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

Chatrchyan, Serguei

doi:10.1016/j.physletb.2013.12.009

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 · Thu Aug 21 00:00:00 EDT 2014 · Physics Letters B

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

Chatrchyan, Serguei ^[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.

View Accepted Manuscript (DOE)

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: CMS Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1128062

Alternate ID(s):: OSTI ID: 22241872

Report Number(s):: CERN-PH-EP--2013-121; CMS-TOP--12-022; FERMILAB-PUB--13-341-CMS; arXiv eprint number arXiv:1307.1907

Journal Information:: Physics Letters B, Journal Name: Physics Letters B Vol. 728; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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