Fast evaluation of heavy-quark contributions to DIS in APFEL++

TL;DR

This paper extends a simplified scheme for calculating heavy-quark effects in deep inelastic scattering to charged current processes, implementing it in APFEL++ to improve precision for neutrino physics and parton distribution studies.

Contribution

It introduces a new implementation of the simplified-ACOT scheme for charged current DIS in APFEL++, enhancing accuracy and computational efficiency for heavy-quark contributions.

Findings

Extended the simplified-ACOT scheme to charged current DIS.

Implemented the scheme in the open-source code APFEL++ with gridding techniques.

Enhanced precision for neutrino physics and parton distribution functions.

Abstract

Mass-dependent quark contributions are of great importance to DIS processes. The simplified-ACOT-scheme includes these effects over a wide range of momentum transfers up to next-to-leading order in QCD. In recent years an improvement in the case of neutral current DIS has been achieved by using zero-mass contributions up to next-to-next-to-leading order (NNLO) with massive phase-space constraints. In this work, we extend this approach to the case of charged current DIS and provide an implementation in the open-source code APFEL++. The increased precision will be valuable for ongoing and future neutrino programs, the Electron-Ion-Collider and the studies of partonic substructure of hadrons and nuclei. A highly efficient implementation using gridding techniques extends the applicability of the code to the determination of parton distribution functions (PDFs).