$Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II$

Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II

Abstract We present the results of a search for charged-lepton-flavor violating decays $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ , where ℓ − is either an electron or a muon. We combine e + e − data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb −1) with samples record...

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Main Authors:	The Belle and Belle II collaborations, I. Adachi, L. Aggarwal, H. Ahmed, Y. Ahn, H. Aihara, N. Akopov, S. Alghamdi, M. Alhakami, A. Aloisio, N. Althubiti, K. Amos, M. Angelsmark, N. Anh Ky, C. Antonioli, D. M. Asner, H. Atmacan, V. Aushev, M. Aversano, R. Ayad, V. Babu, N. K. Baghel, S. Bahinipati, P. Bambade, Sw. Banerjee, M. Barrett, M. Bartl, J. Baudot, A. Baur, A. Beaubien, F. Becherer, J. Becker, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, D. Biswas, A. Bobrov, D. Bodrov, A. Bondar, G. Bonvicini, A. Boschetti, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, S. Bussino, Q. Campagna, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, M.-C. Chang, R. Cheaib, P. Cheema, B. G. Cheon, K. Chilikin, J. Chin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, J. Cochran, I. Consigny, L. Corona, J. X. Cui, E. De La Cruz-Burelo, S. A. De La Motte, G. de Marino, G. De Nardo, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. Di Canto, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, K. Dugic, G. Dujany, P. Ecker, D. Epifanov, J. Eppelt, P. Feichtinger, T. Ferber, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, B. G. Fulsom, A. Gabrielli, A. Gale, M. Garcia-Hernandez, G. Gaudino, V. Gaur, V. Gautam, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, P. Gironella Gironell, A. Glazov, B. Gobbo, R. Godang, P. Goldenzweig, W. Gradl, E. Graziani, D. Greenwald, Z. Gruberová, Y. Guan, K. Gudkova, I. Haide, Y. Han, T. Hara, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia de la Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, R. Hoppe, P. Horak, C.-L. Hsu, T. Humair, T. Iijima, K. Inami, G. Inguglia, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, P. Jackson, D. Jacobi, W. W. Jacobs, D. E. Jaffe, E.-J. Jang, S. Jia, Y. Jin, A. Johnson, K. K. Joo, H. Junkerkalefeld, A. B. Kaliyar, J. Kandra, K. H. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Ketter, C. Kiesling, C.-H. Kim, D. Y. Kim, J.-Y. Kim, K.-H. Kim, Y. J. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, P. Križan, P. Krokovny, T. Kuhr, Y. Kulii, D. Kumar, J. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, K. Lalwani, T. Lam, L. Lanceri, J. S. Lange, T. S. Lau, M. Laurenza, K. Lautenbach, R. Leboucher, F. R. Le Diberder, M. J. Lee, C. Lemettais, P. Leo, H.-J. Li, L. K. Li, Q. M. Li, W. Z. Li, Y. Li, Y. B. Li, Y. P. Liao, J. Libby, J. Lin, S. Lin, V. Lisovskyi, M. H. Liu, Q. Y. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, C. Madaan, M. Maggiora, S. P. Maharana, R. Maiti, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, C. Martellini, A. Martens, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, D. Matvienko, S. K. Maurya, M. Maushart, J. A. McKenna, R. Mehta, F. Meier, D. Meleshko, M. Merola, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, H. Miyake, R. Mizuk, G. B. Mohanty, S. Mondal, S. Moneta, A. L. Moreira de Carvalho, H.-G. Moser, I. Nakamura, M. Nakao, Y. Nakazawa, M. Naruki, Z. Natkaniec, A. Natochii, M. Nayak, M. Neu, S. Nishida, S. Ogawa, R. Okubo, H. Ono, Y. Onuki, G. Pakhlova, S. Pardi, K. Parham, J. Park, K. