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arXiv 0910.2639hep-phastro-ph.HEhep-th
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衰变暗物质强子和轻子活动的Gamma-ray约束

Gamma-ray Constraints on Hadronic and Leptonic Activities of Decaying Dark Matter

Chuan-Ren Chen, Sourav K. Mandal, Fuminobu Takahashi

摘要:

虽然PAMELA和Fermi报告的宇宙射线电子和正电子的过剩可以用暗物质主要衰变为带电轻子来解释,但这并不一定意味着暗物质不应该有任何强子衰变模式。为了量化允许的强子活动,我们推导出的限制暗物质衰变到WW,ZZ,hh,qqbar和gg使用费米和HESS的γ射线数据。我们还得到了轻子e+e-,mu+mu-和tau+tau-最终状态的γ射线约束。我们发现,暗物质必须主要衰变为μ + μ-或τ + τ-,以同时解释报告的过剩,并满足所有的伽马射线约束。

英文摘要:

While the excess in cosmic-ray electrons and positrons reported by PAMELA and Fermi may be explained by dark matter decaying primarily into charged leptons, this does not necessarily mean that dark matter should not have any hadronic decay modes. In order to quantify the allowed hadronic activities, we derive constraints on the decay rates of dark matter into WW, ZZ, hh, qqbar and gg using the Fermi and HESS gamma-ray data. We also derive gamma-ray constraints on the leptonic e+e-, mu+mu- and tau+tau- final states. We find that dark matter must decay primarily into mu+mu- or tau+tau- in order to simultaneously explain the reported excess and meet all gamma-ray constraints.

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