Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 85: Cosmic Rays IV

T 85.1: Talk

Thursday, March 19, 2026, 16:15–16:30, KS 00.006

Simulating Cosmic-Ray Hadronic Interactions: Analytic vs. Monte Carlo — •Leonel Morejon — Bergische Universitaet Wuppertal, Wuppertal, Germany

Cosmic-ray hadronic interactions are important in explaining the production of very-high-energy photons and high-energy neutrinos arriving at Earth. For example, galactic neutrino emissions recently reported by IceCube, are expected to result from cosmic-ray interactions in the central region of the galaxy. Hadronic interactions can be modeled with Monte Carlo codes, but the computational effort to explore a variety of model parameters may produce limitations. Conversely, continuous production models exist and are faster to evaluate, but neglect the inherent stochasticity of these interactions.

An alternative approach is presented in this work, describing sequences of hadronic interactions analytically, using the precomputed tables for the products of individual interactions. This has the advantage of including stochastic effects in the sequence (unlike in continuous models) and reinteractions, while keeping the computation analytic, scalable and efficient. The correctness of this approach is verified by comparing to Monte Carlo simulations.

Keywords: multi-messengers; analytical; cosmic-rays; stochastic