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, P. L. M. Podesta-Lerma, T. Podobnik, S. Pokharel, A. Prakash, C. Praz, S. Prell, E. Prencipe, M. T. Prim, S. Privalov, H. Purwar, P. Rados, G. Raeuber, S. Raiz, V. Raj, K. Ravindran, J. U. Rehman, M. Reif, S. Reiter, M. Remnev, L. Reuter, D. Ricalde Herrmann, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, J. M. Roney, A. Rostomyan, N. Rout, D. A. Sanders, S. Sandilya, L. Santelj, V. Savinov, B. Scavino, J. Schmitz, S. Schneider, G. Schnell, C. Schwanda, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, G. Sharma, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, W. Song, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, Y. Sue, M. Sumihama, K. Sumisawa, N. Suwonjandee, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, E. Torassa, K. Trabelsi, I. Tsaklidis, I. Ueda, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, R. van Tonder, K. E. Varvell, M. Veronesi, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, A. Vossen, M. Wakai, S. Wallner, M.-Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, K. Yoshihara, C. Z. Yuan, J. Yuan, L. Zani, F. Zeng, M. Zeyrek, B. Zhang, V. Zhilich, J. S. Zhou, Q. D. Zhou, L. Zhu, R. Žlebčík
Format:	Article
Language:	English
Published:	SpringerOpen 2025-08-01
Series:	Journal of High Energy Physics
Subjects:	Beyond Standard Model Tau Physics e +-e − Experiments Flavour Physics
Online Access:	https://doi.org/10.1007/JHEP08(2025)092
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author	The Belle and Belle II collaborations I. Adachi L. Aggarwal H. Ahmed Y. Ahn H. Aihara N. Akopov S. Alghamdi M. Alhakami A. Aloisio N. Althubiti K. Amos M. Angelsmark N. Anh Ky C. Antonioli D. M. Asner H. Atmacan V. Aushev M. Aversano R. Ayad V. Babu N. K. Baghel S. Bahinipati P. Bambade Sw. Banerjee M. Barrett M. Bartl J. Baudot A. Baur A. Beaubien F. Becherer J. Becker J. V. Bennett F. U. Bernlochner V. Bertacchi M. Bertemes E. Bertholet M. Bessner S. Bettarini B. Bhuyan F. Bianchi D. Biswas A. Bobrov D. Bodrov A. Bondar G. Bonvicini A. Boschetti A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano S. Bussino Q. Campagna M. Campajola L. Cao G. Casarosa C. Cecchi M.-C. Chang R. Cheaib P. Cheema B. G. Cheon K. Chilikin J. Chin K. Chirapatpimol H.-E. Cho K. Cho S.-J. Cho S.-K. Choi S. Choudhury J. Cochran I. Consigny L. Corona J. X. Cui E. De La Cruz-Burelo S. A. De La Motte G. de Marino G. De Nardo G. De Pietro R. de Sangro M. Destefanis S. Dey A. Di Canto J. Dingfelder Z. Doležal I. Domínguez Jiménez T. V. Dong M. Dorigo K. Dugic G. Dujany P. Ecker D. Epifanov J. Eppelt P. Feichtinger T. Ferber T. Fillinger C. Finck G. Finocchiaro A. Fodor F. Forti B. G. Fulsom A. Gabrielli A. Gale M. Garcia-Hernandez G. Gaudino V. Gaur V. Gautam A. Gaz A. Gellrich G. Ghevondyan D. Ghosh H. Ghumaryan G. Giakoustidis R. Giordano A. Giri P. Gironella Gironell A. Glazov B. Gobbo R. Godang P. Goldenzweig W. Gradl E. Graziani D. Greenwald Z. Gruberová Y. Guan K. Gudkova I. Haide Y. Han T. Hara K. Hayasaka H. Hayashii S. Hazra C. Hearty M. T. Hedges A. Heidelbach I. Heredia de la Cruz M. Hernández Villanueva T. Higuchi M. Hoek M. Hohmann R. Hoppe P. Horak C.-L. Hsu T. Humair T. Iijima K. Inami G. Inguglia N. Ipsita A. Ishikawa R. Itoh M. Iwasaki P. Jackson D. Jacobi W. W. Jacobs D. E. Jaffe E.-J. Jang S. Jia Y. Jin A. Johnson K. K. Joo H. Junkerkalefeld A. B. Kaliyar J. Kandra K. H. Kang G. Karyan T. Kawasaki F. Keil C. Ketter C. Kiesling C.-H. Kim D. Y. Kim J.-Y. Kim K.-H. Kim Y. J. Kim H. Kindo K. Kinoshita P. Kodyš T. Koga S. Kohani K. Kojima A. Korobov S. Korpar E. Kovalenko R. Kowalewski P. Križan P. Krokovny T. Kuhr Y. Kulii D. Kumar J. Kumar R. Kumar K. Kumara T. Kunigo A. Kuzmin Y.