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

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Ero, J. and Fabjan, C. and Friedl, M. and Fruhwirth, R. and Ghete, V. M. and Hormann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knunz, V. and Krammer, M. and Kratschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schofbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Béni, Noémi Tekla and Molnár, József and Pálinkás, József and Szillási, Zoltán and Karancsi, János and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2014) Determination of the top-quark pole mass and strong coupling constant from the tt production cross section in pp collisions at √s = 7 TeV. PHYSICS LETTERS B, 728. pp. 496-517. ISSN 0370-2693

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Abstract

The inclusive cross section for top-quark pair production measured by the CMS ex- periment 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 distribu- tion functions to determine the top-quark pole mass, mpole t , or the strong coupling constant, αS. With the parton distribution function set NNPDF2.3, a pole mass of 176.7+3.0 −2.8 GeV is obtained when constraining αS at the scale of the Z boson mass, mZ, to the current world average. Alternatively, by constraining mpole t to the latest average from direct mass measurements, a value of αS(mZ) = 0.1151+0.0028 −0.0027 is extracted. This is the first determination of αS using events from top-quark production.

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