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arXiv 1605.00611hep-phastro-ph.HEhep-ex
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s沟道内Higgsstrahlung的暗物质湮灭

Dark matter annihilation with s-channel internal Higgsstrahlung

Jason Kumar, Jiajun Liao, Danny Marfatia

摘要:

我们研究了费米子暗物质通过s通道轴向矢量介质湮灭为标准模型费米子的情形。我们指出,众所周知的手征性抑制的湮灭截面可以减轻s-通道内的Higgsstrahlung。在重介导粒子的极限下,宇宙线谱的形状与t-通道内Higgsstrahlung的形状相同。与一般的t-通道韧致辐射不同,s-通道Higgsstrahlung甚至可以是狄拉克暗物质的主要湮灭过程。由于s通道中介体可以是一个标准模型单态,碰撞器搜索的中介体很容易绕过。

英文摘要:

We study the scenario of fermionic dark matter that annihilates to standard model fermions through an s-channel axial vector mediator. We point out that the well-known chirality suppression of the annihilation cross section can be alleviated by s-channel internal Higgsstrahlung. The shapes of the cosmic ray spectra are identical to that of t-channel internal Higgsstrahlung in the limit of a heavy mediating particle. Unlike the general case of t-channel bremsstrahlung, s-channel Higgsstrahlung can be the dominant annihilation process even for Dirac dark matter. Since the s-channel mediator can be a standard model singlet, collider searches for the mediator are easily circumvented.

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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