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arXiv 2409.04385hep-phastro-ph.SRhep-ex
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利用直接探测实验对弱混合角的首次约束

First constraint on the weak mixing angle using direct detection experiments

Tarak Nath Maity, Celine Boehm

AI总结:

本研究利用吨级暗物质直接探测实验的太阳中微子数据,首次在亚GeV及0.1 MeV等未被探索的低能区对标准模型关键参数弱混合角实现约束,为下一代实验在keV-MeV能区的精确测量奠定基础。

摘要:

当前吨级暗物质直接探测实验已通过探测太阳中微子达到了一个重要里程碑。本文中,我们证明这些数据可用于确定粒子物理标准模型的一个关键参数,且探测的能区是此前从未被探索过的。具体而言,我们表明与W玻色子和Z玻色子质量相关的弱混合角($θ_W$)的数值可从两方面推导得出:一是PandaX-4T和XENONnT近期在亚GeV能区对相干中微子-原子核散射的测量结果——该能区通常仅由低能中微子实验进行探测;二是XENONnT通过能量标度约为0.1 MeV的中微子-电子散射得到的电子反冲数据,其对应的动量转移区域比原子宇称不守恒实验探索的区域小一个数量级以上。既然在这些最低能前沿已经存在弱混合角的指示性测量,下一代此类实验的挑战将是在keV-MeV能区提供更精确的测量。

英文摘要:

Current ton-scale dark matter direct detection experiments have reached an important milestone with the detection of solar neutrinos. In this paper, we show that these data can be used to determine a critical parameter of the Standard Model in particle physics, across an energy regime that has never been probed before. In particular, we show that the value of the weak mixing angle ($θ_W$) which relates the mass of the $W$ and $Z$ bosons can be derived from 1) the recent measurements of coherent neutrino-nucleus scattering by PandaX-4T and XENONnT in the sub-GeV energy range -- a regime which is usually only probed by low energy neutrino experiments -- and from 2) XENONnT electron recoil data through neutrino-electron scattering at energy scale $\simeq 0.1 ~ \rm{ MeV}$, corresponding to a momentum transfer region over an order of magnitude smaller than that explored by atomic parity violation experiments. Now that an indicative measurement of the weak mixing angle exists at these lowest energy frontier, the challenge for the next generation of such experiments will be to provide a more precise measurement in the keV-MeV energy range.

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