-J. Kwon S. Lacaprara K. Lalwani T. Lam L. Lanceri J. S. Lange T. S. Lau M. Laurenza K. Lautenbach R. Leboucher F. R. Le Diberder M. J. Lee C. Lemettais P. Leo H.-J. Li L. K. Li Q. M. Li W. Z. Li Y. Li Y. B. Li Y. P. Liao J. Libby J. Lin S. Lin V. Lisovskyi M. H. Liu Q. Y. Liu Y. Liu Z. Q. Liu D. Liventsev S. Longo T. Lueck C. Lyu Y. Ma C. Madaan M. Maggiora S. P. Maharana R. Maiti G. Mancinelli R. Manfredi E. Manoni M. Mantovano D. Marcantonio S. Marcello C. Marinas C. Martellini A. Martens A. Martini T. Martinov L. Massaccesi M. Masuda D. Matvienko S. K. Maurya M. Maushart J. A. McKenna R. Mehta F. Meier D. Meleshko M. Merola C. Miller M. Mirra S. Mitra K. Miyabayashi H. Miyake R. Mizuk G. B. Mohanty S. Mondal S. Moneta A. L. Moreira de Carvalho H.-G. Moser I. Nakamura M. Nakao Y. Nakazawa M. Naruki Z. Natkaniec A. Natochii M. Nayak M. Neu S. Nishida S. Ogawa R. Okubo H. Ono Y. Onuki G. Pakhlova S. Pardi K. Parham J. Park K. Park S.-H. Park B. Paschen A. Passeri S. Patra S. Paul T. K. Pedlar I. Peruzzi R. Peschke R. Pestotnik M. Piccolo L. E. Piilonen P. L. M. Podesta-Lerma T. Podobnik S. Pokharel A. Prakash C. Praz S. Prell E. Prencipe M. T. Prim S. Privalov H. Purwar P. Rados G. Raeuber S. Raiz V. Raj K. Ravindran J. U. Rehman M. Reif S. Reiter M. Remnev L. Reuter D. Ricalde Herrmann I. Ripp-Baudot G. Rizzo S. H. Robertson J. M. Roney A. Rostomyan N. Rout D. A. Sanders S. Sandilya L. Santelj V. Savinov B. Scavino J. Schmitz S. Schneider G. Schnell C. Schwanda Y. Seino A. Selce K. Senyo J. Serrano M. E. Sevior C. Sfienti W. Shan G. Sharma C. P. Shen X. D. Shi T. Shillington T. Shimasaki J.-G. Shiu D. Shtol A. Sibidanov F. Simon J. B. Singh J. Skorupa R. J. Sobie M. Sobotzik A. Soffer A. Sokolov E. Solovieva W. Song S. Spataro B. Spruck M. Starič P. Stavroulakis S. Stefkova R. Stroili Y. Sue M. Sumihama K. Sumisawa N. Suwonjandee H. Svidras M. Takahashi M. Takizawa U. Tamponi K. Tanida F. Tenchini A. Thaller O. Tittel R. Tiwary E. Torassa K. Trabelsi I. Tsaklidis I. Ueda T. Uglov K. Unger Y. Unno K. Uno S. Uno P. Urquijo Y. Ushiroda S. E. Vahsen R. van Tonder K. E. Varvell M. Veronesi A. Vinokurova V. S. Vismaya L. Vitale V. Vobbilisetti R. Volpe A. Vossen M. Wakai S. Wallner M.-Z. Wang A. Warburton M. Watanabe S. Watanuki C. Wessel E. Won X. P. Xu B. D. Yabsley S. Yamada W. Yan S. B. Yang J. Yelton J. H. Yin K. Yoshihara C. Z. Yuan J. Yuan L. Zani F. Zeng M. Zeyrek B. Zhang V. Zhilich J. S. Zhou Q. D. Zhou L. Zhu R. Žlebčík
author_facet	The Belle and Belle II collaborations I. Adachi L. Aggarwal H. Ahmed Y. Ahn H. Aihara N. Akopov S. Alghamdi M. Alhakami A. Aloisio N. Althubiti K. Amos M. Angelsmark N. Anh Ky C. Antonioli D. M. Asner H. Atmacan V. Aushev M. Aversano R. Ayad V. Babu N. K. Baghel S. Bahinipati P. Bambade Sw. Banerjee M. Barrett M. Bartl J. Baudot A. Baur A. Beaubien F. Becherer J. Becker J. V. Bennett F. U. Bernlochner V. Bertacchi M. Bertemes E. Bertholet M. Bessner S. Bettarini B. Bhuyan F. Bianchi D. Biswas A. Bobrov D. Bodrov A. Bondar G. Bonvicini A. Boschetti A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano S. Bussino Q. Campagna M. Campajola L. Cao G. Casarosa C. Cecchi M.-C. Chang R. Cheaib P. Cheema B. G. Cheon K. Chilikin J. Chin K. Chirapatpimol H.-E. Cho K. Cho S.-J. Cho S.