Nucleon PDF separation with the collider and fixed-target data

TL;DR

This paper analyzes recent collider and fixed-target data to improve the understanding of nucleon quark distributions, especially the strange sea, using various experimental results and theoretical predictions.

Contribution

It provides an improved determination of the strange quark distribution by incorporating neutrino DIS data and collider measurements, and evaluates their impact on nucleon PDFs.

Findings

Enhanced strange sea distribution accuracy with NOMAD and CHORUS data.

Impact of (W + c) production data on strange quark determination.

Comparison of LHC/Tevatron data with NNLO predictions for lepton asymmetry.

Abstract

We consider the impact of the recent data obtained by the LHC, Tevatron, and fixed-target experiments on the nucleon quark distributions with a particular focus on disentangling different quark species. An improved determination of the poorly known strange sea distribution is obtained due to including data from the neutrino-induced deep-inelastic scattering experiments NOMAD and CHORUS. The impact of the associated (W + c) production data by CMS and ATLAS on the strange sea determination is also studied and a comparison with earlier results based on the collider data is discussed. Finally, the recent LHC and Tevatron data on the charged lepton asymmetry are compared to the NNLO ABM predictions and the potential of this input in improving the non-strange sea distributions is evaluated.