HOPPET v2 release note
Abstract
We document the three main new features in the v2 release series of the HOPPET parton distribution function evolution code, specifically support for NLO QCD evolution in the variable flavour number scheme, for the determination of hadronic structure functions for massless quarks up to NLO, and for QED evolution to an accuracy phenomenologically equivalent to NNLO QCD. Additionally we describe a new Python interface, CMake build option, functionality to save a hoppet table as an LHAPDF grid and update our performance benchmarks, including optimisations in interpolating PDF tables.
Cite
@article{arxiv.2510.09310,
title = {HOPPET v2 release note},
author = {Alexander Karlberg and Paolo Nason and Gavin Salam and Giulia Zanderighi and Frédéric Dreyer},
journal= {arXiv preprint arXiv:2510.09310},
year = {2025}
}
Comments
34 pages. This is the release note for HOPPET v2. The v1 paper can be found at arXiv:0804.3755. This update is connected with the v2.1.4 release, which also corresponds to the version published in EPJC. GitHub repository at https://github.com/hoppet-code/hoppet and current documentation at https://hoppet-code.github.io/hoppet/