arXiv 1509.040362015-09-14hep-ph

B-L模型中的标量暗物质

Scalar dark matter in the B-L model

Werner Rodejohann, Carlos E. Yaguna

备注：: 24 pages
DOI：: 10.1088/1475-7516/2015/12/032

摘要：

标准模型的B-L扩展要求右手中微子的存在，自然实现了中微子质量产生的跷跷板机制。我们研究的可能性解释的暗物质在这个模型中与一个额外的标量场，是一个单线态的标准模型，但收费下$U(1)_{B-L}$。这种情况的一个优点是，暗物质的稳定性可以通过适当地选择其B-L电荷来保证，而不需要额外的特设离散对称性。我们详细研究了这个模型的暗物质现象。我们发现，所观察到的暗物质密度可以通过规范或标量相互作用，并在后一种情况下，半湮灭可能发挥重要作用。在每种情况下都确定了与暗物质密度一致的区域，并分析了未来实验中的探测前景。如果暗物质湮灭是由B-L规范相互作用控制的，那么暗物质粒子的质量应该在5 TeV以下，它的直接探测截面可以很容易地被XENON 1 T探测到;如果它们是由标量相互作用控制的，那么暗物质的质量会大得多，探测前景就不那么确定了。最后，我们表明，这种情况下可以很容易地扩展到容纳多个暗物质粒子。

英文摘要：

The B-L extension of the Standard Model requires the existence of right-handed neutrinos and naturally realizes the seesaw mechanism of neutrino mass generation. We study the possibility of explaining the dark matter in this model with an additional scalar field that is a singlet of the Standard Model but charged under $U(1)_{B-L}$. An advantage of this scenario is that the stability of the dark matter can be guaranteed by appropriately choosing its B-L charge, without the need of an extra ad hoc discrete symmetry. We investigate in detail the dark matter phenomenology of this model. We show that the observed dark matter density can be obtained via gauge or scalar interactions, and that semi-annihilations could play an important role in the latter case. The regions consistent with the dark matter density are determined in each instance and the prospects for detection in future experiments are analyzed. If dark matter annihilations are controlled by the B-L gauge interaction, the mass of the dark matter particle should lie below 5 TeV and its direct detection cross section can be easily probed by XENON1T; if instead they are controlled by scalar interactions, the dark matter mass can be much larger and the detection prospects are less certain. Finally, we show that this scenario can be readily extended to accommodate multiple dark matter particles.

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