https://doi.org/10.1140/epjc/s10052-010-1317-3
Regular Article - Theoretical Physics
Resolving Fermi, PAMELA and ATIC anomalies in split supersymmetry without R-parity
1
Department of Physics, National Cheng-Kung University, Tainan, 701, Taiwan
2
National Center for Theoretical Sciences, Hsinchu, 300, Taiwan
3
Department of Physics, National Tsing-Hua University, Hsinchu, 300, Taiwan
* e-mail: physchen@mail.ncku.edu.tw
Received:
24
September
2009
Revised:
10
March
2010
Published online:
24
April
2010
A long-lived decaying dark matter as a resolution to Fermi, PAMELA and ATIC anomalies is investigated in the framework of split supersymmetry (SUSY) without R-parity, where the neutralino is regarded as the dark matter and the extreme fine-tuned couplings for the long-lived neutralino are naturally evaded in the usual approach. The energy spectra of electron and positron are from not only the direct neutralino decays denoted by χ→e
+
e
−
ν, but also the decaying chains such as . We find that with a proper lifetime of the neutralino, slepton-mediated effects could explain the ATIC and PAMELA data well, but an inconsistence occurs to the Fermi and PAMELA data without considering the ATIC one. However, by a suitable combination of χ→e
+
e
−
ν and
, the sneutrino-mediated effects could simultaneously account for the Fermi and PAMELA data.
© Springer-Verlag / Società Italiana di Fisica, 2010