-K. Choi S. Choudhury J. Cochran I. Consigny L. Corona J. X. Cui E. De La Cruz-Burelo S. A. De La Motte G. de Marino G. De Nardo G. De Pietro R. de Sangro M. Destefanis S. Dey A. Di Canto J. Dingfelder Z. Doležal I. Domínguez Jiménez T. V. Dong M. Dorigo K. Dugic G. Dujany P. Ecker D. Epifanov J. Eppelt P. Feichtinger T. Ferber T. Fillinger C. Finck G. Finocchiaro A. Fodor F. Forti B. G. Fulsom A. Gabrielli A. Gale M. Garcia-Hernandez G. Gaudino V. Gaur V. Gautam A. Gaz A. Gellrich G. Ghevondyan D. Ghosh H. Ghumaryan G. Giakoustidis R. Giordano A. Giri P. Gironella Gironell A. Glazov B. Gobbo R. Godang P. Goldenzweig W. Gradl E. Graziani D. Greenwald Z. Gruberová Y. Guan K. Gudkova I. Haide Y. Han T. Hara K. Hayasaka H. Hayashii S. Hazra C. Hearty M. T. Hedges A. Heidelbach I. Heredia de la Cruz M. Hernández Villanueva T. Higuchi M. Hoek M. Hohmann R. Hoppe P. Horak C.-L. Hsu T. Humair T. Iijima K. Inami G. Inguglia N. Ipsita A. Ishikawa R. Itoh M. Iwasaki P. Jackson D. Jacobi W. W. Jacobs D. E. Jaffe E.-J. Jang S. Jia Y. Jin A. Johnson K. K. Joo H. Junkerkalefeld A. B. Kaliyar J. Kandra K. H. Kang G. Karyan T. Kawasaki F. Keil C. Ketter C. Kiesling C.-H. Kim D. Y. Kim J.-Y. Kim K.-H. Kim Y. J. Kim H. Kindo K. Kinoshita P. Kodyš T. Koga S. Kohani K. Kojima A. Korobov S. Korpar E. Kovalenko R. Kowalewski P. Križan P. Krokovny T. Kuhr Y. Kulii D. Kumar J. Kumar R. Kumar K. Kumara T. Kunigo A. Kuzmin Y.-J. Kwon S. Lacaprara K. Lalwani T. Lam L. Lanceri J. S. Lange T. S. Lau M. Laurenza K. Lautenbach R. Leboucher F. R. Le Diberder M. J. Lee C. Lemettais P. Leo H.-J. Li L. K. Li Q. M. Li W. Z. Li Y. Li Y. B. Li Y. P. Liao J. Libby J. Lin S. Lin V. Lisovskyi M. H. Liu Q. Y. Liu Y. Liu Z. Q. Liu D. Liventsev S. Longo T. Lueck C. Lyu Y. Ma C. Madaan M. Maggiora S. P. Maharana R. Maiti G. Mancinelli R. Manfredi E. Manoni M. Mantovano D. Marcantonio S. Marcello C. Marinas C. Martellini A. Martens A. Martini T. Martinov L. Massaccesi M. Masuda D. Matvienko S. K. Maurya M. Maushart J. A. McKenna R. Mehta F. Meier D. Meleshko M. Merola C. Miller M. Mirra S. Mitra K. Miyabayashi H. Miyake R. Mizuk G. B. Mohanty S. Mondal S. Moneta A. L. Moreira de Carvalho H.-G. Moser I. Nakamura M. Nakao Y. Nakazawa M. Naruki Z. Natkaniec A. Natochii M. Nayak M. Neu S. Nishida S. Ogawa R. Okubo H. Ono Y. Onuki G. Pakhlova S. Pardi K. Parham J. Park K. Park S.-H. Park B. Paschen A. Passeri S. Patra S. Paul T. K. Pedlar I. Peruzzi R. Peschke R. Pestotnik M. Piccolo L. E. Piilonen P. L. M. Podesta-Lerma T. Podobnik S. Pokharel A. Prakash C. Praz S. Prell E. Prencipe M. T. Prim S. Privalov H. Purwar P. Rados G. Raeuber S. Raiz V. Raj K. Ravindran J. U. Rehman M. Reif S. Reiter M. Remnev L. Reuter D. Ricalde Herrmann I. Ripp-Baudot G. Rizzo S. H. Robertson J. M. Roney A. Rostomyan N. Rout D. A. Sanders S. Sandilya L. Santelj V. Savinov B. Scavino J. Schmitz S. Schneider G. Schnell C. Schwanda Y. Seino A. Selce K. Senyo J. Serrano M. E. Sevior C. Sfienti W. Shan G. Sharma C. P. Shen X. D. Shi T. Shillington T. Shimasaki J.-G. Shiu D. Shtol A. Sibidanov F. Simon J. B. Singh J. Skorupa R. J. Sobie M. Sobotzik A. Soffer A. Sokolov E. Solovieva W. Song S. Spataro B. Spruck M. Starič P. Stavroulakis S. Stefkova R. Stroili Y. Sue M. Sumihama K. Sumisawa N. Suwonjandee H. Svidras M. Takahashi M. Takizawa U. Tamponi K. Tanida F. Tenchini A. Thaller O. Tittel R. Tiwary E. Torassa K. Trabelsi I. Tsaklidis I. Ueda T. Uglov K. Unger Y. Unno K. Uno S. Uno P. Urquijo Y. Ushiroda S. E. Vahsen R. van Tonder K. E. Varvell M. Veronesi A. Vinokurova V. S. Vismaya L. Vitale V. Vobbilisetti R. Volpe A. Vossen M. Wakai S. Wallner M.-Z. Wang A. Warburton M. Watanabe S. Watanuki C. Wessel E. Won X. P. Xu B. D. Yabsley S. Yamada W. Yan S. B. Yang J. Yelton J. H. Yin K. Yoshihara C. Z. Yuan J. Yuan L. Zani F. Zeng M. Zeyrek B. Zhang V. Zhilich J. S. Zhou Q. D. Zhou L. Zhu R. Žlebčík
