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arXiv · 2212.10095

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

Belle Collaboration·D. Liventsev·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·H. Atmacan·R. Ayad·V. Babu·Sw. Banerjee·M. Bauer·P. Behera·K. Belous·J. Bennett·M. Bessner·T. Bilka·D. Biswas·D. Bodrov·G. Bonvicini·J. Borah·A. Bozek·M. Bračko·P. Branchini·T. E. Browder·A. Budano·M. Campajola·D. Červenkov·M. -C. Chang·A. Chen·B. G. Cheon·H. E. Cho·K. Cho·S. -J. Cho·S. -K. Choi·Y. Choi·S. Choudhury·D. Cinabro·S. Das·G. De Nardo·G. De Pietro·R. Dhamija·F. Di Capua·Z. Doležal·T. V. Dong·D. Dossett·D. Epifanov·T. Ferber·D. Ferlewicz·B. G. Fulsom·R. Garg·V. Gaur·A. Giri·P. Goldenzweig·E. Graziani·T. Gu·K. Gudkova·C. Hadjivasiliou·X. Han·T. Hara·K. Hayasaka·H. Hayashii·M. T. Hedges·D. Herrmann·M. Hernández Villanueva·C. -L. Hsu·K. Inami·N. Ipsita·A. Ishikawa·R. Itoh·M. Iwasaki·W. W. Jacobs·E. -J. Jang·S. Jia·Y. Jin·A. B. Kaliyar·K. H. Kang·T. Kawasaki·C. Kiesling·C. H. Kim·D. Y. Kim·K. -H. Kim·Y. -K. Kim·P. Kodyš·A. Korobov·S. Korpar·E. Kovalenko·P. Križan·P. Krokovny·M. Kumar·R. Kumar·K. Kumara·Y. -J. Kwon·T. Lam·J. S. Lange·S. C. Lee·P. Lewis·L. K. Li·Y. Li·L. Li Gioi·J. Libby
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Abstract

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$^2$.

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Belle Collaboration, D. Liventsev, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, R. Ayad, V. Babu, Sw. Banerjee, M. Bauer, P. Behera, K. Belous, J. Bennett, M. Bessner, T. Bilka, D. Biswas, D. Bodrov, G. Bonvicini, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M. -C. Chang, A. Chen, B. G. Cheon, H. E. Cho, K. Cho, S. -J. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, D. Dossett, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, K. Gudkova, C. Hadjivasiliou, X. Han, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, D. Herrmann, M. Hernández Villanueva, C. -L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E. -J. Jang, S. Jia, Y. Jin, A. B. Kaliyar, K. H. Kang, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K. -H. Kim, Y. -K. Kim, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, M. Kumar, R. Kumar, K. Kumara, Y. -J. Kwon, T. Lam, J. S. Lange, S. C. Lee, P. Lewis, L. K. Li, Y. Li, L. Li Gioi, J. Libby. 2022-12-20. Search for a heavy neutrino in $\tau$ decays at Belle. https://doi.org/10.1103/physrevlett.131.211802

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