1999/04/07 by Piero Ullio, Ullio, Piero · 1 citation
Physics and Astronomy · #Astrophysics (astro-ph) #Atomic and Molecular Physics #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Quantum Electrodynamics and Casimir Effect #astro-ph #hep-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9904086
7 pages, 5 figures
arxiv created 1999/04/07 · openalex publication_date 1999/04/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
More than a decade ago it was noticed that an unexpectedly large value of the measured cosmic antiproton flux at low kinetic energies could be interpreted in terms of a neutralino-induced component. An overproduction of low energy antiprotons seems however to be disfavoured by recent data from the BESS experiment. The strategy we propose here is to focus instead on the high energy antiproton spectrum. We find cases in which the signal from neutralino annihilations in a clumpy halo scenario can be unambiguously distinguished from the cosmic ray induced component. Such signatures can be tested in the near future by upcoming experiments. We investigate also the possibility that antiprotons have a finite lifetime. We find cases in which the neutralino-induced flux is consistent with present data for a lifetime as low as 0.15 Myr, in clear violation of a recent bound derived from the antiproton cosmic ray flux.