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Measurement of the ratio ß(t ?Wb)/ß(t ?Wq) in pp collisions at vs = 8 TeV

Abstract: The ratio of the top-quark branching fractions R =ß(t ?Wb)/ß(t ?Wq), where the denominator includes the sum over all down-type quarks (q =b, s, d), is measured in the t¯t dilepton final state with proton–proton collision data at vs=8TeVfrom an integrated luminosity of 19.7fb-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 >0.955at 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, Gt=1.36 ± 0.02 (stat.) + 0.14-0.11 (syst.) GeV.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Physics Letters B, Vol. 736, Pp. 33–57, (2014)

Editorial: Elsevier

 Fecha de publicación: 01/09/2014

Nº de páginas: 25

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2014.06.076

ISSN: 0370-2693,1873-2445

Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

Url de la publicación: https://doi.org/10.1016/j.physletb.2014.06.076

Autores/as

KHACHATRYAN, VLADIMIR

JAVIER ANDRES BROCHERO CIFUENTES

MARCOS FERNANDEZ GARCIA

ALBERTO GRAZIANO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO