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Title: 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

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.
Authors:
 [1]
  1. et al.
Publication Date:
OSTI Identifier:
1128062
Report Number(s):
FERMILAB-PUB--13-341-CMS; CERN-PH-EP--2013-121; CMS-TOP--12-022
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1307.1907; TRN: US1600979
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 728; Related Information: For Corrigendum, see http://dx.doi.org/10.1016/j.physletb.2014.08.040; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS