Search for Lepton Flavor Violation in (3S) E?

J. P. Lees,V Poireau,V Tisserand,E. Grauges,A. Palano,G. Eigen,D. N. Brown,Yu G. Kolomensky,M. Fritsch,H. Koch,T. Schroeder,R. Cheaib,C. Hearty,T. S. Mattison,J. A. McKenna,R. Y. So,V. E. Blinov,A. R. Buzykaev,V. P. Druzhinin,V. B. Golubev,E. A. Kozyrev,E. A. Kravchenko,A. P. Onuchin,S. Serednyakov,Yu Skovpen,E. P. Solodov,K. Yu Todyshev,A. J. Lankford,B. Dey,J. W. Gary,O. Long,A. M. Eisner,W. S. Lockman,W. Panduro Vazquez,D. S. Chao,C. H. Cheng,B. Echenard,K. T. Flood,D. G. Hitlin,J. Kim,Y. Li,D. X. Lin,S. Middleton,T. S. Miyashita,P. Ongmongkolkul,J. Oyang,F. C. Porter,M. Rohrken,Z. Huard,B. T. Meadows,B. G. Pushpawela,M. D. Sokoloff,L. Sun,J. G. Smith, S. R. Wagner,D. Bernard,M. Verderi,D. Bettoni,C. Bozzi,R. Calabrese,G. Cibinetto,E. Fioravanti,I Garzia,E. Luppi,V Santoro,A. Calcaterra,R. de Sangro,G. Finocchiaro,S. Martellotti,P. Patteri,I. M. Peruzzi,M. Piccolo,M. Rotondo,A. Zallo,S. Passaggio, C. Patrignani,B. J. Shuve,H. M. Lacker,B. Bhuyan,U. Mallik,C. Chen,J. Cochran, S. Prell,A. Gritsan,N. Arnaud,M. Davier,F. Le Diberder,A. M. Lutz,G. Wormser,D. J. Lange,D. M. Wright,J. P. Coleman,E. Gabathuler,D. E. Hutchcroft,D. J. Payne,C. Touramanis,A. J. Bevan,F. Di Lodovico,R. Sacco,G. Cowan,Sw Banerjee,A. G. Denig,W. Gradl,K. Griessinger,A. Hafner,K. R. Schubert,R. J. Barlow,G. D. Lafferty,R. Cenci,A. Jawahery,D. A. Roberts,R. Cowan,S. H. Robertson, R. M. Seddon,N. Neri,F. Palombo,L. Cremaldi,R. Godang,D. J. Summers,P. Taras,G. De Nardo,C. Sciacca,G. Raven,C. P. Jessop,J. M. LoSecco,K. Honscheid,R. Kass,A. Gaz,M. Margoni,M. Posocco,G. Simi,F. Simonetto,R. Stroili,S. Akar,E. Ben-Haim,M. Bomben,G. R. Bonneaud, G. Calderini,J. Chauveau,G. Marchiori,J. Ocariz,M. Biasini,E. Manoni,A. Rossi,G. Batignani,S. Bettarini,M. Carpinelli,G. Casarosa,M. Chrzaszcz,F. Forti,M. A. Giorgi,A. Lusiani,B. Oberhof,E. Paoloni,M. Rama,G. Rizzo,J. J. Walsh,L. Zani,A. J. S. Smith,F. Anulli,R. Faccini,F. Ferrarotto,F. Ferroni,A. Pilloni,G. Piredda, C. Bunger,S. Dittrich,O. Grunberg,M. Hess,T. Leddig,C. Voss,R. Waldi,T. Adye,F. F. Wilson,S. Emery,G. Vasseur, D. Aston,C. Cartaro,M. R. Convery,J. Dorfan,W. Dunwoodie,M. Ebert,R. C. Field,B. G. Fulsom,M. T. Graham,C. Hast,W. R. Innes,P. Kim,D. W. G. S. Leith,S. Luitz,D. B. MacFarlane,D. R. Muller,H. Neal,B. N. Ratcliff,A. Roodman,M. K. Sullivan,J. Va'vra,W. J. Wisniewski,M. Purohit,J. R. Wilson,A. Randle-Conde,S. J. Sekula,H. Ahmed,M. Bellis,P. R. Burchat, E. M. T. Puccio,M. S. Alam,J. A. Ernst, R. Gorodeisky,N. Guttman,D. R. Peimer,A. Soffer,S. M. Spanier,J. L. Ritchie,R. F. Schwitters,J. M. Izen,X. C. Lou,F. Bianchi,F. De Mori,A. Filippi,D. Gamba,L. Lanceri,L. Vitale,F. Martinez-Vidal,A. Oyanguren,J. Albert, A. Beaulieu,F. U. Bernlochner,G. J. King,R. Kowalewski,T. Lueck,I. M. Nugent,J. M. Roney,R. J. Sobie,N. Tasneem,T. J. Gershon,P. F. Harrison,T. E. Latham,R. Prepost,S. L. Wu,C. L. Davis

Physical review letters（2022）

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摘要

We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a b quark and b antiquark bound state. We look for the LFV decay ϒ(3S)→e^{±}μ^{∓} in a sample of 118 million ϒ(3S) mesons from 27 fb^{-1} of data collected with the BABAR detector at the SLAC PEP-II e^{+}e^{-} collider operating with a 10.36 GeV center-of-mass energy. No evidence for a signal is found, and we set a limit on the branching fraction B[ϒ(3S)→e^{±}μ^{∓}]<3.6×10^{-7} at 90% C. L. This result can be interpreted as a limit Λ_{NP}/g_{NP}^{2}>80 TeV on the energy scale Λ_{NP} divided by the coupling-squared g_{NP}^{2} of relevant new physics (NP).

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