探测太阳$^8$B中微子雾的XENONnT
Probing the Solar $^8$B Neutrino Fog with XENONnT
AI总结：
XENONnT实验通过3.3σ测量太阳$^8$B中微子与核子的相干弹性散射，确定中微子通量并排除轻暗物质，同时提升对弱相互作用重子交叉截面的灵敏度。
摘要：
我们报告了使用XENONnT实验6.77吨·年曝光量，对来自太阳$^8$B中微子的相干弹性中微子-核子散射的3.3σ测量，推断出太阳$^8$B中微子通量为$(5_{-2}^{+3})\times 10^6\,\mathrm{cm}^{-2}\mathrm{s}^{-1}$，与之前的测量一致。在存在$^8$B“中微子雾”的情况下，我们未发现轻暗物质的证据，并观察到曝光量增加时灵敏度逐渐下降。与之前搜索相比，曝光量增加了93%，将中性弱相互作用重子与核子的交叉截面的中位灵敏度提高了10%。该数据集还用于测量弱混合角，在约0.02 GeV/$c$动量转移下，并约束超出标准模型的物理。
英文摘要：
We report a 3.3 $σ$ measurement of coherent elastic neutrino-nucleus scattering from solar $^8$B neutrinos using a 6.77 t$\times$yr exposure from the XENONnT experiment, inferring a solar $^8$B neutrino flux of $(5_{-2}^{+3})\times 10^6\,\mathrm{cm}^{-2}\mathrm{s}^{-1}$, consistent with previous measurements. In the presence of the $^8$B "neutrino fog", we find no evidence for light dark matter, and observe diminishing returns in sensitivity with increasing exposure. A 93% increase in exposure from the previous search improves the median sensitivity to the nucleon scattering cross section for a 5 GeV/$c^2$ spin-independent weakly interacting massive particle by 10%. The dataset was also used to measure the weak mixing angle at $\sim$ 0.02 GeV/$c$ momentum transfer and constrain physics beyond the Standard Model.
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