Determination of the top-quark pole mass and strong coupling constant from the tbar-t production cross section in pp collisions at √s = 7 TeV (CROSBI ID 200946)
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Podaci o odgovornosti
Chatrchyan, S. ; ... ; Godinović, Nikola ; Lelas, Damir ; Pleština, Roko ; Polić, Dunja ; Puljak, Ivica ; Antunović, Željko ; Kovač, Marko ; Brigljević, Vuko ; Đurić, Senka ; Kadija, Krešo ; Luetić, Jelena ; Mekterović, Darko ; Morović, Srećko ; Tikvica, Lucija ; ... ; Swanson, J.
engleski
Determination of the top-quark pole mass and strong coupling constant from the tbar-t production cross section in pp collisions at √s = 7 TeV
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, alphaS. With the parton distribution function set NNPDF2.3, a pole mass of 176.7 +3.8 -3.4 GeV is obtained when constraining alphaS 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 alphaS(mZ) = 0.1151 +0.0033 -0.0032 is extracted. This is the first determination of alphaS using events from top-quark production.
CMS; physics; Top Quark Pair; cross section; mass; QCD; Strong Coupling Constant
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