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arXiv 2504.02447hep-ph
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利用超新星中微子测量低能弱混合角

Measuring the Low-Energy Weak Mixing Angle with Supernova Neutrinos

Department of Physics and Institute of Theoretical Physics, The Chinese University of Hong Kong(香港中文大学物理系及理论物理研究所)

Chun-Ming Yip, Xu-Run Huang, Ming-chung Chu, Qishan Liu

AI总结:

本文提出利用未来吨级液氩暗物质探测器Argo结合附近超新星中微子通量,通过CE$ν$NS通道在低能区以百分之几精度测量弱混合角,为电弱理论精确检验和新物理寻找提供新途径。

摘要:

弱混合角 $θ_W$ 是电弱理论中的一个基本参数,其数值随能量标度而变化,其在低能区的精确测量仍在进行中。我们提出一种方法,利用 Argo——未来吨级液氩暗物质探测器——以及来自附近核坍缩超新星(CCSN)的中微子通量来测量低能 $\sin{^2θ_W}$。我们通过相干弹性中微子-原子核散射(CE$ν$NS)通道评估该测量的预期精度。我们表明,在观测到距地球约 3 kpc 以内的 CCSN 时,Argo 有潜力在动量转移 $q \sim 20$ MeV 处实现对 $\sin{^2θ_W}$ 的百分之几量级的测定。这样的测量对于电弱理论的精确检验以及在标准模型之外的中微子区寻找新物理都具有重要价值。

英文摘要:

The weak mixing angle $θ_W$ is a fundamental parameter in the electroweak theory with a value running according to the energy scale, and its precision measurement in the low-energy regime is still ongoing. We propose a method to measure the low-energy $\sin{^2θ_W}$ by taking advantage of Argo, a future ton-scale liquid argon dark matter detector, and the neutrino flux from a nearby core-collapse supernova (CCSN). We evaluate the expected precision of this measurement through the coherent elastic neutrino-nucleus scattering (CE$ν$NS) channel. We show that Argo is potentially capable of achieving a few percent determination of $\sin{^2θ_W}$, at the momentum transfer of $q \sim 20$ MeV, in the observation of a CCSN within $\sim 3$ kpc from the Earth. Such a measurement is valuable for both the precision test of the electroweak theory and searching for new physics beyond the standard model in the neutrino sector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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