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 N${}^3$LO QCD evolution in the variable flavour number scheme, for the determination of hadronic structure functions for massless quarks up to N${}^3$LO, 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.

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/