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

CMS Collaboration

Research output: Contribution to journalArticle

88 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)496-517
Number of pages22
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume728
DOIs
Publication statusPublished - Jan 20 2014

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Keywords

  • CMS
  • Constant
  • Coupling
  • Cross section
  • Mass
  • Pair
  • Physics
  • QCD
  • Quark
  • Strong
  • Top

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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