Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5441
Title: Measurement of the ratio B(t›Wb)/B(t›Wq) in pp collisions at s=8 TeV
Authors: CMS Collaboration
Karapınar, Güler
Keywords: Cabibbo–Kobayashi–Maskawa
Width
Top quarks
Issue Date: Sep-2014
Publisher: Elsevier Ltd.
Source: Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., ...CMS Collaboration (2014). Measurement of the ratio B(t→Wb)/B(t→Wq) in pp collisions at s=8 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 736, 33-57. doi:10.1016/j.physletb.2014.06.076
Abstract: The ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the tt- dilepton final state with proton-proton collision data at s=8 TeV from an integrated luminosity of 19.7 fb-1, collected with the CMS detector. 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. By counting the number of b jets per event, an unconstrained value of R=1.014±0.003(stat.)±0.032(syst.) is measured, in a good agreement with current precision measurements in electroweak and flavour sectors. A lower limit R>0.955 at the 95% confidence level is obtained after requiring R≤1, and a lower limit on the Cabibbo-Kobayashi-Maskawa matrix element |Vtb| > 0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t-channel single-top-quark cross section to determine the top-quark total decay width, Γt=1.36±0.02(stat.)-0.11+0.14(syst.) GeV. © 2014 Elsevier B.V.
URI: http://doi.org/10.1016/j.physletb.2014.06.076
http://hdl.handle.net/11147/5441
ISSN: 0370-2693
Appears in Collections:Mathematics / Matematik
Rectorate / Rektörlük
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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