2015/10/05 by J. Berdugo, Berdugo, J., J. Casaus +7
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph) #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Neutrino Physics Research #Particle physics theoretical and experimental studies #astro-ph.HE #astro-ph.IM #hep-ph
paper · pdf · doi:10.48550/arxiv.1510.01221
8 pages, 3 figures
arxiv created 2015/10/05 · openalex publication_date 2015/10/05 · arxiv updated 2015/10/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The excess of cosmic-ray positrons in the energy range from 10 GeV to few hundred GeV reported by PAMELA and AMS experiments is not consistent with a pure secondary origin and requires the introduction of a source term. The presence of anisotropies in the positron arrival directions would be a distinctive signature of their origin. Current measurements are consistent with isotropy and limits to a dipole anisotropy have been established. In this note, we review the mathematical basis of this analysis and provide a general bound to the dipole upper limits achievable from a given sample of events. The published experimental limits are confronted with this bound.