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Search for Lepton-Flavor-Violating τ Decays to a Lepton and an Invisible Boson at Belle IIopen access

Authors
Adachi, I.Adamczyk, K.Aggarwal, L.Ahmed, H.Aihara, H.Akopov, N.Aloisio, A.Ky, N. AnhAsner, D. M.Aushev, T.Aushev, V.Bae, H.Bahinipati, S.Bambade, P.Banerjee, SwBaudot, J.Bauer, M.Baur, A.Beaubien, A.Becker, J.Behera, P. K.V. Bennett, J.Bernieri, E.Bernlochner, F. U.Bertacchi, V.Bertemes, M.Bertholet, E.Bessner, M.Bettarini, S.Bhuyan, B.Bianchi, F.Bilka, T.Bilokin, S.Biswas, D.Bodrov, D.Bolz, A.Borah, J.Bozek, A.Bracko, M.Branchini, P.Browder, T. E.Budano, A.Bussino, S.Campajola, M.Cao, L.Casarosa, G.Cecchi, C.Chang, M. -C.Chang, P.Cheaib, R.Cheema, P.Chekelian, V.Chen, Y. Q.Cheon, B. G.Chilikin, K.Chirapatpimol, K.Cho, H. -E.Cho, K.Cho, S. -J.Choi, S. -K.Choudhury, S.Cinabro, D.Corona, L.Cunliffe, S.Das, S.Dattola, F.De La Cruz-Burelo, E.De La Motte, S. A.De Nardo, G.De Nuccio, M.De Pietro, G.de Sangro, R.Destefanis, M.Dey, S.De Yta-Hernandez, A.Dhamija, R.Di Canto, A.Di Capua, F.Dingfelder, J.Dolezal, Z.Jimenez, I. DominguezDong, T., VDorigo, M.Dort, K.Dossett, D.Dreyer, S.Dubey, S.Dujany, G.Ecker, P.Eliachevitch, M.Epifanov, D.Feichtinger, P.Ferber, T.Ferlewicz, D.Fillinger, T.Finck, C.Finocchiaro, G.Flood, K.Fodor, A.Forti, F.Fulsom, B. G.Gabrielli, A.Ganiev, E.Garcia-Hernandez, M.Gaur, V.Gaz, A.Gellrich, A.Ghevondyan, G.Giordano, R.Giri, A.Glazov, A.Gobbo, B.Godang, R.Goldenzweig, P.Gradl, W.Granderath, S.Graziani, E.Greenwald, D.Gruberova, Z.Gu, T.Gudkova, K.Guilliams, J.Hara, T.Hayasaka, K.Hayashii, H.Hazra, S.Hearty, C.de la Cruz, I. HerediaVillanueva, M. HernandezHershenhorn, A.Higuchi, T.Hill, E. C.Hohmann, M.Hsu, C. -L.Humair, T.Iijima, T.Inami, K.Inguglia, G.Ipsita, N.Ishikawa, A.Ito, S.Itoh, R.Iwasaki, M.Jackson, P.Jacobs, W. W.Jaffe, D. E.Jang, E. -J.Ji, Q. P.Jia, S.Jin, Y.Joo, K. K.Junkerkalefeld, H.Kakuno, H.Kaliyar, A. B.Kandra, J.Kang, K. H.Kang, S.Karl, R.Karyan, G.Kiesling, C.Kim, C. -H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kindo, H.Kinoshita, K.Kodys, P.Koga, T.Kohani, S.Kojima, K.Konno, T.Korobov, A.Korpar, S.Kovalenko, E.Kowalewski, R.Kraetzschmar, T. M. G.Krizan, P.Krokovny, P.Kuhr, T.Kumar, J.Kumar, R.Kumara, K.Kunigo, T.Kuzmin, A.Kwon, Y. -j.Lacaprara, S.Lam, T.Lanceri, L.Lange, J. S.Laurenza, M.Lautenbach, K.Leboucher, R.Le Diberder, F. R.Leitl, P.Lewis, P. M.Li, C.Li, L. K.Li, Y. B.Libby, J.Lieret, K.Liptak, Z.Liu, Q. Y.Liventsev, D.Longo, S.Lozar, A.Lueck, T.Luo, T.Lyu, C.Maggiora, M.Maiti, R.Maity, S.Manfredi, R.Manoni, E.Manthei, A.Marcello, S.Marinas, C.Martel, L.Martini, A.Martinov, T.Massaccesi, L.Masuda, M.Matsuda, T.Matsuoka, K.Matvienko, D.Maurya, S. K.McKenna, J. A.Meier, F.Merola, M.Metzner, F.Milesi, M.Miller, C.