Understanding the new high-energy data-sets measured by BESS,CAPRICE and PAMELA on antiproton flux and p/p ratios

摘要

Reliable data from the very recent high-precision measurementson the antiproton fluxes and the antiproton-to-proton ratios by the PAMELA Col-laboration at relatively much higher energies are now available. The results withregard to antiproton production phenomena spring no special surprises; rather theyare sharply in contrast with and contradiction to the case of positron productionat the same energy range. However, the totality of data on antiproton productionfrom the past experiments to the very recent PAMELA outburst seem to be a verychallenging exercise for interpretation in terms of the secondary production mech-anisms alone, the galactic propagation model, etc. against the background of the"dark-matter"-related controversy. In the present work we assume the validity ofthe simple leaky box model, choose a simple particle production model and attemptat providing a comprehensive interpretation of the totality of data on both antipro-ton flux measurements and the p/p ratio values for the various experiments rangingfrom BESS, CAPRICE to the latest PAMELA experiment. With the assumption ofno contribution from the exotic sources to the antiproton production process, ourmodel and the method describe the totality of the measured data with a fair degreeof success.