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arXiv 2402.16709hep-phhep-ex
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动量依赖的中微子电荷半径辐射修正对相干弹性中微子-核散射中中微子电荷半径测定的贡献

Momentum dependent flavor radiative corrections to the coherent elastic neutrino-nucleus scattering for the neutrino charge-radius determination

M. Atzori Corona, M. Cadeddu, N. Cargioli, F. Dordei, C. Giunti

AI总结:

本文研究了CE$ν$NS中考虑中微子电荷半径时非零动量转移效应的辐射修正,重新分析实验数据表明该修正虽小但不可忽略,有助于提高电荷半径测定精度。

摘要:

中微子虽然是中性粒子,但可以具有非零的电磁电荷半径,这是标准模型理论中唯一的非零中微子电磁性质。其值可以被高精度预测,其效应通常通过影响低能下中微子与电子及核子耦合的辐射修正定义来考虑,这实际上导致弱混合角的偏移。有趣的是,它在截面中引入了味依赖性。利用现有的中微子-电子散射和相干弹性中微子-核散射(CE$ν$NS)数据,已有许多实验测量中微子电荷半径的尝试。遗憾的是,目前的精度仅能确定其值的约束。在本工作中,我们讨论了如何在CE$ν$NS截面中正确考虑中微子电荷半径,包括中微子电磁形状因子中非零动量转移的效应,这些效应在推导上述约束时通常被忽略。我们将所讨论的形式体系应用于COHERENT碘化铯和氩样品以及Dresden-II核电站的NCC-1701锗数据的重新分析。我们量化了这一修正对CE$ν$NS截面的影响,并表明尽管该修正较小,但不能被忽略。对于未来高精度实验的数据分析,这一动量依赖性可被利用来显著减小中微子电荷半径测定所允许的值。

英文摘要:

Despite being neutral particles, neutrinos can have a non-zero charge radius, which represents the only non-null neutrino electromagnetic property in the standard model theory. Its value can be predicted with high accuracy and its effect is usually accounted for through the definition of a radiative correction affecting the neutrino couplings to electrons and nucleons at low energy, which results effectively in a shift of the weak mixing angle. Interestingly, it introduces a flavour-dependence in the cross-section. Exploiting available neutrino-electron and coherent elastic neutrino-nucleus scattering (CE$ν$NS) data, there have been many attempts to measure experimentally the neutrino charge radius. Unfortunately, the current precision allows one to only determine constraints on its value. In this work, we discuss how to properly account for the neutrino charge radius in the CE$ν$NS cross-section including the effects of the non-null momentum-transfer in the neutrino electromagnetic form factor, which have been usually neglected when deriving the aforementioned limits. We apply the formalism discussed to a re-analysis of the COHERENT cesium iodide and argon samples and the NCC-1701 germanium data from the Dresden-II nuclear power plant. We quantify the impact of this correction on the CE$ν$NS cross-section and we show that, despite being small, it can not be neglected in the analysis of data from future high-precision experiments. Furthermore, this momentum dependence can be exploited to significantly reduce the allowed values for the neutrino charge radius determination.

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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