Search for Lepton-Flavor-Violating Decays to a Lepton and an Invisible Boson at Belle II
I. Adachi,K. Adamczyk,L. Aggarwal,H. Ahmed,H. Aihara,N. Akopov,A. Aloisio,N. Anh Ky,D. M. Asner,T. Aushev,V. Aushev,H. Bae,S. Bahinipati,P. Bambade,Sw Banerjee,J. Baudot,M. Bauer,A. Baur,A. Beaubien,J. Becker,P. K. Behera,J. V. Bennett,E. Bernieri,F. U. Bernlochner,V. Bertacchi,M. Bertemes,E. Bertholet,M. Bessner,S. Bettarini,B. Bhuyan,F. Bianchi,T. Bilka,S. Bilokin,D. Biswas,D. Bodrov,A. Bolz,J. Borah,A. Bozek,M. Bracko,P. Branchini,T. E. Browder,A. Budano,S. Bussino,M. Campajola,L. Cao,G. Casarosa,C. Cecchi,M. -C. Chang,P. Chang,R. Cheaib,P. Cheema,V. Chekelian,Y. Q. Chen,B. G. Cheon,K. Chilikin,K. Chirapatpimol,H. -E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,S. Choudhury,D. Cinabro,L. Corona,S. Cunliffe,S. Das,F. Dattola,E. De La Cruz-Burelo,S. A. De La Motte,G. De Nardo,M. De Nuccio,G. De Pietro,R. de Sangro,M. Destefanis,S. Dey,A. De Yta-Hernandez,R. Dhamija,A. Di Canto,F. Di Capua,J. Dingfelder,Z. Dolezal,I. Dominguez Jimenez,T. Dong,M. Dorigo,K. Dort,D. Dossett,S. Dreyer,S. Dubey,G. Dujany,P. Ecker,M. Eliachevitch,D. Epifanov,P. Feichtinger,T. Ferber,D. Ferlewicz,T. Fillinger,C. Finck,G. Finocchiaro,K. Flood,A. Fodor,F. Forti,B. G. Fulsom,A. Gabrielli,E. Ganiev,M. Garcia-Hernandez,V. Gaur,A. Gaz,A. Gellrich,G. Ghevondyan,R. Giordano,A. Giri,A. Glazov,B. Gobbo,R. Godang,P. Goldenzweig,W. Gradl,S. Granderath,E. Graziani,D. Greenwald,Z. Gruberova,T. Gu,K. Gudkova,J. Guilliams,T. Hara,K. Hayasaka,H. Hayashii,S. Hazra,C. Hearty,I. Heredia de la Cruz,M. Hernandez Villanueva,A. Hershenhorn,T. Higuchi,E. C. Hill,M. Hohmann,C. -L. Hsu,T. Humair,T. Iijima,K. Inami,G. Inguglia,N. Ipsita,A. Ishikawa,S. Ito,R. Itoh,M. Iwasaki,P. Jackson,W. W. Jacobs,D. E. Jaffe,E. -J. Jang,Q. P. Ji,S. Jia,Y. Jin,K. K. Joo,H. Junkerkalefeld,H. Kakuno,A. B. Kaliyar,J. Kandra,K. H. Kang,S. Kang,R. Karl,G. Karyan,C. Kiesling,C. -H. Kim,D. Y. Kim,K. -H. Kim,Y. -K. Kim,H. Kindo,K. Kinoshita,P. Kodys,T. Koga,S. Kohani,K. Kojima,T. Konno,A. Korobov,S. Korpar,E. Kovalenko,R. Kowalewski,T. M. G. Kraetzschmar,P. Krizan,P. Krokovny,T. Kuhr,J. Kumar,R. Kumar,K. Kumara,T. Kunigo,A. Kuzmin,Y. -j. Kwon,S. Lacaprara,T. Lam,L. Lanceri,J. S. Lange,M. Laurenza,K. Lautenbach,R. Leboucher,F. R. Le