标题： 从CDEX-1B实验中对非弹性暗物质的约束 显示英文标题

标题： Constraints on inelastic dark matter from the CDEX-1B experiment

摘要： 我们使用来自CDEX-1B实验的737.1 kg $\cdot$ day数据集，给出了自旋无关的非弹性WIMP-核子散射的限制。 在标准晕模型下，计算了各种非弹性WIMP质量 $m_\chi$ 和质量分裂 $\delta$ 的预期核反冲谱。 通过模拟所有主要背景源，构建了CDEX-1B的精确背景模型。 然后通过最大似然估计和马尔可夫链蒙特卡罗拟合确定模型参数。 在WIMP核子散射截面的90%置信度上限$\sigma_{\mathrm{n}}$排除了一些DAMA/LIBRA允许的区域：对于$\chi^2 < 4$区域，在$\delta < 30$keV 时为$m_\chi = 250$GeV，以及对于$\chi^2 < 9$区域，在$\delta < 50$keV 时为$m_\chi = 500$GeV。 该方法适用于其他非弹性暗物质情景，即将进行的CDEX-50实验预计灵敏度将提高四个数量级。 显示英文摘要

摘要： We present limits on spin-independent inelastic WIMP-nucleus scattering using the 737.1 kg $\cdot$ day dataset from the CDEX-1B experiment. Expected nuclear recoil spectra for various inelastic WIMP masses $m_\chi$ and mass splittings $\delta$ are calculated under the standard halo model. An accurate background model of CDEX-1B is constructed by simulating all major background sources. The model parameters are then determined through maximum likelihood estimation and Markov Chain Monte Carlo fitting. The resulting 90\% confidence level upper limits on the WIMP-nucleon cross section $\sigma_{\mathrm{n}}$ exclude certain DAMA/LIBRA allowed regions: the $\chi^2 < 4$ regions for $\delta < 30$ keV at $m_\chi = 250$ GeV and the $\chi^2 < 9$ region for $\delta < 50$ keV at $m_\chi = 500$ GeV. The method is applicable to other inelastic dark matter scenarios, and the upcoming CDEX-50 experiment is expected to improve sensitivity by four orders of magnitude.