Massive quarks in NLO dipole factorization for DIS: Longitudinal photon

TL;DR

This paper presents the first complete NLO calculation of the longitudinal photon-to-quark-antiquark wave function with massive quarks, enabling improved predictions for DIS structure functions involving heavy quarks.

Contribution

It provides the first full one-loop calculation of the massive quark wave function in the dipole framework, extending previous massless results to include quark mass effects.

Findings

NLO correction for massive quarks calculated for the first time.

Results enable evaluation of heavy quark contributions in DIS.

Massive quark effects are significant for structure functions.

Abstract

In this work, we will present the first complete calculation of the one-loop longitudinal photon-to-quark-antiquark light cone wave function, with massive quarks. The quark masses are renormalized in the pole mass scheme. The result is used to calculate the next-to-leading order correction to the high energy Deep Inelastic Scattering longitudinal structure function on a dense target in the dipole factorization framework. For massless quarks the next-to-leading order correction was already known to be sizeable, and our result makes it possible to evaluate it also for massive quarks.