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Liventsev, D; Aihara, H; Ayad, R; Babu, V; Banerjee, Sw; Belous, K; Bessner, M; Bilka, T; Bodrov, D; Bozek, A; Campajola, M; Chang, M-C; Chen, A; Cheon, B G; Cho, H E; Cho, K; Choi, S-K; Choi, Y; Choudhury, S; Das, S; De Pietro, G; Dhamija, R; Di Capua, F; Dong, T V; Epifanov, D; Ferlewicz, D; Giri, A; Goldenzweig, P; Gu, T; Hara, T; Hayashii, H; Inami, K; Ishikawa, A; Jang, E-J; Jin, Y; Kang, K H; Kiesling, C; Kim, C H; Kim, Y-K; Korpar, S; Kovalenko, E; Krokovny, P; Kumar, M; Kumara, K; Lam, T; Lange, J S; Li, L K; Li, Y; Libby, J; Lieret, K; Luo, T; Matsuda, T; Merola, M; Metzner, F; Mussa, R; Nakamura, I; Nakano, T; Nakao, M; Natkaniec, Z; Natochii, A; Nayak, M; Nishida, S; Oskin, P; Pakhlov, P; Paul, S; Pedlar, T K; Piilonen, L E; Prencipe, E; Prim, M T; Rostomyan, A; Russo, G; Sandilya, S; Santelj, L; Schnell, G; Schueler, J; Senyo, K; Shapkin, M; Sharma, C; Shen, C P; Shwartz, B; Sokolov, A; Solovieva, E; Sutcliffe, W; Takizawa, M; Uchida, M; Uehara, S; Uno, S; Usov, Y; van Tonder, R; Vinokurova, A; Wang, M-Z; Wang, X L; Watanabe, M; Watanuki, S; Werbycka, O; Won, E; Xu, X; Yuan, L; Zhang, Z P; Zhilich, V
Physical review letters, 11/2023, Volume: 131, Issue: 21Journal Article
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.
