Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-11-17
Phys.Lett.B688:216-223,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 7 figures, Latex, extragalactic gamma rays are included, version to appear in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2010.04.014
Motivated by recent observations from Pamela, Fermi and H.E.S.S., we consider dark matter decays in the framework of supersymmetric SU(5) grand unification theories. An SU(5) singlet S is assumed to be the main component of dark matters, which decays into visible particles through dimension six operators suppressed by the grand unification scale. Under certain conditions, S decays dominantly into a pair of sleptons with universal coupling for all generations. Subsequently, electrons and positrons are produced from cascade decays of these sleptons. These cascade decay chains smooth the electron/positron spectrum, which permit naturally a good fit to the Fermi LAT data. The observed positron fraction upturn by PAMELA can be reproduced simultaneously. We have also calculated diffuse gamma-ray spectra due to the electron/positron excesses and compared them with the preliminary Fermi LAT data from 0.1 GeV to 10 GeV in the region 0
Luo Ming-xing
Wang Liucheng
Wu Wei
Zhu Guohuai
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