Neutrino and Dark Matter Confronting DAMPE Excess
Neutrino and Dark Matter Confronting DAMPE Excess
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发表时间：
2017-12
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通讯作者：
Ran Ding;Zhi-Long Han;Lei Feng;B. Zhu
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作者：
Ran Ding;Zhi-Long Han;Lei Feng;B. Zhu
在电子+正电子谱中，DAMPE在约1.5 TeV处观察到一个尖峰。在本文中，我们解释DAMPE过剩在scotogenic - ii型模型。该模型自然地在单回路水平上产生微小的中微子质量，其中暗物质$\chi$在环路中。如果DM亚晕附近存在，则1.5 TeV左右的DAMPE过剩可以解释为一对DM $\chi$湮灭成一对三重态标量，当$M_\chi\approx M_\Delta\approx$ 3 TeV时，三重态标量以轻子衰减$H^{\pm\pm}\to \ell^\pm\ell^\pm$, $H^{\pm}\to \ell^\pm \nu$和$H^0$, $A^0\to \nu\nu$。包括背景宇宙射线在内，对整个电子+正电子谱的拟合表明，DAMPE过剩倾向于反向中微子质量层次。
The DAMPE has observed a sharp peak at about 1.5 TeV in the electron plus positron spectrum. In this paper, we interpret the DAMPE excess in the scotogenic type-II model. The model naturally generate tiny neutrino mass at one-loop level with dark matter $\chi$ in the loop. Provided the existence of a nearby DM subhalo, the DAMPE excess around 1.5 TeV can be explained by a pair of DM $\chi$ annihilates into a pair of triplet scalars with the triplet scalars decaying leptonicly $H^{\pm\pm}\to \ell^\pm\ell^\pm$, $H^{\pm}\to \ell^\pm \nu$, and $H^0$, $A^0\to \nu\nu$ when $M_\chi\approx M_\Delta\approx$ 3 TeV. Including the background cosmic rays, fitting to the entire electron plus positron spectrum shows that the DAMPE excess favors the inverted neutrino mass hierarchy.