Direct Detection Constraints on Dark Photons with the CDEX-10 Experiment at the China Jinping Underground Laboratory
Z. She, Lingpu Jia, Qian Yue, Hao Ma, K. Kang, Y. J. Li, M. Ağartıoğlu, Haipeng An, Jianping Chang, C. H. Cheng, Y. H. Chen, Jianping Cheng, W. H. Dai, Z. Deng, X. P. Geng, Hao Gong, Peijun Gu, Q. J. Guo, X. Y. Guo, Long He, S. M. He, H. T. He, J. Hu, T. C. Huang, Han‐Xiong Huang, H. B. Li, H. Li, Junzhen Li, J. Li, M. X. Li, X. Li, X. Q. Li, Yan Li, Bin Liao, F. K. Lin, S. T. Lin, S. K. Liu, Y. D. Liu, Y. Y. Liu, Ziyi Liu, Y. C. Mao, Q. Y. Nie, J. H. Ning, H. Pan, Ningchun Qi, Chen-Kai Qiao, J. Ren, Xichao Ruan, B. Sevda, C. S. Shang, V. Sharma, L. Singh, M. K. Singh, T. X. Sun, C. J. Tang, W. Y. Tang, Y. Tian, G. F. Wang, L. Wang, Qing Wang, Y. Wang, Y. X. Wang, Zhimin Wang, H. T. Wong, Yongcheng Wu, Haoyang Xing, Y. Xu, Tao Xue, Y. L. Yan, L. T. Yang, Yi Nan, C. X. Yu, H. J. Yu, J. F. Yue, M. Zeng, Zhi Zeng, B. T. Zhang, L. Zhang, F. S. Zhang, Z. Y. Zhang, M. G. Zhao, J. F. Zhou, Z. Y. Zhou, J. J. Zhu
Abstract
We report constraints on the dark photon effective kinetic mixing parameter ($\ensuremath{\kappa}$) with data taken from two $p$-type point-contact germanium detectors of the CDEX-10 experiment at the China Jinping Underground Laboratory. The 90% confidence level upper limits on $\ensuremath{\kappa}$ of solar dark photon from 205.4 kg-day exposure are derived, probing new parameter space with masses (${m}_{V}$) from 10 to $300\text{ }\text{ }\mathrm{eV}/{c}^{2}$ in direct detection experiments. Considering dark photon as the cosmological dark matter, limits at 90% confidence level with ${m}_{V}$ from 0.1 to $4.0\text{ }\text{ }\mathrm{keV}/{c}^{2}$ are set from 449.6 kg-day data, with a minimum of $\ensuremath{\kappa}=1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ at ${\mathrm{m}}_{\mathrm{V}}=200\text{ }\text{ }\mathrm{eV}/{\mathrm{c}}^{2}$.