NINJA: Automated integrand reduction via Laurent expansion for one-loop amplitudes

We present the public C++ library NiNjA, which implements the Integrand Reduction via Laurent Expansion method for the computation of one-loop integrals. The algorithm is suited for applications to complex one-loop processes. Program summary Program title: Ninja Catalogue identifier: AETO_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AETO_v1_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: GNU General Public License, version 3 No. of lines in distributed program, including test data, etc.: 74303 No. of bytes in distributed program, including test data, etc.: 530944 Distribution format: tar.gz Programming language: C++. Computer: Any computer with a compliant C++ compiler. Operating system: Unix-like (tested on Linux and Mac OS). RAM: Several thousands of bytes (it can vary depending on the complexity of the computation) Classification: 4.4, 11.1. External routines: A library of one-loop Master Integrals: OneLOop, LoopTools, or any other library implementing a suitable interface Nature of problem: Computation of one-loop integrals contributing to scattering amplitudes. Solution method: Semi-numerical implementation of the integrand reduction via Laurent expansion, using a simplified polynomial division algorithm. Running time: Depending on the number of integrals and their complexity, between less than a millisecond up to several seconds per phase-space point, for the computation of a full amplitude. (C) 2014 Elsevier B.V. All rights reserved.