# hoppet v2 release note

## TL;DR

The paper introduces new features in the hoppet v2 code for particle physics calculations, including higher-order QCD and QED evolution and a Python interface.

## Contribution

The paper introduces N³LO QCD evolution, massless quark structure functions up to N³LO, and QED evolution at NNLO QCD accuracy in the hoppet v2 release.

## Key findings

- Support for N³LO QCD evolution in the variable flavour number scheme was added.
- A new Python interface and CMake build option were implemented.
- Performance benchmarks were updated with optimizations for interpolating PDF tables.

## 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\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$^3$$\end{document}3LO QCD evolution in the variable flavour number scheme, for the determination of hadronic structure functions for massless quarks up to N\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$^3$$\end{document}3LO, 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.