最小辐射跷跷板能否解释LZ 248 keV事件？
Can a minimal radiative seesaw explain the LZ 248 keV event?
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中文总结 AI 辅助
本文用最小Scotogenic模型结合隐藏U(1)_X对称性，通过非弹性散射和共湮灭解释LZ 248 keV事件，并解决IceCube冲突，提供可检验的暗物质方案。
中文摘要 AI 辅助
我们通过最小Scotogenic模型中的非弹性暗物质散射，解释了LUX-ZEPLIN（LZ）实验中最近报道的248 keV核反冲事件。中性惰性标量之间亚MeV的质量劈裂抑制了低能散射，同时允许来自高速晕尾的信号。关键在于，与近乎简并的右手费米子的共湮灭，能够容纳质量高达约O(1) TeV的暗物质的热 relic 密度，将可行范围显著扩展到纯惰性双态模型极限之外，同时规避了直接探测约束。然而，为了解决与IceCube中微子太阳俘获限制的严重冲突，我们通过引入一个隐藏的U(1)_X规范对称性来扩展这一最小框架，该对称性自然导致在一圈水平上产生微小的λ_5耦合。这实现了一个同位旋破坏的情景，抑制了太阳中暗物质的俘获，同时保留了基于氙的LZ探测器中的相干散射信号。我们数值验证了该扩展框架自然产生中微子质量，并满足大爆炸核合成和间接探测的约束，为LZ异常提供了一个稳健且可检验的解决方案。
英文摘要
We interpret the recently reported 248~keV nuclear recoil event in the LUX-ZEPLIN (LZ) experiment via inelastic dark matter scattering within the minimal Scotogenic model. A sub-MeV mass splitting between neutral inert scalars suppresses low-energy scattering while permitting signals from the high-velocity halo tail. Crucially, co-annihilation with nearly degenerate right-handed fermions accommodates the thermal relic density for dark matter masses up to $\sim {\cal O} (1)$~TeV, extending the viable range significantly beyond the pure inert doublet model limit while evading direct detection bounds. However, to resolve the severe tension with IceCube neutrino limits on solar capture, we extend this minimal framework by introducing a hidden $U(1)_X$ gauge symmetry that naturally leads us to tiny $λ_5$ coupling at the one-loop level. This realizes an isospin-violating scenario that suppresses dark matter capture in the Sun while preserving the coherent scattering signal in the Xenon-based LZ detector. We numerically verify that this extended framework naturally generates neutrino masses and satisfies constraints from Big Bang Nucleosynthesis and indirect detection, providing a robust and testable solution to the LZ anomaly.
发表机构
- Henan Normal University（河南师范大学）
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