Improved limits on solar axions and bosonic dark matter from the CDEX-1B experiment using the profile likelihood ratio method
Abstract
We present the improved constraints on couplings of solar axions and more generic bosonic dark matter particles using 737.1 kg-days of data from the CDEX-1B experiment. The CDEX-1B experiment, located at the China Jinping Underground Laboratory, primarily aims at the direct detection of weakly interacting massive particles using a p-type point-contact germanium detector. We adopt the profile likelihood ratio method for analysis of data in the presence of backgrounds. An energy threshold of 160 eV was achieved, much better than the 475 eV of CDEX-1A with an exposure of 335.6 kg-days. This significantly improves the sensitivity for the bosonic dark matter below 0.8 keV among germanium detectors. Limits are also placed on the coupling from Compton, bremsstrahlung, atomic-recombination and de-excitation channels and from a Fe M1 transition at 90\% confidence level.
Keywords
Cite
@article{arxiv.1911.03085,
title = {Improved limits on solar axions and bosonic dark matter from the CDEX-1B experiment using the profile likelihood ratio method},
author = {Y. Wang and Q. Yue and S. K. Liu and K. J. Kang and Y. J. Li and H. P. An and J. P. Chang and J. H. Chen and Y. H. Chen and J. P. Cheng and W. H. Dai and Z. Deng and X. P. Geng and H. Gong and P. Gu and X. Y. Guo and H. T. He and L. He and S. M. He and J. W. Hu and H. X. Huang and T. C. Huang and L. P. Jia and H. B. Li and H. Li and M. X. Li and J. M. Li and J. Li and X. Li and X. Q. Li and Y. L. Li and B. Liao and F. K. Lin and S. T. Lin and Y. D. Liu and Y. Y. Liu and Z. Z. Liu and H. Ma and Q. Y. Nie and J. H. Ning and H. Pan and N. C. Qi and C. K. Qiao and J. Ren and X. C. Ruan and V. Sharma and Z. She and L. Singh and M. K. Singh and T. X. Sun and C. J. Tang and W. Y. Tang and Y. Tian and G. F. Wang and L. Wang and Q. Wang and Z. Wang and H. T. Wong and S. Y. Wu and Y. C. Wu and H. Y. Xing and Y. Xu and T. Xue and Y. L. Yan and L. T. Yang and N. Yi and C. X. Yu and H. J. Yu and J. F. Yue and X. H. Zeng and M. Zeng and Z. Zeng and B. T. Zhang and F. S. Zhang and L. 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:1911.03085},
year = {2021}
}
Comments
version accepted by PRD, 9 pages, 11 figures