author_sort	The Belle and Belle II collaborations
collection	DOAJ
description	Abstract We present the results of a search for charged-lepton-flavor violating decays $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ , where ℓ − is either an electron or a muon. We combine e + e − data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb −1) with samples recorded by the Belle experiment at the KEKB collider (980 fb −1) to obtain a sample of 1.3 billion e + e − → τ + τ − events. We observe 0 and 1 events and set 90% confidence level upper limits of 0.8 × 10 −8 and 1.2 × 10 −8 on the branching fractions of the decay modes $${\tau }^{-}\to {e}^{-}{K}_{S}^{0}$$ and $${\tau }^{-}\to {\mu }^{-}{K}_{S}^{0}$$ , respectively. These are the most stringent upper limits to date.
format	Article
id	doaj-art-25d935c713ff423e94abb76aa4e1833c
institution	Kabale University
issn	1029-8479
language	English
publishDate	2025-08-01
publisher	SpringerOpen
record_format	Article
series	Journal of High Energy Physics
spelling	doaj-art-25d935c713ff423e94abb76aa4e1833c2025-08-20T03:45:40ZengSpringerOpenJournal of High Energy Physics1029-84792025-08-012025812710.1007/JHEP08(2025)092Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle IIThe Belle and Belle II collaborationsI. AdachiL. AggarwalH. AhmedY. AhnH. AiharaN. AkopovS. AlghamdiM. AlhakamiA. AloisioN. AlthubitiK. AmosM. AngelsmarkN. Anh KyC. AntonioliD. M. AsnerH. AtmacanV. AushevM. AversanoR. AyadV. BabuN. K. BaghelS. BahinipatiP. BambadeSw. BanerjeeM. BarrettM. BartlJ. BaudotA. BaurA. BeaubienF. BechererJ. BeckerJ. V. BennettF. U. BernlochnerV. BertacchiM. BertemesE. BertholetM. BessnerS. BettariniB. BhuyanF. BianchiD. BiswasA. BobrovD. BodrovA. BondarG. BonviciniA. BoschettiA. BozekM. BračkoP. BranchiniT. E. BrowderA. BudanoS. BussinoQ. CampagnaM. CampajolaL. CaoG. CasarosaC. CecchiM.-C. ChangR. CheaibP. CheemaB. G. CheonK. ChilikinJ. ChinK. ChirapatpimolH.-E. ChoK. ChoS.-J. ChoS.-K. ChoiS. ChoudhuryJ. CochranI. ConsignyL. CoronaJ. X. CuiE. De La Cruz-BureloS. A. De La MotteG. de MarinoG. De NardoG. De PietroR. de SangroM. DestefanisS. DeyA. Di CantoJ. DingfelderZ. DoležalI. Domínguez JiménezT. V. DongM. DorigoK. DugicG. DujanyP. EckerD. EpifanovJ. EppeltP. FeichtingerT. FerberT. FillingerC. FinckG. FinocchiaroA. FodorF. FortiB. G. FulsomA. GabrielliA. GaleM. Garcia-HernandezG. GaudinoV. GaurV. GautamA. GazA. GellrichG. GhevondyanD. GhoshH. GhumaryanG. GiakoustidisR. GiordanoA. GiriP. Gironella GironellA. GlazovB. GobboR. GodangP. GoldenzweigW. GradlE. GrazianiD. GreenwaldZ. GruberováY. GuanK. GudkovaI. HaideY. HanT. HaraK. HayasakaH. HayashiiS. HazraC. HeartyM. T. HedgesA. HeidelbachI. Heredia de la CruzM. Hernández VillanuevaT. HiguchiM. HoekM. HohmannR. HoppeP. HorakC.-L. HsuT. HumairT. IijimaK. InamiG. IngugliaN. IpsitaA. IshikawaR. ItohM. IwasakiP. JacksonD. JacobiW. W. JacobsD. E. JaffeE.-J. JangS. JiaY. JinA. JohnsonK. K. JooH. JunkerkalefeldA. B. KaliyarJ. KandraK. H. KangG. KaryanT. KawasakiF. KeilC. KetterC. KieslingC.-H. KimD. Y. KimJ.-Y. KimK.-H. KimY. J. KimH. KindoK. KinoshitaP. KodyšT. KogaS. KohaniK. KojimaA. KorobovS. KorparE. KovalenkoR. KowalewskiP. KrižanP. KrokovnyT. KuhrY. KuliiD. KumarJ. KumarR. KumarK. KumaraT. KunigoA. KuzminY.-J. KwonS. LacapraraK. LalwaniT. LamL. LanceriJ. S. LangeT. S. LauM. LaurenzaK. LautenbachR. LeboucherF. R. Le DiberderM. J. LeeC. LemettaisP. LeoH.