Extension of HPL to complex arguments

TL;DR

This paper describes the extension of the Mathematica package HPL to treat harmonic polylogarithms of complex arguments, which appear in the evaluation of Feynman diagrams and supersede the previous version.

Abstract

In this paper we describe the extension of the Mathematica package HPL to treat harmonic polylogarithms of complex arguments. The harmonic polylogarithms have been introduced by Remiddi and Vermaseren and have many applications in high energy particle physics.