction, several other standard model quantities are derived including the value of the strong coupling constant at the W boson mass, the sum over elements in the first two rows of the CKM matrix , and the value of |V_cs|. Analysis categories defined by the leptonic composition, jet multiplicity, and number of b tags are defined as: - Include one electron with pt > 30 GeV or one muon with pt > 25 GeV that has fired the trigger used to collect the data - Lepton categories are defined as having (Table 1 of preprint): - one additional electron with pt > 20 GeV (ee or emu) - one additional muon with pt > 10 GeV (emu or mumu) - one hadronic tau with pt > 20 GeV (etau_h or mutau_h) - at least four hadronic jets with pt > 30 GeV (eh or muh) - For ee and mumu categories, veto events where the dilepton invariant mass is within 15 GeV of the Z boson mass - Leptonic categories are split according to the number of hadronic jets and the number of b tags (Table 1 of preprint): - ee and mumu categories require at least two jets and number of b tags (=1, >=2) - emu categories require the number of jets (=0, =1, >=2) and the number of b tags (=0, =1, >=2) - etau_h and mutau_h categories require the number of jets (=0, =1, =2, >=3) and the number of b tags (=0, =1, >=2) - eh and muh categories require the number of jets be at least 4 and the number of b tags (=1, >=2)

  • Table 1

    Data from Page 17 of preprint


    Summary of the impacts of each source of uncertainty (quoted as a percent of the total systematic uncertainty) for each...

  • Table 2

    Data from Page 19 of preprint


    Values of the W boson decay branching fractions based on CMS measurement.

  • Table 3

    Data from Page 21 of preprint


    Ratios of W boson leptonic branching fractions.

  • Table 4

    Data from Figure 8


    Correlation matrix between the four W boson decay branching fraction components.

  • Table 5

    Data from Page 22 of preprint


    Values of the QCD coupling constant at the W mass, the charm-strange CKM mixing element, and the squared sum of...

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