Eur. Phys. J. C (2014) 74: 3001
https://doi.org/10.1140/epjc/s10052-014-3001-5

Special Article - Tools for Experiment and Theory

GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and beyond

¹ Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany
² Max-Planck-Institut für Physik, Munich, Germany
³ Dipartimento di Fisica, Università di Padova, Padua, Italy
⁴ New York City College of Technology, City University of New York, New York, USA
⁵ The Graduate School and University Center, City University of New York, New York, USA
⁶ Dipartimento di Scienze Fisiche, Università di Napoli and INFN, Sezione di Napoli, Naples, Italy

^* e-mail: gudrun@mpp.mpg.de

Received: 8 May 2014
Accepted: 23 July 2014
Published online: 12 August 2014

Abstract

We present the version 2.0 of the program package GoSam for the automated calculation of one-loop amplitudes. GoSam is devised to compute one-loop QCD and/or electroweak corrections to multi-particle processes within and beyond the Standard Model. The new code contains improvements in the generation and in the reduction of the amplitudes, performs better in computing time and numerical accuracy, and has an extended range of applicability. The extended version of the “Binoth-Les-Houches-Accord” interface to Monte Carlo programs is also implemented. We give a detailed description of installation and usage of the code, and illustrate the new features in dedicated examples.