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arXiv 1407.0863hep-ph
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3.5 keV X射线线与R宇称守恒超对称性

3.5 keV X-ray line and R-Parity Conserving Supersymmetry

Bhaskar Dutta, Ilia Gogoladze, Rizwan Khalid, Qaisar Shafi

摘要:

我们提出了一些R宇称守恒的超对称模型,这些模型可以容纳最近对英仙座星系团和仙女座星系的光谱研究中报道的3.5 keV X射线线。在最小超对称标准模型(MSSM)框架内,质量约为7 keV的暗物质(DM)引力伴子(或轴伴子)衰变为无质量的中性伴子(bino)和寿命约为10^{28}秒的光子。无质量的双星对中微子种类的有效数量N_eff有贡献,未来的数据将检验这一预测。在NMSSM的背景下,我们首先考虑的情况下,比诺是无质量和singlino质量约为7千电子伏。我们还考虑准简并bino-singlino的情况下,DM粒子的质量尺度为O(GeV)或更大。在这种情况下,我们需要质量间隙来产生3.5 keV的线。我们评论的可能性,7千电子伏的singlino衰变通过R宇称违反耦合,而所有其他的中性子是重的。

英文摘要:

We present some R-parity conserving supersymmetric models which can accommodate the 3.5 keV X-ray line reported in recent spectral studies of the Perseus galaxy cluster and the Andromeda galaxy. Within the Minimal Supersymmetric Standard Model (MSSM) framework, the dark matter (DM) gravitino (or the axino) with mass of around 7 keV decays into a massless neutralino (bino) and a photon with lifetime ~10^{28} sec. The massless bino contributes to the effective number of neutrino species N_eff and future data will test this prediction. In the context of NMSSM, we first consider scenarios where the bino is massless and the singlino mass is around 7 keV. We also consider quasi-degenerate bino-singlino scenarios where the mass scale of DM particles are O(GeV) or larger. In such a scenario we require the mass gap to generate the 3.5 keV line. We comment on the possibility of a 7 keV singlino decaying via R parity violating couplings while all other neutralinos are heavy.

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