Search for a heavy neutrino in $\tau$ decays at Belle

Physical Review Letters 131 (2023) 211802 We report on a search for a heavy neutrino in the decays $\tau^- \to \pi^- \nu_h$, $\nu_h \to \pi^\pm \ell-+$, $\ell = e, \mu$. The results are obtained using the full data sample collected with the Belle detector at the KEKB asymmetric energy $e^+e^-$ colli...

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Hauptverfasser: Adachi, I, Atmacan, H, Babu, V, Bauer, M, Behera, P, Bennett, J, Bessner, M, Biswas, D, Bonvicini, G, Borah, J, Browder, T. E, Budano, A, Červenkov, D, Chen, A, Cheon, B. G, Cho, H. E, Cho, S. -J, Cinabro, D, De Nardo, G, De Pietro, G, Doležal, Z, Dong, T. V, Dossett, D, Epifanov, D, Garg, R, Gaur, V, Giri, A, Gu, T, Gudkova, K, Hadjivasiliou, C, Han, X, Hedges, M. T, Herrmann, D, Villanueva, M. Hernández, Hsu, C. -L, Ipsita, N, Itoh, R, Kaliyar, A. B, Kang, K. H, Kawasaki, T, Kim, C. H, Kim, K. -H, Kodyš, P, Korobov, A, Korpar, S, Kovalenko, E, Križan, P, Kumar, R, Lam, T, Lange, J. S, Lewis, P, Li, L. K, Meier, F, Metzner, F, Miyabayashi, K, Mizuk, R, Nakano, T, Natkaniec, Z, Nayak, L, Nayak, M, Nisar, N. K, Ogawa, S, Pardi, S, Park, H, Passeri, A, Patra, S, Paul, S, Pedlar, T. K, Pestotnik, R, Podobnik, T, Prim, M. T, Russo, G, Sandilya, S, Sangal, A, Savinov, V, Schnell, G, Schueler, J, Schwanda, C, Seino, Y, Senyo, K, Sevior, M. E, Shen, C. P, Sumihama, M, Sutcliffe, W, Tamponi, U, Tenchini, F, Uchida, M, Uehara, S, Uno, S, Usov, Y, Varvell, K. E, Wang, X. L, Watanuki, S, Won, E, Yabsley, B. D, Yan, W, Yelton, J, Yin, J. H, Zhang, Z. P, Zhilich, V
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Zusammenfassung:Physical Review Letters 131 (2023) 211802 We report on a search for a heavy neutrino in the decays $\tau^- \to \pi^- \nu_h$, $\nu_h \to \pi^\pm \ell-+$, $\ell = e, \mu$. The results are obtained using the full data sample collected with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. We observe no significant signal and set 90% CL upper limits on the couplings of the heavy right-handed neutrinos to the conventional SM left-handed neutrinos in the mass range 0.2-1.6 GeV/c$^2$.
DOI:10.48550/arxiv.2212.10095