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

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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, mpolet , or the strong coupling constant, αS . With the parton distribution function set NNPDF2.3, a pole mass of 176.7+3.8−3.4 GeV is obtained when constraining αS at the scale of the Z boson mass, mZ, to the current world average. Alternatively, by constraining mpolet to the latest average from direct mass measurements, a value of αS (mZ) = 0.1151+0.0033−0.0032 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 B
Publication statusPublished - 2014
Externally publishedYes


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

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