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arXiv 2312.08970hep-phastro-ph.HE
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在 Belle II 上寻找强相互作用暗物质

Search for strongly interacting dark matter at Belle II

Jinhan Liang, Zuowei Liu, Lan Yang

AI总结:

本文研究 Belle II 对 MeV–GeV 质量、与电子强耦合暗物质的探测能力,计算单光子、单簇射和双簇射通道的排除区,表明其可补充直接探测与中微子实验约束。

摘要:

暗物质(DM)中一个与标准模型部分发生强相互作用的小组分,与多种实验观测结果相符。尽管其丰度很小,强相互作用暗物质仍可在暗物质直接探测实验中产生显著信号。我们研究了 Belle II 对质量处于 MeV–GeV 区间并与电子耦合的强相互作用暗物质的灵敏度。通过考虑探测器内暗物质与电子之间的大量相互作用,我们计算了 Belle II 单光子特征的“天花板”;超过该界限后,单光子通道将失去灵敏度,而由暗物质散射导致的可见 ECL 簇射将变得重要。我们研究了强相互作用暗物质的两种 ECL 特征:单簇射通道和双簇射通道。为了进行详细计算并与其他约束进行比较,我们考虑了具有轻媒介子的暗物质模型,因为这类模型自然会产生可观的相互作用截面。我们计算了双簇射、单簇射和单光子通道的排除区域。我们发现,对于媒介子质量 ≳10 MeV 的矢量媒介子情形,Belle II(利用目前已积累的 362 fb⁻¹ 数据)可以排除各种暗物质直接探测和中微子实验约束天花板之上的很大一部分参数空间。对于标量媒介子质量 ≳10 MeV 的情形,与 PBH 相比,Belle II 还对新型轻粒子提供了更优的约束。

英文摘要:

A small component of dark matter (DM) that is strongly interacting with the standard model sector is consistent with various experimental observations. Despite the small abundance, strongly-interacting DM can lead to pronounced signals in DM direct detection experiments. We study Belle II sensitivity on strongly-interacting DM that has a MeV-GeV mass and couples with electrons. By taking into account the substantial interactions between DM and electrons within detectors, we compute the ``ceiling'' of the mono-photon signature at Belle II, beyond which the mono-photon channel loses its sensitivity, and visible ECL clusters due to DM scatterings assume significance. We study two ECL signatures for strongly-interacting DM: the mono-cluster and the di-cluster channels. To carry out detailed calculations and to compare with other constraints, we consider DM models with light mediators, as they naturally lead to sizable interaction cross sections. We compute exclusion regions for the di-cluster, mono-cluster, and mono-photon channels. We find that Belle II (with currently accumulated data of 362 fb$^{-1}$) can rule out a significant portion of the parameter space above the ceilings of the constraints from various DM direct detection and neutrino experiments, for the vector mediator case with mass $\gtrsim 10$ MeV. Belle II also offers superior constraints on new light particles compared to PBH for the scalar mediator with mass $\gtrsim 10$ MeV.

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