Charge Exchange Process in Geant4

doi:10.1016/j.cpc.2026.110033

Charge Exchange Process in Geant4

2026-01-14

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DOI：10.1016/j.cpc.2026.110033

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In the framework of the Geant4 toolkit, a new physics process is introduced for the Monte Carlo simulation of quasi-elastic charge exchange reactions of charged pions and kaons on nuclei. In these reactions, neutral mesons are produced. Such process is needed for the detailed simulation of both signal and background reactions in various experimental setups. One of the motivations of this work is a search for rare invisible decays of neutral mesons that could be possible due to interactions with particles of the hypothetical dark sector. In this article, we describe the implementation of the cross sections of charge exchange processes of pions and kaons, the final state generation algorithm and the ways of turning on the processes in the Geant4 application. The validation versus experimental data is discussed.

Charge Exchange Process in Geant4

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