Determination of the top-quark pole mass and strong coupling constant from the t¯t production cross section in pp collisions at √s = 7 TeV
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Brochero Cifuentes, Javier Andrés; Cabrillo Bartolomé, José Ibán; Calderón Tazón, Alicia; Chuang, S. H.; Duarte Campderros, Jorge; Fernández García, Marcos; Gómez Gramuglio, Gervasio; González Sánchez, Francisco Javier; Graziano, Alberto; Jordá Lope, Clara; López Virto, María Amparo; Marco de Lucas, Jesús; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, Francisco; Muñoz Sánchez, Francisca Javiela; Rodrigo Anoro, Teresa; Rodríguez Marrero, Ana Yaiza; Ruiz Jimeno, Alberto; [et al.]Fecha
2014-01Derechos
Atribución 3.0 España
Publicado en
Physics Letters B, Vol. 728, Pp. 496–517, (2014)
Editorial
Elsevier
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Resumen/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.
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