Determination of the strong coupling constant from inclusive jet cross section in ppbar collisions at sqrt(s)=1.96 TeV with the D0 experiment

TL;DR

This paper measures the strong coupling constant alpha_s at different energy scales using inclusive jet cross section data from proton-antiproton collisions at 1.96 TeV, achieving the most precise collider-based result to date.

Contribution

It provides a new, highly precise determination of alpha_s(M_Z) from jet data, incorporating advanced perturbative QCD calculations and threshold corrections.

Findings

Alpha_s(M_Z)=0.1161 with uncertainties

First precise alpha_s measurement from a hadron collider

Validates perturbative QCD calculations at high energies

Abstract

The strong coupling constant alpha_s and its dependence on the momentum scale is determined from the p_T dependence of the inclusive jet cross section in ppbar collisions at sqrt(s)=1.96 TeV measured with the D0 experiment. The jet transverse momentum range of 50 < p_T < 145 GeV contributes to the determination. Using perturbative QCD caclulations to order O(alpha_s^3) combined with resummed threshold corrections to order O(alpha_s^4) an alpha_s(M_Z)=0.1161^{+0.0041}_{-0.0048} is obtained. This is the most precise result from a hadron-hadron collider.