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

Apyan, Aram ; Bauer, Gerry P. ; Busza, Wit ; Cali, Ivan Amos ; Chan, M. ; Di Matteo, Leonardo ; Dutta, V. ; Gomez-Ceballos, Guillelmo ; Goncharov, Maxim ; Gulhan, Doga Can ; Kim, Y. ; Klute, Markus ; Lai, Yue Shi ; Levin, A. ; Luckey, P. David, Jr. ; Teng, Ma ; Nahn, Steven ; Paus, Christoph M. E. ; Roland, Christof E. ; Roland, Gunther M. ; Stephans, George S. F. ; Stockli, Fabian ; Sumorok, Konstanty C. ; Velicanu, Dragos Alexandru ; Wolf, R. ; Wyslouch, Boleslaw ; Yang, M. ; Yilmaz, Yetkin ; Yoon, A. S. ; Zanetti, Marco ; Zhukova, Victoria ; Ralph, Duncan Kelley

Elsevier

Others  :  http://dspace.mit.edu/openaccess-disseminate/1721.1/87575

美国|英语

来源: MIT Theses in DSpace@MIT

【 摘 要 】

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[pole over t], or the strong coupling constant, α[subscript S]. With the parton distribution function set NNPDF2.3, a pole mass of 176.7[+3.8 over −3.4] GeV is obtained when constraining α[subscript S] at the scale of the Z boson mass, m[subscript Z], to the current world average. Alternatively, by constraining m[pole over t] to the latest average from direct mass measurements, a value of α[subscript S](m[subscript Z])= 0.1151[+0.0033 over −0.0032] is extracted. This is the first determination of α[subscript S] using events from top-quark production.