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arXiv 1502.00508hep-ph
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偶然暗物质:标度不变局域$B-L$模型中的情形

Accidental Dark Matter: Case in the Scale Invariant Local $B-L$ Models

Jun Guo, Zhaofeng Kang, P. Ko, Yuta Orikasa

摘要:

我们探讨了尺度不变局域$U(1)_{B-L}$模型中偶然暗物质(aDM)稳定性的概念,该模型是中微子理论,同时通过$U(1)_{B-L}$扇区中的量子力学动力学辐射性地打破了尺度不变性.一个真正的单重标量可以是一个偶然的DM与一个偶然的$Z_2$,凭借这两个扩展的对称性。$U(1)_{B-L}$带电复数标量也可以是由于偶然(或回复)$Z_3$而产生的可行偶然DM。它们可以通过常规希格斯门或暗希格斯门的湮灭来再现正确的遗迹密度。黑暗的希格斯门场景与$Z_{B-L}$上的LHC束缚处于紧张状态,只有几个TeV的重DM才能有正确的遗迹密度。特别是,DM可能会触发自发打破标度不变性(SISB)。在$Z_3$情况下,由于有效的半湮灭模式,这种情况明显放松,然后可以容易地容纳光DM。此外,$Z_3$模型还可以容纳来自星系中心(GC)的GeV量级的$γ-$射线过剩,这些射线通过半湮灭转化为赝戈德斯通玻色子(PGSB)。最佳拟合是在DM约52 GeV,湮没截面与热遗迹密度一致。不可见的希格斯分支比可以忽略不计,因为希格斯门的四次耦合是非常小的$λ_{hϕ} \lesssim 10^{-3}$。

英文摘要:

We explore the idea of accidental dark matter (aDM) stability in the scale invariant local $U(1)_{B-L}$ model, which is a theory for neutrino and at the same time radiatively breaks scale invariance via quantum mechanical dynamics in the $U(1)_{B-L}$ sector. A real singlet scalar can be accidental DM with an accidental $Z_2$, by virtue of both extended symmetries. A $U(1)_{B-L}$ charged complex scalar can also be a viable accidental DM due to an accidental (or remanent) $Z_3$. They can reproduce correct relic density via the annihilations through the conventional Higgs portal or dark Higgs portal. The dark Higgs portal scenario is in tension with the LHC bound on $Z_{B-L}$, and only heavy DM of a few TeVs can have correct relic density. In particular, DM may trigger spontaneous breaking of scale Invariance (SISB). The situation is relaxed significantly in the $Z_3$ case due to the effective semi-annihilation mode and then light DM can be accommodated easily. In addition, the $Z_3$ model can accommodate the GeV scale $γ-$ray excess from the galactic center (GC) via semi-annihilation into pseudo Goldstone boson (PGSB). The best fit is achieved at a DM about 52 GeV, with annihilation cross section consistent with the thermal relic density. The invisible Higgs branching ratio is negligible because the Higgs portal quartic coupling is very small $λ_{hϕ} \lesssim 10^{-3}$.

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