Measurement of the branching fractions of the radiative leptonic τ decays τ → e γ ν ν ¯ and τ → μ γ ν ν ¯ at BABAR S Akar , E Benhaim , M Bomben , G R Bonneaud , H Briand , G Calderini , J Chauveau , Ph Leruste , G Marchiori , J Ocariz , M Biasini , E Manoni , A Rossi , C Angelini , H Koch , T Schroeder , C Hearty , T S Mattison , J A Mckenna , R Y So , A Khan , V E Blinov , A R Buzykaev , V P Druzhinin , V B Golubev , 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 , G Batignani , S Bettarini , M Carpinelli , G Casarosa , M Chrzaszcz , F Forti , M A Giorgi , A Lusiani , B Oberhof , E Paoloni , G Rizzo , J Walsh , D Lopes Pegna , James Olsen , A J S Smith , F Anulli , R Faccini , F Ferrarotto , F Ferroni , C Patrignani , B Bhuyan , S Passaggio , M R Monge , R Contri , A Zallo , M Rama , J 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 , S Prell , H Ahmed , A V Gritsan , N Arnaud , M Davier , D Derkach , G Grosdidier , M Piccolo , I M Peruzzi , P Patteri , S Martellotti , G Finocchiaro , R De Sangro , A Calcaterra , V Prasad , V Santoro , L Piemontese , E Luppi , I Garzia , E Fioravanti , G Cibinetto , R Calabrese , A Adametz , U Uwer , H M Lacker , U Mallik , Chu Chen , J Cochran , J Va Vra , M K Sullivan , C Bozzi , D Bettoni , S Playfer , M Verderi , D Bernard , B Spaan , J R Wilson , M V Purohit , H W Wulsin , W J Wisniewski , D Su , A Snyder , R H Schindler , A Roodman , B N Ratcliff , T Pulliam , M Perl , H A Neal , D R Muller , D B Macfarlane , H L Lynch , V Luth , S Luitz , D Lindemann , D W G S Leith , P Kim , M Gaspero , A Pilloni , G Piredda , C Bunger , S Dittrich , F Le Diberder , A M Lutz , B Malaescu , P Roudeau , A Stocchi , G Wormser , D J Lange , W H Toki , R Ayad , S R Wagner , D M Wright , J G Smith , A Gaz , W T Ford , P C Bloom , L Sun , M D Sokoloff , J P Coleman , J R Fry , E Gabathuler , D E Hutchcroft , D J Payne , F Bianchi , F De Mori , A Filippi , C Vos , R Waldi , T Adye , E O Olaiya , F F Wilson , S Emery , B G Pushpawela , B T Meadows , Z Huard , R Andreassen , M Rohrken , F C Porter , P Ongmongkolkul , T S Miyashita , D G Hitlin , K T Flood , B Echenard , C H Cheng , D S Chao , A Seiden , B A Schumm , W Panduro Vazquez , W S Lockman , A M Eisner , C A West , J D Richman , D Kovalskyi , T M Hong , G Vasseur , D Aston , D J Bard , C Cartaro , M R Convery , D Gamba , L Lanceri , L Vitale , F Martinezvidal , A Oyanguren , P Villanuevaperez , J Albert , Sw Banerjee , A Beaulieu , F U Bernlochner , H H F Choi , M Franco Sevilla , O Long , O Grunberg , G J King , M Hess , T Leddig , E M T Puccio , M S Alam , A Randleconde , S J Sekula , M Bellis , P R Burchat , R Kowalewski , M J Lewczuk , T Lueck , I M Nugent , J M Roney , R Sobie , V Tisserand , E Grauges , A Palano , G Eigen , B Stugu , D N Brown , L T Kerth , Yu G Kolomensky , M J Lee , G Lynch , G Simi , F Simonetto , R Stroili , N Tasneem , T Gershon , P F Harrison , T E Latham , H R Band , S Dasu , Y Pan , R Prepost , Sau Lan Wu , W R Innes , C Hast , M T Graham , B G Fulsom , J Dorfan , G P Duboisfelsmann , W Dunwoodie , M Ebert , R C Field , C Touramanis , A J Bevan , F Di Lodovico , R Sacco , G Cowan , C L Davis , A G Denig , M Fritsch , W Gradl , K Griessinger , A Hafner , K R Schubert , R J Barlow , G D Lafferty , R Cenci , B Hamilton , A Jawahery , D A Roberts , R Cowan , R Cheaib , P M Patel , S H Robertson , N Neri , F Palombo , L Cremaldi , R Godang , D J Summers , M Simard , P Taras , G De Nardo , G Onorato , C Sciacca , G Raven , C P Jessop , J M Losecco , K Honscheid , R Kass , M Margoni , M Morandin , M Posocco , M Rotondo , J P Lees , V Poireau Physical Review D（2015）
摘要
We perform a measurement of the τ → lγνν¯ (l = e,μ) branching fractions for a minimum photon energy of 10 MeV in the τ rest frame, using 431 fb–1 of e+e– collisions collected at the center-of-mass energy of the Υ(4S) resonance with the BABAR detector at the PEP-II storage rings. We find B(τ → μγνν¯) = (3.69±0.03±0.10)×10–3 and B(τ → eγνν¯)=(1.847±0.015±0.052)×10–2, where the first quoted error is statistical and the second is systematic. In addition, these results are substantially more precise than previous measurements.
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