-J. LiL. K. LiQ. M. LiW. Z. LiY. LiY. B. LiY. P. LiaoJ. LibbyJ. LinS. LinV. LisovskyiM. H. LiuQ. Y. LiuY. LiuZ. Q. LiuD. LiventsevS. LongoT. LueckC. LyuY. MaC. MadaanM. MaggioraS. P. MaharanaR. MaitiG. MancinelliR. ManfrediE. ManoniM. MantovanoD. MarcantonioS. MarcelloC. MarinasC. MartelliniA. MartensA. MartiniT. MartinovL. MassaccesiM. MasudaD. MatvienkoS. K. MauryaM. MaushartJ. A. McKennaR. MehtaF. MeierD. MeleshkoM. MerolaC. MillerM. MirraS. MitraK. MiyabayashiH. MiyakeR. MizukG. B. MohantyS. MondalS. MonetaA. L. Moreira de CarvalhoH.-G. MoserI. NakamuraM. NakaoY. NakazawaM. NarukiZ. NatkaniecA. NatochiiM. NayakM. NeuS. NishidaS. OgawaR. OkuboH. OnoY. OnukiG. PakhlovaS. PardiK. ParhamJ. ParkK. ParkS.-H. ParkB. PaschenA. PasseriS. PatraS. PaulT. K. PedlarI. PeruzziR. PeschkeR. PestotnikM. PiccoloL. E. PiilonenP. L. M. Podesta-LermaT. PodobnikS. PokharelA. PrakashC. PrazS. PrellE. PrencipeM. T. PrimS. PrivalovH. PurwarP. RadosG. RaeuberS. RaizV. RajK. RavindranJ. U. RehmanM. ReifS. ReiterM. RemnevL. ReuterD. Ricalde HerrmannI. Ripp-BaudotG. RizzoS. H. RobertsonJ. M. RoneyA. RostomyanN. RoutD. A. SandersS. SandilyaL. SanteljV. SavinovB. ScavinoJ. SchmitzS. SchneiderG. SchnellC. SchwandaY. SeinoA. SelceK. SenyoJ. SerranoM. E. SeviorC. SfientiW. ShanG. SharmaC. P. ShenX. D. ShiT. ShillingtonT. ShimasakiJ.-G. ShiuD. ShtolA. SibidanovF. SimonJ. B. SinghJ. SkorupaR. J. SobieM. SobotzikA. SofferA. SokolovE. SolovievaW. SongS. SpataroB. SpruckM. StaričP. StavroulakisS. StefkovaR. StroiliY. SueM. SumihamaK. SumisawaN. SuwonjandeeH. SvidrasM. TakahashiM. TakizawaU. TamponiK. TanidaF. TenchiniA. ThallerO. TittelR. TiwaryE. TorassaK. TrabelsiI. TsaklidisI. UedaT. UglovK. UngerY. UnnoK. UnoS. UnoP. UrquijoY. UshirodaS. E. VahsenR. van TonderK. E. VarvellM. VeronesiA. VinokurovaV. S. VismayaL. VitaleV. VobbilisettiR. VolpeA. VossenM. WakaiS. WallnerM.-Z. WangA. WarburtonM. WatanabeS. WatanukiC. WesselE. WonX. P. XuB. D. YabsleyS. YamadaW. YanS. B. YangJ. YeltonJ. H. YinK. YoshiharaC. Z. YuanJ. YuanL. ZaniF. ZengM. ZeyrekB. ZhangV. ZhilichJ. S. ZhouQ. D. ZhouL. ZhuR. ŽlebčíkAbstract We present the results of a search for charged-lepton-flavor violating decays $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ , where ℓ − is either an electron or a muon. We combine e + e − data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb −1) with samples recorded by the Belle experiment at the KEKB collider (980 fb −1) to obtain a sample of 1.3 billion e + e − → τ + τ − events. We observe 0 and 1 events and set 90% confidence level upper limits of 0.8 × 10 −8 and 1.2 × 10 −8 on the branching fractions of the decay modes $${\tau }^{-}\to {e}^{-}{K}_{S}^{0}$$ and $${\tau }^{-}\to {\mu }^{-}{K}_{S}^{0}$$ , respectively. These are the most stringent upper limits to date.https://doi.org/10.1007/JHEP08(2025)092Beyond Standard ModelTau Physicse +-e − ExperimentsFlavour Physics
spellingShingle	The Belle and Belle II collaborations I. Adachi L. Aggarwal H. Ahmed Y. Ahn H. Aihara N. Akopov S. Alghamdi M. Alhakami A. Aloisio N. Althubiti K. Amos M. Angelsmark N. Anh Ky C. Antonioli D. M. Asner H. Atmacan V. Aushev M. Aversano R. Ayad V. Babu N. K. Baghel S. Bahinipati P. Bambade Sw. Banerjee M. Barrett M. Bartl J. Baudot A. Baur A. Beaubien F. Becherer J. Becker J. V. Bennett F. U. Bernlochner V. Bertacchi M. Bertemes E. Bertholet M. Bessner S. Bettarini B. Bhuyan F. Bianchi D. Biswas A. Bobrov D. Bodrov A. Bondar G. Bonvicini A. Boschetti A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano S. Bussino Q. Campagna M. Campajola L. Cao G. Casarosa C. Cecchi M.-C. Chang R. Cheaib P. Cheema B. G. Cheon K. Chilikin J. Chin K. Chirapatpimol H.-E. Cho K. Cho S.-J. Cho S.