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 language | English |
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Pages (from-to) | 496-517 |
Number of pages | 22 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 728 |
DOIs | |
Publication status | Published - 2014 Jan 20 |
Bibliographical note
Publisher Copyright:© 2013 The Authors
Keywords
- CMS
- Constant
- Coupling
- Cross section
- Mass
- Pair
- Physics
- QCD
- Quark
- Strong
- Top
ASJC Scopus subject areas
- Nuclear and High Energy Physics