Speaker
Dr
Giuseppe Di Sciascio
(INFN - Sezione di Roma Tor Vergata)
Description
Cosmic ray antiprotons provide an important probe for the study of cosmic-ray
propagation in the interstellar space and to investigate the existence of Galactic
dark matter. The ARGO-YBJ experiment, located at the Yangbajing Cosmic Ray
Laboratory (Tibet, P.R. China, 4300 m a.s.l., 606 g/cm$^2$ ), is the only experiment
exploiting the full coverage approach at very high altitude presently at work. The
ARGO-YBJ experiment is particularly effective in measuring the cosmic ray antimatter
content via the observation of the cosmic rays Moon shadowing effect.
Based on all the data recorded during the period from July 2006 through November 2009
and a full Monte Carlo simulation, we searched for the existence of the shadow
produced by antiprotons at the few-TeV energy region. No evidence of the existence of
antiprotons was found in this energy region. Upper limits to the antip/p flux ratio
are set to 5% at a median energy of 2 TeV and 6% at 5 TeV with a confidence level of
90%. In the few-TeV energy range this result is the lowest available.
Primary authors
Dr
Giuseppe Di Sciascio
(INFN - Sezione di Roma Tor Vergata)
Dr
Roberto Iuppa
(INFN - Sezione di Roma Tor Vergata)
