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

Y. F. Liang; L. T. Yang; Q. Yue; K. J. Kang; Y. J. Li; H. P. An; Greeshma C.; J. P. Chang; H. Chen; Y. H. Chen; J. P. Cheng; J. Y. Cui; W. H. Dai; Z. Deng; Y. X. Dong; C. H. Fang; H. Gong; Q. J. Guo; T. Guo; X. Y. Guo; L. He; J. R. He; H. X. Huang; T. C. Huang; S. Karmakar; Y. S. Lan; H. B. Li; H. Y. Li; J. M. Li; J. Li; M. C. Li; Q. Y. Li; R. M. J. Li; X. Q. Li; Y. L. Li; B. 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; H. Pan; N. C. Qi; J. Ren

doi:10.1103/cyyp-7w7g

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

High Energy Physics - Experiment 2026-01-01 v2 High Energy Physics - Phenomenology Instrumentation and Detectors

Authors: Y. F. Liang , L. T. Yang , Q. Yue , K. J. Kang , Y. J. Li , H. P. An , Greeshma C. , J. P. Chang , H. Chen , Y. H. Chen , J. P. Cheng , J. Y. Cui , W. H. Dai , Z. Deng , Y. X. Dong , C. H. Fang , H. Gong , Q. J. Guo , T. Guo , X. Y. Guo , L. He , J. R. He , H. X. Huang , T. C. Huang , S. Karmakar , Y. S. Lan , H. B. Li , H. Y. Li , J. M. Li , J. Li , M. C. Li , Q. Y. Li , R. M. J. Li , X. Q. Li , Y. L. Li , B. 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 , H. Pan , N. C. Qi , J. Ren , X. C. Ruan , M. B. Shen , H. Y. Shi , M. K. Singh , T. X. Sun , W. L. Sun , C. J. Tang , Y. Tian , H. F. Wan , G. F. Wang , J. Z. Wang , L. Wang , Q. Wang , Q. Wang , Y. F. Wang , Y. X. Wang , H. T. Wong , Y. C. Wu , H. Y. Xing , K. Z. Xiong , R. Xu , Y. Xu , T. Xue , Y. L. Yan , N. Yi , C. X. Yu , H. J. Yu , X. Yu , M. Zeng , Z. Zeng , F. S. Zhang , P. Zhang , P. Zhang , Z. Y. Zhang , M. G. Zhao , J. F. Zhou , Z. Y. Zhou , J. J. Zhu

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Abstract

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 $m_\chi$ 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.

Keywords

wimp dark matter dark matter detection precision measurements in physics

Cite

@article{arxiv.2510.07800,
  title  = {Constraints on inelastic dark matter from the CDEX-1B experiment},
  author = {Y. F. Liang and L. T. Yang and Q. Yue and K. J. Kang and Y. J. Li and H. P. An and Greeshma C. and J. P. Chang and H. Chen and Y. H. Chen and J. P. Cheng and J. Y. Cui and W. H. Dai and Z. Deng and Y. X. Dong and C. H. Fang and H. Gong and Q. J. Guo and T. Guo and X. Y. Guo and L. He and J. R. He and H. X. Huang and T. C. Huang and S. Karmakar and Y. S. Lan and H. B. Li and H. Y. Li and J. M. Li and J. Li and M. C. Li and Q. Y. Li and R. M. J. Li and X. Q. Li and Y. L. Li and B. Liao and F. K. Lin and S. T. Lin and J. X. Liu and R. Z. Liu and S. K. Liu and Y. D. Liu and Y. Liu and Y. Y. Liu and H. Ma and Y. C. Mao and A. Mureed and H. Pan and N. C. Qi and J. Ren and X. C. Ruan and M. B. Shen and H. Y. Shi and M. K. Singh and T. X. Sun and W. L. Sun and C. J. Tang and Y. Tian and H. F. Wan and G. F. Wang and J. Z. Wang and L. Wang and Q. Wang and Q. Wang and Y. F. Wang and Y. X. Wang and H. T. Wong and Y. C. Wu and H. Y. Xing and K. Z. Xiong and R. Xu and Y. Xu and T. Xue and Y. L. Yan and N. Yi and C. X. Yu and H. J. Yu and X. Yu and M. Zeng and Z. Zeng and F. S. Zhang and P. Zhang and P. Zhang and Z. Y. Zhang and M. G. Zhao and J. F. Zhou and Z. Y. Zhou and J. J. Zhu},
  journal= {arXiv preprint arXiv:2510.07800},
  year   = {2026}
}

Comments

10 pages, 8 figures. Version updated to match PRD version

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

Abstract

Keywords

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