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arXiv 2205.09484hep-phhep-exnucl-exnucl-th
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Dresden-II和COHERENT中微子散射数据对中微子电磁性质和电弱物理的影响

Impact of the Dresden-II and COHERENT neutrino scattering data on neutrino electromagnetic properties and electroweak physics

M. Atzori Corona, M. Cadeddu, N. Cargioli, F. Dordei, C. Giunti, Y. F. Li, C. A. Ternes, Y. Y. Zhang

摘要:

相干弹性中微子-核散射(CE $ν$ NS)是研究关键电弱物理参数和中微子性质的有力工具,自2017年在橡树岭国家实验室利用spiral中子源的COHERENT实验首次观测以来。鉴于最近检测到这样一个过程与反中微子产生的德累斯顿-II反应堆散射锗探测器,我们重新审视迄今为止设置的中微子磁矩,电荷半径和毫荷以及弱混合角的限制。为了做到这一点,我们还包括弹性中微子-电子散射的贡献,其影响变得不可忽略的一些超越标准模型的理论。通过使用不同的假设的锗淬灭因子和反应堆反中微子通量,我们提供了一个测量弱混合角在低能量尺度的德累斯顿-II反应堆实验,并与最新的碘化铯和氩的数据集由COHERENT协作发布的综合分析,我们提供更新的中微子电磁特性的限制。有趣的是,我们能够设置一个新的最佳上限的电子中微子电荷半径和显着改善其他CE $ν$ NS相关的限制中微子电荷和磁矩。

英文摘要:

Coherent elastic neutrino-nucleus scattering (CE$ν$NS) represents a powerful tool to investigate key electroweak physics parameters and neutrino properties since its first observation in 2017 by the COHERENT experiment exploiting the spallation neutron source at Oak Ridge National Laboratory. In light of the recent detection of such a process with antineutrinos produced by the Dresden-II reactor scattering off a germanium detector, we revisit the limits so far set on the neutrino magnetic moments, charge radii and millicharges as well as on the weak mixing angle. In order to do so, we also include the contribution of elastic neutrino-electron scattering, whose effect becomes non negligible in some beyond the Standard Model theories. By using different hypotheses for the germanium quenching factor and the reactor antineutrino flux, we provide a measurement of the weak mixing angle at the low-energy scale of the Dresden-II reactor experiment and, thanks to a combined analysis with the latest cesium iodide and argon data set released by the COHERENT Collaboration, we deliver updated limits for the neutrino electromagnetic properties. Interestingly, we are able to set a new best upper limit on the electron neutrino charge radius and significantly improve the other CE$ν$NS-related limits on the neutrino electric charge and magnetic moment.

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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