Resolving Fermi, PAMELA and ATIC anomalies in split supersymmetry without R-parity

Details Resolving Fermi, PAMELA and ATIC anomalies in split supersymmetry without R-parity Resolving Fermi, PAMELA and ATIC anomalies in split supersymmetry without R-parity

2009-05-05

arxiv.org/abs/0905.0652v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 10 figures

Scientific paper

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 $\chi\to e^+ e^- \nu$, but also the decaying chains such as $\chi\to e^+ \nu \mu(\to \nu_\mu e \bar \nu_e)$. We find that with a proper lifetime of the neutralino, slepton-mediated effects could explain the ATIC and PAMELA data well, but a inconsistence occurs to it the Fermi and PAMELA data without considering the ATIC one. However, by a suitable combination of $\chi\to e^+ e^- \nu$ and $\chi\to e^+ \nu \mu(\to \nu_\mu e \bar \nu_e)$, the sneutrino-mediated effects could simultaneously account for the Fermi and PAMELA data.

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