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Title

Determination of the top-quark pole mass and strong coupling constant from the tt̄ production cross section in pp collisions at √s = 7 TeV

AuthorsChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Chuang, S. H. ; Duarte Campderros, J. ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Graziano, A. ; Jorda, C. ; López Virto, A. ; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; CMS Collaboration
Issue Date2014
PublisherElsevier
CitationPhysics Letters B 728: 496-517 (2014)
AbstractThe 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, mt pole, or the strong coupling constant, αS. With the parton distribution function set NNPDF2.3, a pole mass of 176. 7+3.8 -3.4 GeV is obtained when constraining αS at the scale of the Z boson mass, mZ, to the current world average. Alternatively, by constraining mt pole to the latest average from direct mass measurements, a value of αS(mZ) = 0. 1151+0.0033 -0.0032 is extracted. This is the first determination of αS using events from top-quark production. © 2013 The Authors. Published by Elsevier B.V.
DescriptionOpen Access Under a Creative Commons license.-- et al.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2013.12.009
URIhttp://hdl.handle.net/10261/110501
DOI10.1016/j.physletb.2013.12.009
Identifiersdoi: 10.1016/j.physletb.2013.12.009
issn: 0370-2693
Appears in Collections:(IFCA) Artículos
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