Extension of HPL to complex arguments

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 [E. Remiddi, J.A.M. Vermaseren, Int. J. Modern Phys. A 15 (2000) 725, hep-ph/9905237] and have many applications in high energy particle physics. Title of program: HPL Catalogue Id: ADWX_v2_0 Nature of problem Computer algebraic treatment of the harmonic polylogarithms which appear in the evaluation of Feynman diagrams. Versions of this program held in the CPC repository in Mendeley Data ADWX_v1_0; HPL; 10.1016/j.cpc.2005.10.008 ADWX_v2_0; HPL; 10.1016/j.cpc.2011.11.015 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)