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

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).

P. Risse, V. Bertone, T. Ježo, M. Klasen, K. Kovařík, F.I. Olness, I. Schienbein, „Fast evaluation
of heavy-quark contributions to DIS in APFEL++“, 17. Juli 2023, arXiv:2307.08269 (2023).

https://arxiv.org/abs/2307.08269

Related to Project C05