Accès ouvert déclaré
2025
preprint
Constraints on inelastic dark matter from the CDEX-1B experiment
Y. F. Liang, L. T. Yang, Qing Yue, K. Kang, Y. J. Li, Haipeng An, C. Greeshma, J. P. Chang, H. Chen, Y. H. Chen, J. P. Cheng, Jian Cui, W. H. Dai, Zhigang Deng, Yanbin Dong, C. H. Fang, H. Gong, Q. Guo, Tingting Guo, X. Y. Guo, Lianyi He, Jiguang He, H. X. Huang, T. C. Huang, S. Karmakar, Yingqi Lan, Hau-Bin Li, Haiying Li, J. M. Li, Junli Li, M. C. Li, Q. Y. Li, R. M. J. Li, X. Q. Li, Yulan Li, Bin Liao, F. K. Lin, S. T. Lin, J. X. Liu, R. Z. Liu, S. K. Liu, Y. D. Liu, Y. Liu, Y. Y. Liu, H. Ma, Y. C. Mao, A. Mureed, Haiwu Pan, Ningchun Qi, Jie Ren, Xichao Ruan, M. B. Shen, Huichao Shi, M. K. Singh, T. Sun, Wenliang Sun, C. J. Tang, Y. Tian, Hong Wan, G. F. Wang, Jian-Peng Wang, L. Wang, Q. Wang, Y. F. Wang, Yan Wang, H. T. Wong, Y. C. Wu, H. Xing, Kai Xiong, Renxin Xu, Y. Xu, T. Xue, Y. L. Yan, Yi Nan, C. X. Yu, Hao Yu, Yu Xia, Mao Zeng, Zhoumo Zeng, F. S. Zhang, P. Zhang, Z. Y. Zhang, M. G. Zhao, Jingchen Zhou, Z. Y. Zhou, J. J. Zhu
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Le résumé fourni par la source
We present limits on spin-independent inelastic weakly interacting massive particles (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 $m_χ$ and mass splittings $δ$ 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 $σ_{\mathrm{n}}$ exclude certain DAMA/LIBRA allowed regions: the $χ^2 < 4$ regions for $δ< 30$ keV at $m_χ= 250$ GeV and the $χ^2 < 9$ region for $δ< 50$ keV at $m_χ= 500$ 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.
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Les sujets associés
Dark Matter and Cosmic PhenomenaScientific Research and DiscoveriesCosmology and Gravitation Theories