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arXiv 1706.08029hep-phhep-th
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无极暗物质湮灭成光子

Anapole dark matter annihilation into photons

David C. Latimer

摘要:

在阿纳普尔暗物质(DM)模型中,DM候选者是马约拉纳费米子,其与标准模型(SM)粒子的主要相互作用是通过阿纳普尔耦合到离壳光子。因此,在树能级,anapole DM经历p波湮灭SM带电费米子通过虚光子。但是,一般来说,马约拉纳费米子是可极化的,耦合到两个真实的光子。这一事实承认,在s波过程中,阿那普尔DM可以湮灭为两个光子。使用一个明确的模型,我们计算了树级和双光子的贡献的anapole DM湮没截面。取决于模型参数,s波过程可以与p波对全湮灭截面的贡献相媲美或相形见绌。服从天体物理上的s波湮灭模式的上限模型,我们排除了大的s波湮灭模型。

英文摘要:

In models of anapole dark matter (DM), the DM candidate is a Majorana fermion whose primary interaction with standard model (SM) particles is through an anapole coupling to off-shell photons. As such, at tree-level, anapole DM undergoes p-wave annihilation into SM charged fermions via a virtual photon. But, generally, Majorana fermions are polarizable, coupling to two real photons. This fact admits the possibility that anapole DM can annihilate into two photons in an s-wave process. Using an explicit model, we compute both the tree-level and diphoton contributions to the anapole DM annihilation cross section. Depending on model parameters, the s-wave process can either rival or be dwarfed by the p-wave contribution to the total annihilation cross section. Subjecting the model to astrophysical upper bounds on the s-wave annihilation mode, we rule out the model with large s-wave annihilation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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