# NLO Corrections to Heavy Flavour Distributions in Polarized Deep-Inelastic Scattering

## TL;DR

This paper calculates next-to-leading order heavy flavor contributions to polarized deep-inelastic scattering, providing new tools and results for understanding gluon polarization and heavy quark observables at future colliders.

## Contribution

It introduces a novel NLO calculation and Monte Carlo generator for heavy flavor in polarized DIS, including Z-boson effects, enabling detailed phenomenological analyses.

## Key findings

- First NLO results for heavy flavor in polarized DIS
- Sensitivity studies for gluon helicity distribution at EIC
- Development of a new Monte Carlo generator for heavy quark observables

## Abstract

We present a first calculation of the heavy flavor contribution to the longitudinally polarized DIS structure function $g_1$, differential in the transverse momentum or the rapidity of the observed heavy antiquark $\overline{Q}$. All results are obtained at next-to-leading order accuracy with a newly developed parton-level Monte Carlo generator that also allows one to study observables associated with the heavy quark pair such as its invariant mass distribution or its correlation in azimuthal angle. First phenomenological studies are presented in a kinematic regime relevant for a future Electron-Ion Collider with a particular emphasis on the sensitivity to the helicity gluon distribution. Finally, we also provide first NLO results for the full neutral-current sector of polarized DIS, i.e., including contributions from Z-boson exchange.