The inclusive cross section for top-quark pair production measured by the CMS experiment in protonproton 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, m(t)(pole), or the strong coupling constant, alpha(S). With the parton distribution function set NNPDF2.3, a pole mass of 176.7(-3.4)(+3.8) GeV is obtained when constraining alpha(S) at the scale of the Z boson mass, m(Z), to the current world average. Alternatively, by constraining m(t)(pole) to the latest average from direct mass measurements, a value of alpha(S)(m(Z)) = 0.1151(-0.0032)(+0.0033) is extracted. This is the first determination of alpha(S) using events from top-quark production. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

Chatrchyan, S., Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., et al. (2014). Determination of the top-quark pole mass and strong coupling constant from the t(t)over-bar production cross section in pp collisions at √s=7 TeV. PHYSICS LETTERS. SECTION B, 728, 496-517 [10.1016/j.physletb.2013.12.009].

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

CIOCCI, MARIA AGNESE;MESSINEO, ALBERTO MARIA;
2014-01-01

Abstract

The inclusive cross section for top-quark pair production measured by the CMS experiment in protonproton 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, m(t)(pole), or the strong coupling constant, alpha(S). With the parton distribution function set NNPDF2.3, a pole mass of 176.7(-3.4)(+3.8) GeV is obtained when constraining alpha(S) at the scale of the Z boson mass, m(Z), to the current world average. Alternatively, by constraining m(t)(pole) to the latest average from direct mass measurements, a value of alpha(S)(m(Z)) = 0.1151(-0.0032)(+0.0033) is extracted. This is the first determination of alpha(S) using events from top-quark production. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.
2014
Chatrchyan, S., Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., et al. (2014). Determination of the top-quark pole mass and strong coupling constant from the t(t)over-bar production cross section in pp collisions at √s=7 TeV. PHYSICS LETTERS. SECTION B, 728, 496-517 [10.1016/j.physletb.2013.12.009].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1327941