Improvements in the high-energy lepton propagator PROPOSAL

PROPOSAL is a Monte Carlo simulation library used to describe the propagation of high-energy charged leptons. These leptons can be muons induced by atmospheric air showers or particles produced from interactions of astrophysical high-energy neutrinos with matter, observed with experiments such as the IceCube Neutrino Observatory. PROPOSAL precisely describes the interaction of these particles with matter, especially the occurring energy losses through ionization, direct pair production, bremsstrahlung and inelastic nuclear interaction. The knowledge of these effects is essential for an accurate event reconstruction. However, there are still systematic uncertainties arising from the theoretical predictions as well as physical effects that are not included yet. This talk presents the latest enhancements in PROPOSAL made to further improve the precision and to reduce the systematic uncertainties of the propagation.