论文标题
Xenon1t当地$ z_2 $ dm型号的Xenon1t多余
XENON1T excess in local $Z_2$ DM models with light dark sector
论文作者
论文摘要
最近，Xenon1t合作宣布，他们观察到2-3 KEV附近的电子后坐力能量过多。我们表明，这种过量可以解释为激发暗物质（XDM）的放热散射，$ xdm + e_ {atomic} \ rightarrow dm + e_ + e_ {free} $通过深色光子交换在原子电子上。我们考虑使用本地深色$ U（1）$规范对称性的DM型号，该模型被Krauss-Wilczek机制自发地分解为其$ Z_2 $子组。为了在冻结场景中用正确的DM热物物密度解释Xenon1t过量，黑暗部门中的所有粒子都应该足够轻，即标量dm和$ \ sim o（100）$ MEV的$ \ sim o（100）$ \ sim o（1-10）$（1-10）$ MEV用于Fermion DM案例。甚至更轻的深色希格斯$ ϕ $在DM Relic密度计算中起重要作用：标量DM（$ x $）（$ x $）和$ X^\ rightArrow z'ϕ $（$ x $）和$χ\barχ\ rightarrow \ rightArrow ϕ $ for fermion dm（$χ$）假设$ m_ $ m_ c $ __ $ __ $他们俩都处于$ p $ - 波浪的an灭中，并且假设其他危险的$ s $ - 波浪nih灭是在$ s $ wave andihilation上的普朗克数据中的严格范围。
Recently XENON1T Collaboration announced that they observed some excess in the electron recoil energy around a 2-3 keV. We show that this excess can be interpreted as exothermic scattering of excited dark matter (XDM), $XDM + e_{atomic} \rightarrow DM + e_{free}$ on atomic electron through dark photon exchange. We consider DM models with local dark $U(1)$ gauge symmetry that is spontaneously broken into its $Z_2$ subgroup by Krauss-Wilczek mechanism. In order to explain the XENON1T excess with the correct DM thermal relic density within freeze-out scenario, all the particles in the dark sector should be light enough, namely $\sim O(100)$ MeV for scalar DM and $\sim O(1-10)$ MeV for fermion DM cases. And even lighter dark Higgs $ϕ$ plays an important role in the DM relic density calculation: $X X^\dagger \rightarrow Z' ϕ$ for scalar DM ($X$) and $χ\barχ \rightarrow ϕϕ$for fermion DM ($χ$) assuming $m_{Z'} > m_χ$. Both of them are in the $p$-wave annihilation, and one can easily evade stringent bounds from Planck data on CMB on the $s$-wave annihilations, assuming other dangerous $s$-wave annihilations are kinematically forbidden.
