Parton Distributions and LHC data

TL;DR

This paper reviews recent progress and challenges in parton distribution functions, emphasizing their importance for LHC physics, and demonstrates how recent ATLAS and CMS data constrain PDFs for the first time.

Contribution

It presents the first constraints on PDFs derived from LHC measurements, specifically using W lepton asymmetry data from ATLAS and CMS.

Findings

LHC data significantly constrains PDFs.

W lepton asymmetry data impacts parton distribution modeling.

First constraints on PDFs from LHC measurements.

Abstract

In this contribution we briefly report on the progress and open problems in parton distribution functions (PDFs), with emphasis on their implications for LHC phenomenology. Then we study the impact of the recent ATLAS and CMS W lepton asymmetry data on the NNPDF2.1 parton distributions. We show that these data provide the first constrains on PDFs from LHC measurements.