2025/10/24 by Alekhin, S., Garzelli, M. V., Moch, S. +1 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2510.21435
We determine the strong coupling from high-energy data for the Drell-Yan (DY) process and top-quark hadro-production collected at the Large Hadron Collider and the Tevatron combined with the world data on deep-inelastic scattering (DIS) and fixed-target DY data. The theory description uses results at next-to-next-to-leading order in perturbative QCD in the MS-scheme together with leading order QED evolution. The DIS data are subject to stringent kinematic cuts to suppress the contribution of power corrections. We apply a cut on the hadronic invariant mass squared W2 ≥ 12.5~GeV2 together with a series of cuts on momentum transfer squared Q2. Discarding higher-twist terms we find that the value of strong coupling αs(mZ) preferred by the data stabilizes at large enough cuts on Q2, when low-Q2 DIS data sensitive to power corrections are effectively removed. In particular, we extract the value of αs(mZ,Nf=5)=0.1152 ± 0.008 for Nf=5 light flavors with the cut Q2>10~GeV2. In the absence of higher-twist terms less tight cuts on Q2 show a clear deterioration of the fit and lead to rising values of the strong coupling, shifted upwards by about two standard deviations.