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Measurement of the ratio $\mathcal B(t \to Wb)/\mathcal B(t \to Wq)$ in pp collisions at $\sqrt{s}$ = 8 TeV

The CMS collaboration
Phys.Lett.B 736 (2014) 33-57, 2014.

Abstract (data abstract)
CERN-LHC. The ratio of the top-quark branching fractions R = BR(TOP --> W BOTTOM)/BR(TOP --> W QUARK), where the denominator includes the sum over all down-type quarks (QUARK = BOTTOM, STRANGE, DOWN), is measured in the TOP TOPBAR dilepton final state with proton-proton collision data at sqrt(s) = 8 TeV from an integrated luminosity of 19.7 inverse femtobarns, collected with the CMS detector during 2012. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. We present measurements of the top quark-antiquark production cross section, the branching fraction ratio R and the total top-quark decay width.

  • Table 1

    Data from Page 7


    The measured TOP TOPBAR production cross section.

  • Table 2

    Data from Page 13


    The measured ratio of branching fractions, R = BR(TOP --> W BOTTOM) / BR(TOP --> W QUARK) where the denominator...

  • Table 3

    Data from Page 15


    An indirect measurement of the top-quark total decay width.

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