Determination of the top-quark pole mass and strong coupling constant from the t(t)over-bar production cross section in pp collisions at root s=7 TeV

Journal article

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, mtpole, 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 mtpole 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.

Authors: Chatrchyan, S; Khachatryan, V; Sirunyan, A; Tumasyan, A; Adam, W

• Publication status: Published
• Publisher: Elsevier
• Journal: Physics Letters B
• Volume: 728
• Issue: 1
• Pages: 496-517
• Publication date: 2014-01-20
• DOI: 10.1016/j.physletb.2013.12.009
• ISSN: 0370-2693
• Language: English
• Keywords: QCD; Coupling; Pair; Mass; Cross section; Constant; Physics; CMS; Quark; Strong; Top