利用XENONnT仅电离数据探测太阳变色龙粒子
Probing Solar Chameleons with XENONnT Ionization-Only Data
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中文总结 AI 辅助
利用XENONnT仅电离数据首次搜索太阳变色龙粒子，将反冲能量阈值降至约0.04 keV，并给出畸形耦合上限log10β_eff<-3.64，开辟了测试屏蔽暗能量模型的新实验通道。
中文摘要 AI 辅助
屏蔽标量场提供了暗能量与实验室尺度新物理之间的一种可能联系，同时与现有的第五种力约束相容。太阳产生过程为这些模型提供了直接探测途径，而仅电离测量将液氙探测器的灵敏度扩展到亚千电子伏特能区。我们首次利用低能S2-only数据搜索太阳变色龙粒子，基于7.83吨·年的XENONnT仅电离数据集。预测的电子反冲谱通过依赖于运行时间的探测器响应进行折叠，并直接在修正后的S2（cS2）空间中检验。联合分箱似然函数结合了科学运行SR0、SR1和SR2的七个cS2箱。我们对五维参数空间$\{\beta_e,\beta_\gamma,M_e,\Lambda,n\}$进行采样，并推导出共形和畸形电子耦合的后验约束。数据将反冲能量探测范围扩展到约$0.04~{\rm keV}_{ee}$，在此能区必须显式建模少电子探测器响应和仪器本底。在畸形主导区域，结果以$\beta_{\rm eff}\equiv\beta_\gamma({\rm eV}/M_e)^4$表示。我们得到上限$\log_{10}\beta_{\rm eff}<-3.64$。尽管本分析达到了比我们之前的XENONnT电子反冲分析更低的能量阈值，但所得约束较弱，主要原因是畸形吸收率在低反冲能量下迅速下降，而本底率在该能区也变大。本分析确立了低能电离数据作为测试太阳变色龙粒子和屏蔽暗能量模型的新实验通道。
英文摘要
Screened scalar fields provide a possible connection between dark energy and laboratory-scale new physics while remaining compatible with existing fifth-force constraints. Solar production offers a direct probe of these models, and ionization-only measurements extend the sensitivity of liquid-xenon detectors into the sub-keV regime. We present the first search for solar chameleons using low-energy S2-only data, based on the 7.83 tonne-year XENONnT ionization-only data set. The predicted electronic-recoil spectrum is folded through the run-dependent detector response and tested directly in corrected-S2 (cS2) space. A joint binned likelihood combines the seven cS2 bins of science runs SR0, SR1, and SR2. We sample the five-dimensional parameter space $\{β_e,β_γ,M_e,Λ,n\}$ and derive posterior constraints on the conformal and disformal electron couplings. The data extend the recoil-energy reach to approximately $0.04~{\rm keV}_{ee}$, where the few-electron detector response and instrumental backgrounds must be modeled explicitly. In the disformal-dominated regime, the result is expressed in terms of $β_{\rm eff}\equivβ_γ({\rm eV}/M_e)^4$. We obtain the upper limit $\log_{10}β_{\rm eff}<-3.64$. Although the present analysis reaches a lower energy threshold than our previous XENONnT electronic-recoil analysis, the resulting constraint is weaker, primarily because the disformal absorption rate decreases rapidly toward low recoil energies, where the background rate also becomes larger. This analysis establishes low-energy ionization data as a new experimental channel for testing solar chameleons and screened dark-energy models.
发表机构
- University of Trento（特伦托大学）
- Trento Institute for Fundamental Physics and Applications (TIFPA)-INFN（特伦托基础物理与应用研究所（TIFPA）-意大利国家核物理研究所）
- University of Science and Technology of China（中国科学技术大学）
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