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arXiv 0903.3116astro-ph.HEastro-ph.COhep-ph
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暗物质湮灭进入长寿命中间态的现象学

Phenomenology of Dark Matter annihilation into a long-lived intermediate state

Ira Z. Rothstein, Thomas Schwetz, Jure Zupan

摘要:

我们提出了一个方案,暗物质(DM)湮灭到一个中间状态,旅行的距离$λ\equiv v/Γ$的数量级的星系尺度,然后衰变到标准模型(SM)粒子。长的寿命分散的SM粒子的生产区远离银河系中心,因此,放松约束的伽玛射线观测规范湮灭的情况下。我们利用这一设置来解释电子和正电子过剩最近观察到的PAMELA,ATIC和费米。虽然在通常的DM湮灭的解释似乎与伽马射线观测相冲突,我们表明,在提出的方案,PAMELA/ATIC/费米的结果是一致的伽马射线数据。从衰变方案的区别discsussed,我们评论的DM生产在LHC的前景。中间态的典型衰变长度$λ\gtrsim 10$ kpc可以从一个被$Λ\sim 10^{13}$ GeV尺度所抑制的六维算符得到,这个尺度大致是中微子质量的跷跷板尺度。

英文摘要:

We propose a scenario where Dark Matter (DM) annihilates into an intermediate state which travels a distance $λ\equiv v/Γ$ on the order of galactic scales and then decays to Standard Model (SM) particles. The long lifetime disperses the production zone of the SM particles away from the galactic center and hence, relaxes constraints from gamma ray observations on canonical annihilation scenarios. We utilize this set up to explain the electron and positron excesses observed recently by PAMELA, ATIC, and FERMI. While an explanation in terms of usual DM annihilations seems to conflict with gamma ray observations, we show that within the proposed scenario, the PAMELA/ATIC/FERMI results are consistent with the gamma ray data. The distinction from decay scenarios is discsussed and we comment on the prospects for DM production at LHC. The typical decay length $λ\gtrsim 10$ kpc of the intermediate state can have its origin from a dimension six operator suppressed by a scale $Λ\sim 10^{13}$ GeV, which is roughly the seesaw scale for neutrino masses.

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