Secondary Lepton Production, Propagation, and Interactions with NuLeptonSim
arxiv(2023)
Abstract
Charged current interactions of neutrinos inside the Earth can result in
secondary muons and τ - leptons which are detectable by a large swath of
existing and planned neutrino experiments through a wide variety of event
topologies. Consideration of such events can improve detector performance and
provide unique signatures which help with event reconstruction. In this work,
we describe NuLeptonSim, a propagation tool for neutrinos and charged leptons
that builds on the fast NuTauSim framework. NuLeptonSim considers energy losses
of charged leptons, modelled both continuously for performance or
stochastically for accuracy, as well as interaction models for all flavors of
neutrinos, including the Glashow resonance. We demonstrate the results from
including these effects on the Earth emergence probability of various charged
leptons from different flavors of primary neutrino and their corresponding
energy distributions. We find that the emergence probability of muons can be
higher than that of taus for energies below 100 PeV, whether from a primary
muon or τ neutrino, and that the Glashow resonance contributes to a
surplus of emerging leptons near the resonant energy.
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