Diberder,P. Leitl,P. M. Lewis,C. Li,L. K. Li,Y. B. Li,J. Libby,K. Lieret,Z. Liptak,Q. Y. Liu,D. Liventsev,S. Longo,A. Lozar,T. Lueck,T. Luo,C. Lyu,M. Maggiora,R. Maiti,S. Maity,R. Manfredi,E. Manoni,A. Manthei,S. Marcello,C. Marinas,L. Martel,A. Martini,T. Martinov,L. Massaccesi,M. Masuda,T. Matsuda,K. Matsuoka,D. Matvienko,S. K. Maurya,J. A. McKenna,F. Meier,M. Merola,F. Metzner,M. Milesi,C. Miller,K. Miyabayashi,R. Mizuk,G. B. Mohanty,N. Molina-Gonzalez,S. Moneta,H. -G. Moser,M. Mrvar,R. Mussa,I. Nakamura,K. R. Nakamura,M. Nakao,H. Nakayama,Y. Nakazawa,A. Narimani Charan,M. Naruki,A. Natochii,L. Nayak,M. Nayak,G. Nazaryan,C. Niebuhr,N. K. Nisar,S. Nishida,S. Ogawa,H. Ono,Y. Onuki,P. Oskin,P. Pakhlov,G. Pakhlova,A. Paladino,A. Panta,E. Paoloni,S. Pardi,K. Parham,H. Park,S. -H. Park,B. Paschen,A. Passeri,S. Patra,S. Paul,T. K. Pedlar,I. Peruzzi,R. Peschke,R. Pestotnik,F. Pham,M. Piccolo,L. E. Piilonen,G. Pinna Angioni,P. L. M. Podesta-Lerma,T. Podobnik,S. Pokharel,L. Polat,C. Praz,S. Prell,E. Prencipe,M. T. Prim,H. Purwar,N. Rad,P. Rados,G. Raeuber,S. Raiz,A. Ramirez Morales,M. Reif,S. Reiter,M. Remnev,I. Ripp-Baudot,G. Rizzo,S. H. Robertson,D. Rodriguez Perez,J. M. Roney,A. Rostomyan,N. Rout,G. Russo,D. A. Sanders,S. Sandilya,A. Sangal,L. Santelj,Y. Sato,V. Savinov,B. Scavino,J. Schueler,C. Schwanda,Y. Seino,A. Selce,K. Senyo,J. Serrano,M. E. Sevior,C. Sfienti,C. P. Shen,X. D. Shi,T. Shillington,J. -G. Shiu,B. Shwartz,A. Sibidanov,F. Simon,J. B. Singh,J. Skorupa,R. J. Sobie,A. Soffer,A. Sokolov,E. Solovieva,S. Spataro,B. Spruck,M. Staric,S. Stefkova,Z. S. Stottler,R. Stroili,J. Strube,Y. Sue,M. Sumihama,K. Sumisawa,W. Sutcliffe,S. Y. Suzuki,H. Svidras,M. Takizawa,U. Tamponi,K. Tanida,H. Tanigawa,F. Tenchini,A. Thaller,R. Tiwary,D. Tonelli,E. Torassa,N. Toutounji,K. Trabelsi,M. Uchida,I. Ueda,Y. Uematsu,T. Uglov,K. Unger,Y. Unno,K. Uno,S. Uno,Y. Ushiroda,S. E. Vahsen,R. van Tonder,G. S. Varner,K. E. Varvell,A. Vinokurova,L. Vitale,V. Vobbilisetti,H. M. Wakeling,E. Wang,M. -Z. Wang,X. L. Wang,A. Warburton,M. Watanabe,S. Watanuki,M. Welsch,C. Wessel,J. Wiechczynski,X. P. Xu,B. D. Yabsley,S. Yamada,W. Yan,S. B. Yang,H. Ye,J. Yelton,J. H. Yin,Y. M. Yook,K. Yoshihara,C. Z. Yuan,Y. Yusa,L. Zani,Y. Zhang,V. Zhilich,Q. D. Zhou,X. Y. Zhou,V. I. Zhukova,R. Zlebcik
PHYSICAL REVIEW LETTERS（2023）
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摘要
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.
