Search for Lepton Flavor Violation in Upsilon(3S) -> e(+/-)mu(-/+) 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 I Serednyakov , Yu I 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 Röhrken , 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 V 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 , D N Brown , C L Davis , 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 Bünger , S Dittrich , O Grünberg , 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 V 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 PHYSICAL REVIEW LETTERS（2022）
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 Upsilon(3S) -> e(+/-) mu(-/+) in a sample of 118 million gamma(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[Upsilon(3S) -> e(+/-) mu(-/+)] < 3.6 x 10(-7) at 90% C. L. This result can be interpreted as a limit Lambda(NP)/g(NP)(2) > 80 TeV on the energy scale Lambda(NT) divided by the coupling-squared g(NP)(2) of relevant new physics (NP).
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