Search for neutrinoless quadruple beta decay of ¹³⁶Xe in PandaX-4T detector

@misc{collaboration2026search,
  title = {{Search for neutrinoless quadruple beta decay of $^136$Xe in PandaX-4T detector}},
  author = {PandaX Collaboration and Zhiyuan Li and Peiyuan Chen and Wei Chen and Xiaohua Chen and Xun Chen and Yunhua Chen and Chen Cheng and Xiangyi Cui and Yuxin Cui and Manna Deng and Roni Dey and Yingjie Fan and Deqing Fang and Xuanye Fu and Zhixing Gao and Yujie Ge and Lisheng Geng and Xunan Guo and Xuyuan Guo and Zichao Guo and Chencheng Han and Ke Han and Changda He and Jinrong He and Ruquan Hou and Houqi Huang and Junting Huang and Yule Huang and Xiangdong Ji and Yonglin Ju and Xiaorun Lan and Chenxiang Li and Mingchuan Li and Peiyuan Li and Shuaijie Li and Tao Li and Yangdong Li and Yuan Li and Qing Lin and Jianglai Liu and Yuanchun Liu and Yunyang Luo and Yugang Ma and Yajun Mao and Yue Meng and Binyu Pang and Ningchun Qi and Xiangxiang Ren and Dong Shan and Xiyuan Shao and Manbin Shen and Xuyan Sun and Yi Tao and Yueqiang Tian and Yuxin Tian and Anqing Wang and Guanbo Wang and Hao Wang and Haoyu Wang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.10048},
  eprint = {2609.10048},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.10048},
}

TY  - UNPB
TI  - Search for neutrinoless quadruple beta decay of ^136Xe in PandaX-4T detector
AU  - PandaX Collaboration
AU  - Zhiyuan Li
AU  - Peiyuan Chen
AU  - Wei Chen
AU  - Xiaohua Chen
AU  - Xun Chen
AU  - Yunhua Chen
AU  - Chen Cheng
AU  - Xiangyi Cui
AU  - Yuxin Cui
AU  - Manna Deng
AU  - Roni Dey
AU  - Yingjie Fan
AU  - Deqing Fang
AU  - Xuanye Fu
AU  - Zhixing Gao
AU  - Yujie Ge
AU  - Lisheng Geng
AU  - Xunan Guo
AU  - Xuyuan Guo
AU  - Zichao Guo
AU  - Chencheng Han
AU  - Ke Han
AU  - Changda He
AU  - Jinrong He
AU  - Ruquan Hou
AU  - Houqi Huang
AU  - Junting Huang
AU  - Yule Huang
AU  - Xiangdong Ji
AU  - Yonglin Ju
AU  - Xiaorun Lan
AU  - Chenxiang Li
AU  - Mingchuan Li
AU  - Peiyuan Li
AU  - Shuaijie Li
AU  - Tao Li
AU  - Yangdong Li
AU  - Yuan Li
AU  - Qing Lin
AU  - Jianglai Liu
AU  - Yuanchun Liu
AU  - Yunyang Luo
AU  - Yugang Ma
AU  - Yajun Mao
AU  - Yue Meng
AU  - Binyu Pang
AU  - Ningchun Qi
AU  - Xiangxiang Ren
AU  - Dong Shan
AU  - Xiyuan Shao
AU  - Manbin Shen
AU  - Xuyan Sun
AU  - Yi Tao
AU  - Yueqiang Tian
AU  - Yuxin Tian
AU  - Anqing Wang
AU  - Guanbo Wang
AU  - Hao Wang
AU  - Haoyu Wang
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2609.10048
UR  - https://arxiv.org/abs/2609.10048
AB  - The observation of neutrinoless quadruple beta decay (0ν4β) in the absence of neutrinoless double beta decay (0ν2β) has been argued to provide a strong indication that neutrinos are Dirac particles. We report a search for 0ν4β decay of ^136Xe using a total ^136Xe exposure of 148.4 kg·yr, collected during the commissioning and the first science runs of the PandaX-4T experiment. No significant excess of events over the background is observed. A lower limit on the 0ν4β decay half-life of ^136Xe is set at 6.01 x 10^24 yr at the 90% confidence level. This result establishes the most stringent constraint on this process in xenon, demonstrating the unique capability of the PandaX-4T detector in probing lepton number violation and shedding light on the fundamental nature of neutrinos.
ER  -