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

TL;DR

This paper measures the top-quark pole mass and the strong coupling constant by comparing CMS top-quark pair production data at 7 TeV with advanced QCD predictions, providing new insights into fundamental parameters.

Contribution

It presents the first determination of alphaS from top-quark production events and refines the top-quark mass measurement using NNLO QCD predictions with various PDFs.

Findings

Top-quark pole mass is 176.7 +3.0 -2.8 GeV with NNPDF2.3 PDF.

AlphaS(mZ) is 0.1151 +0.0028 -0.0027 when constraining the top-quark mass.

First use of top-quark production data to determine alphaS.

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, mtpole, or the strong coupling constant, alphaS. With the parton distribution function set NNPDF2.3, a pole mass of 176.7 +3.0 -2.8 GeV is obtained when constraining alphaS at the scale of the Z boson mass, mZ, to the current world average. Alternatively, by constraining mtpole to the latest average from direct mass measurements, a value of alphaS(mZ) = 0.1151 +0.0028 -0.0027 is extracted. This is the first determination of alphaS using events from top-quark production.