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arXiv 1507.04007hep-ph
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自相互作用暗物质与光介质的直接探测特征

Direct Detection Signatures of Self-Interacting Dark Matter with a Light Mediator

Eugenio Del Nobile, Manoj Kaplinghat, Hai-Bo Yu

摘要:

自相互作用暗物质(SIDM)是一个简单而动机良好的方案,可以解释长期存在的小尺度结构形成的难题。如果所需的自相互作用是通过暗区中的光介质(质量为$\sim 10$ MeV)产生的,那么这个新粒子必须是不稳定的,以避免过度封闭宇宙。光介质的衰减可能是由于隐藏和可见部分的弱耦合而发生的,为直接检测实验提供了新的特征。SIDM的核反冲光谱是更多的峰值向低能量相比,通常情况下的接触相互作用,因为介质质量是相当的动量转移的核反冲。我们表明,SIDM信号可以区分与DM粒子的接触相互作用,通过考虑在实验中采用不同的目标材料的时间平均能谱,或在一个单一的实验中的平均和调制的光谱。利用LUX和SuperCDMS的当前限制,我们还推导出隐藏和可见扇区之间的混合参数的强界。

英文摘要:

Self-interacting dark matter (SIDM) is a simple and well-motivated scenario that could explain long-standing puzzles in structure formation on small scales. If the required self-interaction arises through a light mediator (with mass $\sim 10$ MeV) in the dark sector, this new particle must be unstable to avoid overclosing the universe. The decay of the light mediator could happen due to a weak coupling of the hidden and visible sectors, providing new signatures for direct detection experiments. The SIDM nuclear recoil spectrum is more peaked towards low energies compared to the usual case of contact interactions, because the mediator mass is comparable to the momentum transfer of nuclear recoils. We show that the SIDM signal could be distinguished from that of DM particles with contact interactions by considering the time-average energy spectrum in experiments employing different target materials, or the average and modulated spectra in a single experiment. Using current limits from LUX and SuperCDMS, we also derive strong bounds on the mixing parameter between hidden and visible sector.

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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