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, m<inf>t</inf> <sup>pole</sup>, or the strong coupling constant, α<inf>S</inf>. With the parton distribution function set NNPDF2.3, a pole mass of 176. 7<sup>+3.8</sup> <inf>-3.4</inf>GeV is obtained when constraining α<inf>S</inf>at the scale of the Z boson mass, m<inf>Z</inf>, to the current world average. Alternatively, by constraining m<inf>t</inf> <sup>pole</sup>to the latest average from direct mass measurements, a value of α<inf>S</inf>(m<inf>Z</inf>) = 0. 1151<sup>+0.0033</sup> <inf>-0.0032</inf>is extracted. This is the first determination of α<inf>S</inf>using events from top-quark production. © 2013 The Authors. Published by Elsevier B.V.
Chatrchyan, S., Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Bergauer, T., et al. (2014). Determination of the top-quark pole mass and strong coupling constant from the tt̄ production cross section in pp collisions at √s = 7 TeV. PHYSICS LETTERS. SECTION B, 728(1), 496-517 [10.1016/j.physletb.2013.12.009].
Determination of the top-quark pole mass and strong coupling constant from the tt̄ production cross section in pp collisions at √s = 7 TeV
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2014
Abstract
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, m
t pole , or the strong coupling constant, α
S . With the parton distribution function set NNPDF2.3, a pole mass of 176. 7
+3.8 -3.4 GeV is obtained when constraining α
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 α
S (m
Z ) = 0. 1151
+0.0033 -0.0032 is extracted. This is the first determination of α
S using events from top-quark production. © 2013 The Authors. Published by Elsevier B.V.
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Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione.
