中微子层:数据驱动的分析

D. Papoulias
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摘要

根据最近对相干弹性中微子-原子核散射过程的测量,我们重新考虑了多吨直接探测暗物质实验的发现极限。假设横截面是一个完全由数据决定的参数,而不是使用其标准模型预测,我们使用COHERENT CsI和LAr数据集来确定WIMP的发现限制。基于数据驱动的方法,因此结果不受理论假设的约束,并且落在WIMP质量区域内,而XENONnT和DARWIN具有最佳的预期灵敏度。我们进一步确定了次导核形状因子和弱混合角不确定性对WIMP发现极限的影响。我们指出,这些影响虽然很小,但应该加以考虑。此外,为了量化中微子背景中新物理效应的影响,我们重新审视了WIMP的发现限制,假设光矢量和标量介质以及中微子磁矩/跃迁。我们强调,一般来说,中微子扇区中新的相互作用的存在往往会使WIMP的发现极限恶化。
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The neutrino floor: a data-driven analysis
We reconsider the discovery limit of multi-ton direct detection dark matter experiments in the light of recent measurements of the coherent elastic neutrino-nucleus scattering process. Assuming the cross section to be a parameter entirely determined by data, rather than using its Standard Model prediction, we use the COHERENT CsI and LAr data sets to determine WIMP discovery limits. Being based on a data-driven approach, the results are thus free from theoretical assumptions and fall within the WIMP mass regions where XENONnT and DARWIN have best expected sensitivities. We further determine the impact of subleading nuclear form factor and weak mixing angle uncertainties effects on WIMP discovery limits. We point out that these effects, albeit small, should be taken into account. Moreover, to quantify the impact of new physics effects in the neutrino background, we revisit WIMP discovery limits assuming light vector and scalar mediators as well as neutrino magnetic moments/transitions. We stress that the presence of new interactions in the neutrino sector, in general, tend to worsen the WIMP discovery limit.
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