ABM11 PDFs and the cross section benchmarks in NNLO

TL;DR

This paper updates the ABKM09 NNLO PDFs with recent collider data, improves heavy-quark treatment, and confirms consistency with LHC results, also providing a precise determination of the strong coupling constant.

Contribution

The paper presents an improved NNLO PDF fit incorporating new data and a refined heavy-quark treatment, along with a precise _s determination.

Findings

ABM11 PDFs agree with LHC W/Z data within uncertainties

_s value of 0.1133(11) consistent with previous results

Enhanced heavy-quark treatment improves PDF accuracy

Abstract

We report an updated version of the ABKM09 NNLO PDF fit, which includes the most recent HERA collider data on the inclusive cross sections and an improved treatment of the heavy-quark contribution to deep-inelastic scattering using advantages of the running-mass definition for the heavy quarks. The ABM11 PDFs obtained from the updated fit are in a good agreement with the recent LHC data on the W- and Z-production within the experimental and PDF uncertainties. We also perform a determination of the strong coupling constant \alpha_s in a variant of the ABM11 fit insensitive to the influence of the higher twist terms and find the value of \alpha_s=0.1133(11) which is in good agreement with the nominal ABM11 one and our earlier determination.