Constraints on large-$x$ parton distributions from new weak boson production and deep-inelastic scattering data

TL;DR

The paper introduces the CJ15 parton distribution functions, incorporating new experimental data and improved nuclear correction models to better understand the large-x structure of nucleons, especially the d/u ratio.

Contribution

It provides a new set of PDFs that integrate recent data and theoretical advances, reducing uncertainties in large-x parton distributions.

Findings

Reduced uncertainty in the d/u ratio at large x

Inclusion of Jefferson Lab neutron structure data

Enhanced understanding of nuclear effects in parton distributions

Abstract

We present a new set of leading twist parton distribution functions, referred to as "CJ15", which take advantage of developments in the theoretical treatment of nuclear corrections as well as new data. The analysis includes for the first time data on the free neutron structure function from Jefferson Lab, and new high-precision charged lepton and W-boson asymmetry data from Fermilab. These significantly reduce the uncertainty on the d/u ratio at large values of x and provide new insights into the partonic structure of bound nucleons.