Transverse momentum dependence of the $T$-even hadronic structure functions in the Drell-Yan process

TL;DR

This paper analyzes the transverse momentum dependence of $T$-even hadronic structure functions in the Drell-Yan process, incorporating higher-order QCD corrections and comparing theoretical predictions with LHC data.

Contribution

It provides a detailed perturbative QCD analysis of $Q_T$ dependence of $T$-even structure functions up to NNLO, including comparison with experimental data.

Findings

Good agreement with ATLAS data for angular coefficients

Predictions for forward-backward asymmetry match observed trends

Enhanced understanding of $Q_T$ dependence in Drell-Yan processes

Abstract

We present detailed analysis of the $T$-even lepton angular distribution in the Drell-Yan process including $\gamma/Z^0$ gauge boson exchange and using perturbative QCD based on the collinear factorization scheme at leading order in the $\alpha_s$ expansion. We focus on the study of the transverse momentum $Q_T$ dependence of the corresponding hadronic structure functions and angular coefficients up to next-next-to-leading order in the $Q_T^2/Q^2$ expansion. We analyze $Q_T$ dependence numerically and compare $T$-even angular coefficients integrated over rapidity with available data of the ATLAS Collaboration at LHC. Additionally, we present our results for the forward-backward asymmetry and compare it with data.