Eur. Phys. J. C (2015) 75: 135
https://doi.org/10.1140/epjc/s10052-015-3338-4

Special Article - Tools for Experiment and Theory

Beyond standard model calculations with Sherpa

¹ SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
² Institute for Particle Physics Phenomenology, Durham University, Durham, DH1 3LE, UK
³ II. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077, Göttingen, Germany
⁴ Institut für Kern- und Teilchenphysik, TU Dresden, 01062, Dresden, Germany

^* e-mail: shoeche@slac.stanford.edu

Received: 16 January 2015
Accepted: 27 February 2015
Published online: 24 March 2015

Abstract

We present a fully automated framework as part of the Sherpa event generator for the computation of tree-level cross sections in Beyond Standard Model scenarios, making use of model information given in the Universal FeynRules Output format. Elementary vertices are implemented into C++ code automatically and provided to the matrix-element generator Comix at runtime. Widths and branching ratios for unstable particles are computed from the same building blocks. The corresponding decays are simulated with spin correlations. Parton showers, QED radiation and hadronization are added by Sherpa, providing a full simulation of arbitrary BSM processes at the hadron level.