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Determination of the top-quark pole mass and strong coupling constant from the t¯t production cross section in pp collisions at vs = 7 TeV

Abstract: Determination of the top-quark pole mass and strong coupling constant from the t¯t production cross section in pp collisions at vs = 7 TeV The inclusive cross section for top-quark pair production measured by the CMS experiment in proton–proton collisions at a center-of-mass energy of 7 TeV is compared to the QCD prediction at next-to-next-to-leading order with various parton distribution functions to determine the top-quark pole mass, mpole t , or the strong coupling constant, aS . With the parton distribution function set NNPDF2.3, a pole mass of 176.7+3.8 -3.4 GeV is obtained when constraining aS at the scale of the Z boson mass, mZ, to the current world average. Alternatively, by constraining mpole t to the latest average from direct mass measurements, a value of aS (mZ) = 0.1151+0.0033-0.0032 is extracted. This is the first determination of aS using events from top-quark production.

 Fuente: Physics Letters B, Vol. 728, Pp. 496–517, (2014)

 Editorial: Elsevier

 Fecha de publicación: 01/01/2014

 Nº de páginas: 22

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2013.12.009

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2013.12.009

Autoría

CHATRCHYAN, SERGUEI

JAVIER ANDRES BROCHERO CIFUENTES

SHANHUEI CHUANG

MARCOS FERNANDEZ GARCIA

CLARA JORDA LOPE

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO