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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.

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

 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