Precision Measurement Of The Ratio B(Gamma(3s) -> Tau(+)Tau(-))/B(Gamma(3s) -> Mu(+)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,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,A Sibidanov,R J Sobie,N Tasneem,T J Gershon,P F Harrison,T E Latham,R Prepost,S L Wu

PHYSICAL REVIEW LETTERS（2020）

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摘要

We report on a precision measurement of the ratio R-tau mu(gamma(3s)) = B(gamma(3S) -> tau(+)tau(-))/B(tau(gamma(3S) ->mu(+)mu(-)) using data collected with the BABAR detector at the SLAC PEP-II e(+)e(-) collider. The measurement is based on a 28 fb(-1) data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million gamma(35) mesons. The ratio is measured to be R-tau mu(gamma(3s)) = 0.966 +/- 0.008(stat) +/- 0.014(syst) and is in agreement with the standard model prediction of 0.9948 within 2 standard deviations. The uncertainty in R-tau mu(gamma(3s)) is almost an order of magnitude smaller than the only previous measurement.

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precision,ratio,measurement,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml

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