首页|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

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英文摘要

We present the results of a search for charged-lepton-flavor violating decays $\tau^{-} \rightarrow \ell^{-}K_{S}^{0}$, where $\ell^{-}$ 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 $e^+e^-\to\tau^+\tau^-$ events. We observe 0 and 1 events and set $90\%$ confidence level upper limits of $0.8 \times 10^{-8}$ and $1.2 \times 10^{-8}$ on the branching fractions of the decay modes $\tau^{-} \rightarrow e^{-}K_{S}^{0}$ and $\tau^{-} \rightarrow \mu^{-}K_{S}^{0}$, respectively. These are the most stringent upper limits to date.

作者：J. Eppelt、P. Feichtinger、T. Ferber、C. Finck、G. Finocchiaro、A. Fodor、D. Epifanov、T. Fillinger、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、D. Bodrov、A. Bondar、G. Bonvicini、A. Boschetti、A. Bozek、M. Bra?ko、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、F. Forti、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、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、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、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、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、Z. Dole?al、I. Domínguez Jiménez、T. V. Dong、M. Dorigo、K. Dugic、G. Dujany、P. Ecker、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. Stari?、P. Stavroulakis、S. Stefkova、R. Stroili、Y. Sue、M. Sumihama、K. Sumisawa、N. Suwonjandee、B. G. Fulsom、A. Gabrielli、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、Belle、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、S. Sandilya、L. Santelj、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、M. Nakao、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. ?leb?ík、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、H. Junkerkalefeld、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、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. Kody?、T. Koga、S. Kohani、K. Kojima、A. Korobov、S. Korpar、E. Kovalenko、R. Kowalewski、P. Kri?an、P. Krokovny、T. Kuhr、Y. Kulii、D. Kumar、J. Kumar、T. Iijima、K. Inami

作者单位：

学科分类：物理学

推荐引用：J. Eppelt,P. Feichtinger,T. Ferber,C. Finck,G. Finocchiaro,A. Fodor,D. Epifanov,T. Fillinger,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,D. Bodrov,A. Bondar,G. Bonvicini,A. Boschetti,A. Bozek,M. Bra?ko,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,F. Forti,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,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,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,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,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,Z. Dole?al,I. Domínguez Jiménez,T. V. Dong,M. Dorigo,K. Dugic,G. Dujany,P. Ecker,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. Stari?,P. Stavroulakis,S. Stefkova,R. Stroili,Y. Sue,M. Sumihama,K. Sumisawa,N. Suwonjandee,B. G. Fulsom,A. Gabrielli,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,Belle,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,S. Sandilya,L. Santelj,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,M. Nakao,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. ?leb?ík,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,H. Junkerkalefeld,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,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. Kody?,T. Koga,S. Kohani,K. Kojima,A. Korobov,S. Korpar,E. Kovalenko,R. Kowalewski,P. Kri?an,P. Krokovny,T. Kuhr,Y. Kulii,D. Kumar,J. Kumar,T. Iijima,K. Inami.Search for lepton-flavor-violating $\tau^- \to \ell^- K_s^0$ decays at Belle and Belle II[EB/OL].(2025-04-22)[2025-05-24].https://arxiv.org/abs/2504.15745.点此复制

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

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