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New determination of the production cross section for secondary positrons and electrons in the Galaxy

Luca Orusa, Mattia Di Mauro, Fiorenza Donato, Michael Korsmeier

SciPost Phys. Proc. 13, 006 (2023) · published 28 September 2023

Proceedings event

21st International Symposium on Very High Energy Cosmic Ray Interactions


The cosmic-ray fluxes of electrons and positrons ($e^{±}$) are measured with high precision by the space-borne particle spectrometer AMS-02. To infer a precise interpretation of the production processes for $e^{±}$ in our Galaxy, it is necessary to have an accurate description of the secondary component, produced by the interaction of cosmic-ray proton and helium with the interstellar medium atoms. We determine new analytical functions of the Lorentz invariant cross section for the production of $e^±$ by fitting data from collider experiments. The total differential cross section $d\sigma/dT_{e^±}(p+p→ e^±+X)$ is predicted with an uncertainty of about 5-7% in the energies relevant for AMS-02 positron flux. For further information about this work refer to [Phys. Rev. D 105, 123021 (2022)].

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