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arXiv 1402.2115hep-phhep-ex
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宇宙射线中正电子过剩的希格斯门衰变矢量暗物质的间接和直接特征

Indirect and direct signatures of Higgs portal decaying vector dark matter for positron excess in cosmic rays

Seungwon Baek, P. Ko, Wan-Il Park, Yong Tang

摘要:

我们调查的希格斯门$U(1)_X$矢量暗物质(VDM)$X_μ$从它的对湮灭和衰变的间接签名。VDM通过$Z_2$对称性稳定在可重整化水平,并通过希格斯门相互作用热化。在宇宙学时间尺度上,它也可以被一些寿命很长的不可重正化算符衰变。如果用$10^{16}$ GeV尺度抑制VDM衰变的dim-6算符,则质量为$\sim$ 2 TeV的VDM的寿命正好可以用来解释PAMELA和AMS 02合作组最近观测到的宇宙线中的正电子过剩现象.衰变为$μ^+ μ^-$的VDM能很好地拟合数据,避开了宇宙射线的各种约束。我们给出了一个UV完全模型作为例子。对于质量在$\sim2$ TeV左右的希格斯门衰变VDM的这种情况,可以通过在XENON 1 T和未来的对撞机上测量希格斯自耦合来进行DM直接搜索来测试。

英文摘要:

We investigate the indirect signatures of the Higgs portal $U(1)_X$ vector dark matter (VDM) $X_μ$ from both its pair annihilation and decay. The VDM is stable at renormalizable level by $Z_2$ symmetry, and thermalized by Higgs-portal interactions. It can also decay by some nonrenormalizable operators with very long lifetime at cosmological time scale. If dim-6 operators for VDM decays are suppressed by $10^{16}$ GeV scale, the lifetime of VDM with mass $\sim$ 2 TeV is just right for explaining the positron excess in cosmic ray recent observed by PAMELA and AMS02 Collaborations. The VDM decaying into $μ^+ μ^-$ can fit the data, evading various constraints on cosmic rays. We give one UV-complete model as an example. This scenario for Higgs portal decaying VDM with mass around $\sim2$ TeV can be tested by DM direct search at XENON1T and at the future colliders by measuring the Higgs self-couplings.

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