Determination of the top-quark pole mass and strong coupling constant from the t t-bar production cross section in pp collisions at $$\sqrt{s}$$ = 7 TeV

Journal Article · 21 August 2014 · Physics Letters B

DOI: https://doi.org/10.1016/j.physletb.2013.12.009 · OSTI ID:1128062

Chatrchyan, Serguei ^[1]

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1. et al.

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, $$m_t^{pole}$$, or the strong coupling constant, $$\alpha_S$$. With the parton distribution function set NNPDF2.3, a pole mass of 176.7$$^{+3.0}_{-2.8}$$ GeV is obtained when constraining $$\alpha_S$$ at the scale of the Z boson mass, $$m_Z$$, to the current world average. Alternatively, by constraining $$m_t^{pole}$$ to the latest average from direct mass measurements, a value of $$\alpha_S(m_Z)$$ = 0.1151$$^{+0.0028}_{-0.0027}$$ is extracted. This is the first determination of $$\alpha_S$$ using events from top-quark production.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: CMS Collaboration
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1128062
• Report Number(s): FERMILAB-PUB-13-341-CMS; CERN-PH-EP-2013-121; CMS-TOP-12-022; arXiv eprint number arXiv:1307.1907; TRN: US1600979
• Journal Information: Physics Letters B, Vol. 728; Related Information: For Corrigendum, see http://dx.doi.org/10.1016/j.physletb.2014.08.040; ISSN 0370-2693
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English