The photon PDF from high-mass Drell-Yan data at the LHC

TL;DR

This paper determines the photon parton distribution function (PDF) using high-mass Drell-Yan data from the LHC, employing advanced computational tools to incorporate NLO QED effects, and compares the results with other recent studies.

Contribution

It introduces a new photon PDF determination from LHC data using the xFitter framework with NLO QED effects and photon-initiated contributions, enhancing previous methods.

Findings

Good agreement with other recent photon PDF determinations

Provides a photon PDF consistent with LHC high-mass Drell-Yan data

Demonstrates the effectiveness of the combined computational framework

Abstract

I present a determination of the photon PDF from a fit to the recent ATLAS measurements of high-mass Drell-Yan lepton-pair production at $\sqrt{s} = 8$ TeV. This analysis is based on the {\tt xFitter} framework interfaced to the {\tt APFEL} program, that accounts for NLO QED effects, and to the {\tt aMCfast} code to account for the photon-initiated contributions within {\tt MadGraph5\_aMC@NLO}. The result is compared with other recent determinations of the photon PDF finding a general good agreement.