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Molina-Gonzalez, N.Moneta, S.Moser, H. -G.Mrvar, M.Mussa, R.Nakamura, I.Nakamura, K. R.Nakao, M.Nakayama, H.Nakazawa, Y.Charan, A. NarimaniNaruki, M.Natochii, A.Nayak, L.Nayak, M.Nazaryan, G.Niebuhr, C.Nisar, N. K.Nishida, S.Ogawa, S.Ono, H.Onuki, Y.Oskin, P.Pakhlov, P.Pakhlova, G.Paladino, A.Panta, A.Paoloni, E.Pardi, S.Parham, K.Park, H.Park, S. -H.Paschen, B.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Peruzzi, I.Peschke, R.Pestotnik, R.Pham, F.Piccolo, M.Piilonen, L. E.Angioni, G. PinnaPodesta-Lerma, P. L. M.Podobnik, T.Pokharel, S.Polat, L.Praz, C.Prell, S.Prencipe, E.Prim, M. T.Purwar, H.Rad, N.Rados, P.Raeuber, G.Raiz, S.Morales, A. RamirezReif, M.Reiter, S.Remnev, M.Ripp-Baudot, I.Rizzo, G.Robertson, S. H.Perez, D. RodriguezRoney, J. M.Rostomyan, A.Rout, N.Russo, G.Sanders, D. A.Sandilya, S.Sangal, A.Santelj, L.Sato, Y.Savinov, V.Scavino, B.Schueler, J.Schwanda, C.Seino, Y.Selce, A.Senyo, K.Serrano, J.Sevior, M. E.Sfienti, C.Shen, C. P.Shi, X. D.Shillington, T.Shiu, J. -G.Shwartz, B.Sibidanov, A.Simon, F.Singh, J. B.Skorupa, J.Sobie, R. J.Soffer, A.Sokolov, A.Solovieva, E.Spataro, S.Spruck, B.Staric, M.Stefkova, S.Stottler, Z. S.Stroili, R.Strube, J.Sue, Y.Sumihama, M.Sumisawa, K.Sutcliffe, W.Suzuki, S. Y.Svidras, H.Takizawa, M.Tamponi, U.Tanida, K.Tanigawa, H.Tenchini, F.Thaller, A.Tiwary, R.Tonelli, D.Torassa, E.Toutounji, N.Trabelsi, K.Uchida, M.Ueda, I.Uematsu, Y.Uglov, T.Unger, K.Unno, Y.Uno, K.Uno, S.Ushiroda, Y.Vahsen, S. E.van Tonder, R.Varner, G. S.Varvell, K. E.Vinokurova, A.Vitale, L.Vobbilisetti, V.Wakeling, H. M.Wang, E.Wang, M. -Z.Wang, X. L.Warburton, A.Watanabe, M.Watanuki, S.Welsch, M.Wessel, C.Wiechczynski, J.Xu, X. P.Yabsley, B. D.Yamada, S.Yan, W.Yang, S. B.Ye, H.Yelton, J.Yin, J. H.Yook, Y. M.Yoshihara, K.Yuan, C. Z.Yusa, Y.Zani, L.Zhang, Y.Zhilich, V.Zhou, Q. D.Zhou, X. Y.Zhukova, V. I.Zlebcik, R.Belle II Collaboration
Issue Date
May-2023
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.130, no.18
Journal Title
PHYSICAL REVIEW LETTERS
Volume
130
Number
18
URI
https://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/49502
DOI
10.1103/PhysRevLett.130.181803
ISSN
0031-9007
1079-7114
Abstract
We search for lepton-flavor-violating tau- -> e-alpha and tau- -> mu-alpha decays, where alpha is an invisible spin-0 boson. The search uses electron-positron collisions at 10.58 GeV center-of-mass energy with an integrated luminosity of 62.8 fb-1, produced by the SuperKEKB collider and collected with the Belle II detector. We search for an excess in the lepton-energy spectrum of the known tau- -> e- nu over bar e nu tau and tau- -> mu- nu over bar mu nu tau decays. We report 95% confidence-level upper limits on the branching-fraction ratio Bo tau- -> e-alpha thorn =Bo tau- -> e-nu over bar e nu tau thorn in the range o1.1-9.7 thorn x 10-3 and on Bo tau- -> mu- alpha thorn =Bo tau- -> mu- nu over bar mu nu tau thorn in the range o0.7-12.2 thorn x 10-3 for alpha masses between 0 and 1.6 GeV=c2. These results provide the most stringent bounds on invisible boson production from tau decays.
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