Open source event generation for BSM scenarios

Heavy Neutral Leptons (HNLs) are sterile neutrinos posited as an explanation for light neutrino masses. IceCube is uniquely capable of searching for an HNL in the hundreds of MeV to single GeV range by looking for atmospheric tau neutrinos upscattering to HNLs in the detector. The HNLs produced in IceCube would decay quickly, leading to Cherenkov radiation in both production and decay separated by a few meters, producing a “double cascade” signature in the detector.A simulation based on the most up-to-date calculations of HNL decay modes and cross-sections, is required to understand the hundreds of MeV to single GeV parameter space for an HNL search. This talk presents the capabilities of a new HNL simulation, compatible with the open-source MC generator LeptonInjector and useful for simulating a wide range of HNL scenarios.