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Hints of a charge asymmetry in the electron and positron cosmic-ray excesses

Isabella Masina^1,2 and Francesco Sannino²

¹Dipartimento di Fisica e Scienze della Terra, Università di Ferrara and INFN, Via Saragat 1, I-44122 Ferrara, Italy
²CP3-Origins and DIAS, Southern Denmark University, Campusvej 55, DK-5230 Odense M, Denmark

Phys. Rev. D 87, 123003 – Published 14 June, 2013

DOI: https://doi.org/10.1103/PhysRevD.87.123003

Abstract

By combining the recent data from AMS-02 with those from Fermi-LAT, we show the emergence of a charge asymmetry in the electron and positron cosmic-ray excesses, slightly favoring the electron component. Astrophysical and dark matter inspired models introduced to explain the observed excesses can be classified according to their prediction for the charge asymmetry and its energy dependence. Future data confirming the presence of a charge asymmetry would imply that an asymmetric production mechanism is at play.

Article Text

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