Determination of the top-quark pole mass and strong coupling constant from the t-tbar production cross section in pp collisions at sqrt(s) = 7 TeVстатья
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Дата последнего поиска статьи во внешних источниках: 12 июля 2019 г.
Аннотация: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, mpolet, 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 mpolet 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.