利用最新 COHERENT CsI 和原子宇称破缺 Cs 数据测量核中子半径与弱混合角
Nuclear neutron radius and weak mixing angle measurements from latest COHERENT CsI and atomic parity violation Cs data
AI总结：
该研究结合完整 COHERENT CsI 数据与原子宇称破缺结果，测定弱混合角及 Cs、I 中子半径，并评估理论振幅选择与未来低温 CsI 探测器前景。
摘要：
COHERENT 合作组于2017年使用一台14.6 kg的碘化铯（CsI）探测器观测到相干弹性中微子-原子核散射，并在该探测器退役前最近发表了更新结果。本文利用完整 CsI 数据集，并结合原子宇称破缺（APV）实验结果，给出对弱混合角以及 ^133Cs 和 ^127I 平均中子均方根半径的遗留测定；这一结合使精度达到约4.5%，并能够区分 ^133Cs 与 ^127I 原子核的贡献。有趣的是，我们表明 COHERENT CsI 数据以6σ证据显示核结构对完全相干性的抑制。此外，我们得到一种数据驱动的 APV+COHERENT 低能弱混合角测量，其不确定度为百分量级，并且不依赖于 ^133Cs 和 ^127I 平均中子均方根半径的取值；该半径在拟合中被允许自由变化。我们还广泛讨论了在 APV 拟合中使用两种不同理论宇称不守恒振幅测定结果的影响。研究发现，具体选择可造成显著差异，对 R_n(Cs) 的影响最高达6.5%，对弱混合角的影响最高达11%。最后，鉴于近期宣布未来将部署一台10 kg和一台约700 kg的低温 CsI 探测器，我们给出这些测量的未来前景，并将其与近期预计开展的其他具有竞争力的实验进行比较。
英文摘要：
The COHERENT collaboration observed coherent elastic neutrino nucleus scattering using a 14.6 kg cesium-iodide (CsI) detector in 2017 and recently published the updated results before decommissioning the detector. Here, we present the legacy determination of the weak mixing angle and of the average neutron rms radius of $^{133}\mathrm{Cs}$ and $^{127}\mathrm{I}$ obtained with the full CsI dataset, also exploiting the combination with the atomic parity violation (APV) experimental result, that allows us to achieve a precision as low as $\sim$4.5% and to disentangle the contributions of the $^{133}\mathrm{Cs}$ and $^{127}\mathrm{I}$ nuclei. Interestingly, we show that the COHERENT CsI data show a 6$σ$ evidence of the nuclear structure suppression of the full coherence. Moreover, we derive a data-driven APV+COHERENT measurement of the low-energy weak mixing angle with a percent uncertainty, independent of the value of the average neutron rms radius of $^{133}\mathrm{Cs}$ and $^{127}\mathrm{I}$, that is allowed to vary freely in the fit. Additionally, we extensively discuss the impact of using two different determinations of the theoretical parity non-conserving amplitude in the APV fit. Our findings show that the particular choice can make a significant difference, up to 6.5% on $R_n$(Cs) and 11% on the weak mixing angle. Finally, in light of the recent announcement of a future deployment of a 10 kg and a $\sim$700 kg cryogenic CsI detectors, we provide future prospects for these measurements, comparing them with other competitive experiments that are foreseen in the near future.
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