Evaluation of alpha_s using the ATLAS inclusive jet cross-section data

TL;DR

This paper determines the strong coupling constant alpha_s using ATLAS jet cross-section data at 7 TeV, comparing various data combination methods and testing the running of alpha_s across a wide momentum range.

Contribution

It provides a new measurement of alpha_s from LHC data with detailed correlation analysis and tests the running of the coupling over a broad energy spectrum.

Findings

Good agreement with the world average of alpha_s at the Z-boson scale

Consistent results with recent Tevatron measurements

Validation of the running of alpha_s between 45 and 600 GeV

Abstract

We present a determination of the strong coupling constant using ATLAS inclusive jet cross section data at sqrt{s} = 7TeV, with their full information on the bin-to-bin correlations. Several procedures for combining the statistical information from the data inputs are compared. The theoretical prediction is obtained using NLO QCD with non-perturbative corrections. Our determination uses inputs with transverse momenta between 45 and 600 GeV, the running of the strong coupling being also tested in this range. Good agreement is observed when comparing our result with the world average at the Z-boson scale, as well as with the most recent results from the Tevatron.