Data di Pubblicazione:
2009
Abstract:
A new calculation of the $\bar{p}/p$ ratio in cosmic rays is
compared to the recent PAMELA data. The good match up to 100 GeV allows to
set constraints on exotic contributions from thermal WIMP dark matter
candidates. We derive stringent limits on possible enhancements of the
WIMP \pbar flux: a $m_{\rm WIMP}$=100 GeV (1 TeV) signal cannot be
increased by more than a factor 6 (40) without overrunning PAMELA data.
Annihilation through the $W^+W^-$ channel is also inspected and
cross-checked with $e^+/(e^-+e^+)$ data. This scenario is strongly
disfavored as it fails to simultaneously reproduce positron and antiproton
measurements.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
F. Donato; D. Maurin; P. Brun; T. Delahaye; P. Salati
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