Determination of the Top-Quark Pole Mass and Strong Coupling Constant From the Tt¯ Production Cross Section in Pp Collisions at S=7 Tev
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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, mt pole, or the strong coupling constant, αS. With the parton distribution function set NNPDF2.3, a pole mass of 176.7−3.4 +3.8 GeV is obtained when constraining αS at the scale of the Z boson mass, mZ, to the current world average. Alternatively, by constraining mt pole to the latest average from direct mass measurements, a value of αS(mZ)=0.1151−0.0032 +0.0033 is extracted. This is the first determination of αS using events from top-quark production. © 2013 The Authors
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Cms, Constant, Coupling, Cross Section, Mass, Pair, Physics, Qcd, Quark, Strong, Top, 550, parton: distribution function, Top Quark Pair, PARTICLE PHYSICS; LARGE HADRON COLLIDER; CMS, Physics, Particles & Fields, Coupling, strong interaction: coupling constant, CMS; Constant; Coupling; Cross section; Mass; Pair; Physics; QCD; Quark; Strong; Top; Nuclear and High Energy Physics, PARTON DISTRIBUTIONS; (MS)OVER-BAR MASSES; HIGGS-BOSON; LHC; JETS, info:eu-repo/classification/ddc/530, Fisica delle particelle, \{CMS\}; LHC; CMS; HEP, cross section, Cross section, CMS, Physics, CMS; physics; Top Quark Pair; cross section; mass; QCD; Strong Coupling Constant, ddc:530, higher-order: 2, Top, mass: pole, CMS; Constant; Coupling; Crosssection; Mass; Pair; Physics; QCD; Quark; Strong; Top; Nuclear and High Energy Physics, Physics, Nuclear, CERN LHC Coll, Quantum Chromodynamics (QCD), 7000 GeV-cms, Physical Sciences, Physique des particules élémentaires, Quark, PARTICLE PHYSICS, LHC, top: pair production, physics, Particles & Fields, top: mass, Astronomy & Astrophysics, p p: inclusive reaction, 530, mass; constant; physics; strong; pair; cms; qcd; coupling; cross section; quark; top, Strong, quantum chromodynamics, Nuclear, Crosssection, Science & Technology, PHYSICS, MULTIDISCIPLINARY, 500, CMS; Physics; Top; Quark; Pair; Cross section; Mass; QCD; Strong; Coupling; Constant, Física, Mass, LARGE HADRON COLLIDER, (MS)OVER-BAR MASSES, QCD, Top quarks, Pair, QC Physics / fizika, PARTON DISTRIBUTIONS, JETS, mass, Strong Coupling Constant, MULTIDISCIPLINARY, Constant, HIGGS-BOSON, experimental results
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01 natural sciences, 06 humanities and the arts, 0103 physical sciences, 0105 earth and related environmental sciences, 0604 arts
Citation
Chatrchyan, S., Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., ...CMS Collaboration (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: Nuclear, Elementary Particle and High-Energy Physics, 728(1), 496-517. doi:10.1016/j.physletb.2013.12.009
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