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.
Highlights
The updates to the PYTHIA 8 event generator to include the popular beyond standard model (BSM) model of supersymmetry (SUSY), additions made to parton showers and hadronization algorithms to allow for exotic colour topologies and generic enhancements made to enable interfacing to partonlevel BSM generators
After electroweak symmetry breaking (EWSB), we are left with five Higgs degrees of freedom viz. the CP-even h0 and H0, the CP-odd A0 and two charged Higgs bosons H ±
(H1 and H2) mix with the neutral U (1) and SU(2) gauginos (Band W 3) to form the mass eigenstates called the neutralinos the charged Higgsino mixes with the charged SU(2) gaugino to form charginos The next-to-minimal supersymmetric extension of the Standard Model (SM) (NMSSM) extends this scenario by adding one extra singlet Higgs field
Summary
(H1 and H2) mix with the neutral U (1) and SU(2) gauginos (Band W 3) to form the mass eigenstates called the neutralinos (χi0; i = 1–4.) the charged Higgsino mixes with the charged SU(2) gaugino to form charginos (χi±; i = 1, 2.) The next-to-minimal supersymmetric extension of the SM (NMSSM) extends this scenario by adding one extra singlet Higgs field. This adds another member to the neutralinos and the neutralino mixing matrix is enlarged to 5 × 5. Supplementary conventions for vertices and most of the cross-section formulae are taken from [14], as detailed below
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