Supersymmetry and Generic BSM Models in PYTHIA 8

TL;DR

This paper details the implementation of supersymmetric and generic BSM models in PYTHIA 8, including production, decay, and new physics matrix elements, with special attention to exotic color topologies.

Contribution

It introduces a framework for importing generic new-physics matrix elements into PYTHIA 8, expanding its capabilities for BSM simulations.

Findings

Implementation of supersymmetric models in PYTHIA 8

Framework for importing generic new-physics matrix elements

Addressing parton showers in exotic colour topologies

Abstract

We describe the implementation of supersymmetric models in PYTHIA 8, including production and decay of superparticles and allowing for violation of flavour, CP, and R-parity. We also present a framework for importing generic new-physics matrix elements into PYTHIA 8, in a way suitable for use with automated tools. We emphasize that this possibility should not be viewed as the only way to implement new-physics models in PYTHIA 8, but merely as an additional possibility on top of the already existing ones. Finally we address parton showers in exotic colour topologies, in particular ones involving colour epsilon tensors and colour sextets.