Search for Majoron at the COMET experiment

Tianyu Xing(邢天宇)1,2† Chen Wu(吴琛)3‡ Han Miao(妙晗)1,2§ Haibo Li(李海波)1,2 Weiguo Li(李卫国)1,2 Ye Yuan(袁野)1,2 Yao Zhang(张瑶)1

1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2University of Chinese Academy of Sciences, Beijing 100049, China
3Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan

Chin.Phys.C 47 (2023) 013108
1/1/23
https://doi.org/10.1088/1674-1137/ac9897

A new Goldstone particle named Majoron is introduced in order to explain the origin of neutrino mass via some new physics models assuming that neutrinos are Majorana particles. By expanding the signal region and using likelihood analysis, it becomes possible to search for Majoron using experiments originally designed to search for µ− e µ → eJ conversion. For the COMET experiment, the sensitivity of process is able to reach B(µ → eJ)= 2.3 × 10−5 in Phase-I and O(10−8) in Phase-II. Meanwhile, the sensitivities to search for Majoron in future experiments are also discussed in this article.

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