arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.02768hep-phastro-ph.CO
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太阳中的暗物质:散射电子与核子

Dark matter in the Sun: scattering off electrons vs nucleons

Raghuveer Garani, Sergio Palomares-Ruiz

摘要:

积累在太阳中的暗物质(DM)粒子的湮灭可以产生中微子通量,这可能是中微子探测器/望远镜可以探测到的,并且DM弹性散射截面可以被限制。虽然像太阳这样的天体的DM捕获过程通常被认为是由于与核子的相互作用,但也有一些情况下,树级DM与夸克的耦合是不存在的,即使允许与核子的环诱导相互作用,电子的散射可能是主要的捕获机制。我们认为这种可能性和研究的详细计算中微子生产率DM湮灭在太阳(捕获,湮灭和蒸发率)的速度无关和各向同性,速度依赖和各向同性和动量依赖的散射截面DM与电子的相互作用,并将它们与核子的相互作用的情况下得到的结果进行比较。此外,我们改进了通常的计算方法,在三个附录中提供了解析表达式。有趣的是,我们发现在与电子相互作用的情况下,蒸发质量可能低于GeV范围,这取决于太阳DM分布的高速尾部,这将为搜索这种类型的场景打开一个新的质量窗口。

英文摘要:

The annihilation of dark matter (DM) particles accumulated in the Sun could produce a flux of neutrinos, which is potentially detectable with neutrino detectors/telescopes and the DM elastic scattering cross section can be constrained. Although the process of DM capture in astrophysical objects like the Sun is commonly assumed to be due to interactions only with nucleons, there are scenarios in which tree-level DM couplings to quarks are absent, and even if loop-induced interactions with nucleons are allowed, scatterings off electrons could be the dominant capture mechanism. We consider this possibility and study in detail all the ingredients necessary to compute the neutrino production rates from DM annihilations in the Sun (capture, annihilation and evaporation rates) for velocity-independent and isotropic, velocity-dependent and isotropic and momentum-dependent scattering cross sections for DM interactions with electrons and compare them with the results obtained for the case of interactions with nucleons. Moreover, we improve the usual calculations in a number of ways and provide analytical expressions in three appendices. Interestingly, we find that the evaporation mass in the case of interactions with electrons could be below the GeV range, depending on the high-velocity tail of the DM distribution in the Sun, which would open a new mass window for searching for this type of scenarios.

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