1. Search for a Heavy Neutrino in τ Decays at Belle.
- Author
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Liventsev D, Adachi I, Aihara H, Al Said S, Asner DM, Atmacan H, Ayad R, Babu V, Banerjee S, Bauer M, Behera P, Belous K, Bennett J, Bessner M, Bilka T, Biswas D, Bodrov D, Bonvicini G, Borah J, Bozek A, Bračko M, Branchini P, Browder TE, Budano A, Campajola M, Červenkov D, Chang MC, Chen A, Cheon BG, Cho HE, Cho K, Cho SJ, Choi SK, Choi Y, Choudhury S, Cinabro D, Das S, De Nardo G, De Pietro G, Dhamija R, Di Capua F, Doležal Z, Dong TV, Dossett D, Epifanov D, Ferber T, Ferlewicz D, Fulsom BG, Garg R, Gaur V, Giri A, Goldenzweig P, Graziani E, Gu T, Gudkova K, Hadjivasiliou C, Han X, Hara T, Hayasaka K, Hayashii H, Hedges MT, Herrmann D, Hernández Villanueva M, Hsu CL, Inami K, Ipsita N, Ishikawa A, Itoh R, Iwasaki M, Jacobs WW, Jang EJ, Jia S, Jin Y, Kaliyar AB, Kang KH, Kawasaki T, Kiesling C, Kim CH, Kim DY, Kim KH, Kim YK, Kodyš P, Korobov A, Korpar S, Kovalenko E, Križan P, Krokovny P, Kumar M, Kumar R, Kumara K, Kwon YJ, Lam T, Lange JS, Lee SC, Lewis P, Li LK, Li Y, Li Gioi L, Libby J, Lieret K, Lin YR, Luo T, Matsuda T, Matvienko D, Meier F, Merola M, Metzner F, Miyabayashi K, Mizuk R, Mohanty GB, Mussa R, Nakamura I, Nakano T, Nakao M, Natkaniec Z, Natochii A, Nayak L, Nayak M, Nisar NK, Nishida S, Ogawa S, Ono H, Oskin P, Pakhlov P, Pakhlova G, Pardi S, Park H, Park J, Passeri A, Patra S, Paul S, Pedlar TK, Pestotnik R, Piilonen LE, Podobnik T, Prencipe E, Prim MT, Rostomyan A, Rout N, Russo G, Sandilya S, Sangal A, Santelj L, Savinov V, Schnell G, Schueler J, Schwanda C, Seino Y, Senyo K, Sevior ME, Shapkin M, Sharma C, Shen CP, Shiu JG, Shwartz B, Simon F, Sokolov A, Solovieva E, Starič M, Sumihama M, Sumiyoshi T, Sutcliffe W, Takizawa M, Tamponi U, Tanida K, Tenchini F, Uchida M, Uehara S, Uno S, Usov Y, van Tonder R, Varner G, Varvell KE, Vinokurova A, Wang MZ, Wang XL, Watanabe M, Watanuki S, Werbycka O, Won E, Xu X, Yabsley BD, Yan W, Yang SB, Yelton J, Yin JH, Yuan CZ, Yuan L, Zhang ZP, Zhilich V, and Zhukova V
- Abstract
We report on a search for a heavy Majorana neutrino in the decays τ^{-}→π^{-}ν_{h}, ν_{h}→π^{±}ℓ^{∓}, ℓ=e, μ. The results are obtained using the full data sample of 988 fb^{-1} collected with the Belle detector at the KEKB asymmetric energy e^{+}e^{-} collider, which contains 912×10^{6} ττ pairs. We observe no significant signal and set 95% CL upper limits on the couplings of the heavy right-handed neutrinos to the conventional standard model left-handed neutrinos in the mass range 0.2-1.6 GeV/c^{2}. This is the first study of a mixed couplings of heavy neutrinos to τ leptons and light-flavor leptons.
- Published
- 2023
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