Development and prospects of neutrinoless double-beta decay experiments

Neutrinoless double-beta decay is an important physics topic beyond the Standard Model. Based on decades of theoretical and experimental research, a somewhat full understanding of its possible physical mechanism and the experimental technical requirements have been established. Many groups worldwide are attempting to detect neutrinoless double-beta decay events using various detection techniques, and have given a lower half-life limit of 10²⁶ years. Now, the next generation of experimental facilities are being appraised or are under construction, with the aim to improve the halflife sensitivity to above 10²⁷ years. The China Jinping Underground Laboratory (CJPL), a world-leading ultralow background facility, provides many different kinds of detection techniques. This paper will review the current status of the major facilities worldwide conducting neutrinoless double-beta decay experiments, including the prospects of such experiments in CJPL,which will be based on various detection schemes.