-K. Choi S. Choudhury J. Cochran I. Consigny L. Corona J. X. Cui E. De La Cruz-Burelo S. A. De La Motte G. de Marino G. De Nardo G. De Pietro R. de Sangro M. Destefanis S. Dey A. Di Canto J. Dingfelder Z. Doležal I. Domínguez Jiménez T. V. Dong M. Dorigo K. Dugic G. Dujany P. Ecker D. Epifanov J. Eppelt P. Feichtinger T. Ferber T. Fillinger C. Finck G. Finocchiaro A. Fodor F. Forti B. G. Fulsom A. Gabrielli A. Gale M. Garcia-Hernandez G. Gaudino V. Gaur V. Gautam A. Gaz A. Gellrich G. Ghevondyan D. Ghosh H. Ghumaryan G. Giakoustidis R. Giordano A. Giri P. Gironella Gironell A. Glazov B. Gobbo R. Godang P. Goldenzweig W. Gradl E. Graziani D. Greenwald Z. Gruberová Y. Guan K. Gudkova I. Haide Y. Han T. Hara K. Hayasaka H. Hayashii S. Hazra C. Hearty M. T. Hedges A. Heidelbach I. Heredia de la Cruz M. Hernández Villanueva T. Higuchi M. Hoek M. Hohmann R. Hoppe P. Horak C.-L. Hsu T. Humair T. Iijima K. Inami G. Inguglia N. Ipsita A. Ishikawa R. Itoh M. Iwasaki P. Jackson D. Jacobi W. W. Jacobs D. E. Jaffe E.-J. Jang S. Jia Y. Jin A. Johnson K. K. Joo H. Junkerkalefeld A. B. Kaliyar J. Kandra K. H. Kang G. Karyan T. Kawasaki F. Keil C. Ketter C. Kiesling C.-H. Kim D. Y. Kim J.-Y. Kim K.-H. Kim Y. J. Kim H. Kindo K. Kinoshita P. Kodyš T. Koga S. Kohani K. Kojima A. Korobov S. Korpar E. Kovalenko R. Kowalewski P. Križan P. Krokovny T. Kuhr Y. Kulii D. Kumar J. Kumar R. Kumar K. Kumara T. Kunigo A. Kuzmin Y.-J. Kwon S. Lacaprara K. Lalwani T. Lam L. Lanceri J. S. Lange T. S. Lau M. Laurenza K. Lautenbach R. Leboucher F. R. Le Diberder M. J. Lee C. Lemettais P. Leo H.-J. Li L. K. Li Q. M. Li W. Z. Li Y. Li Y. B. Li Y. P. Liao J. Libby J. Lin S. Lin V. Lisovskyi M. H. Liu Q. Y. Liu Y. Liu Z. Q. Liu D. Liventsev S. Longo T. Lueck C. Lyu Y. Ma C. Madaan M. Maggiora S. P. Maharana R. Maiti G. Mancinelli R. Manfredi E. Manoni M. Mantovano D. Marcantonio S. Marcello C. Marinas C. Martellini A. Martens A. Martini T. Martinov L. Massaccesi M. Masuda D. Matvienko S. K. Maurya M. Maushart J. A. McKenna R. Mehta F. Meier D. Meleshko M. Merola C. Miller M. Mirra S. Mitra K. Miyabayashi H. Miyake R. Mizuk G. B. Mohanty S. Mondal S. Moneta A. L. Moreira de Carvalho H.-G. Moser I. Nakamura M. Nakao Y. Nakazawa M. Naruki Z. Natkaniec A. Natochii M. Nayak M. Neu S. Nishida S. Ogawa R. Okubo H. Ono Y. Onuki G. Pakhlova S. Pardi K. Parham J. Park K. Park S.-H. Park B. Paschen A. Passeri S. Patra S. Paul T. K. Pedlar I. Peruzzi R. Peschke R. Pestotnik M. Piccolo L. E. Piilonen P. L. M. Podesta-Lerma T. Podobnik S. Pokharel A. Prakash C. Praz S. Prell E. Prencipe M. T. Prim S. Privalov H. Purwar P. Rados G. Raeuber S. Raiz V. Raj K. Ravindran J. U. Rehman M. Reif S. Reiter M. Remnev L. Reuter D. Ricalde Herrmann I. Ripp-Baudot G. Rizzo S. H. Robertson J. M. Roney A. Rostomyan N. Rout D. A. Sanders S. Sandilya L. Santelj V. Savinov B. Scavino J. Schmitz S. Schneider G. Schnell C. Schwanda Y. Seino A. Selce K. Senyo J. Serrano M. E. Sevior C. Sfienti W. Shan G. Sharma C. P. Shen X. D. Shi T. Shillington T. Shimasaki J.-G. Shiu D. Shtol A. Sibidanov F. Simon J. B. Singh J. Skorupa R. J. Sobie M. Sobotzik A. Soffer A. Sokolov E. Solovieva W. Song S. Spataro B. Spruck M. Starič P. Stavroulakis S. Stefkova R. Stroili Y. Sue M. Sumihama K. Sumisawa N. Suwonjandee H. Svidras M. Takahashi M. Takizawa U. Tamponi K. Tanida F. Tenchini A. Thaller O. Tittel R. Tiwary E. Torassa K. Trabelsi I. Tsaklidis I. Ueda T. Uglov K. Unger Y. Unno K. Uno S. Uno P. Urquijo Y. Ushiroda S. E. Vahsen R. van Tonder K. E. Varvell M. Veronesi A. Vinokurova V. S. Vismaya L. Vitale V. Vobbilisetti R. Volpe A. Vossen M. Wakai S. Wallner M.-Z. Wang A. Warburton M. Watanabe S. Watanuki C. Wessel E. Won X. P. Xu B. D. Yabsley S. Yamada W. Yan S. B. Yang J. Yelton J. H. Yin K. Yoshihara C. Z. Yuan J. Yuan L. Zani F. Zeng M. Zeyrek B. Zhang V. Zhilich J. S. Zhou Q. D. Zhou L. Zhu R. Žlebčík Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II Journal of High Energy Physics Beyond Standard Model Tau Physics e +-e − Experiments Flavour Physics
title	Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II
title_full	Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II
title_fullStr	Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II
title_full_unstemmed	Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II
title_short	Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II
title_sort	search for lepton flavor violating tau to ell k s 0 decays at belle and belle ii
topic	Beyond Standard Model Tau Physics e +-e − Experiments Flavour Physics
url	https://doi.org/10.1007/JHEP08(2025)092
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searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT kevarvell searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT mveronesi searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT avinokurova searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT vsvismaya searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT lvitale searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT vvobbilisetti searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT rvolpe searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT avossen searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT mwakai searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT swallner searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT mzwang searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT awarburton searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT mwatanabe searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT swatanuki searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT cwessel searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT ewon searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT xpxu searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT bdyabsley searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT syamada searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT wyan searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT sbyang searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT jyelton searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT jhyin searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT kyoshihara searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT czyuan searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT jyuan searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT lzani searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT fzeng searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT mzeyrek searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT bzhang searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT vzhilich searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT jszhou searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT qdzhou searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT lzhu searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii AT rzlebcik searchforleptonflavorviolatingtautoellks0decaysatbelleandbelleii

Search for lepton-flavor-violating $${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$$ decays at Belle and Belle II

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