Evidence of $B^+ \to \tau^+\nu$ decays with hadronic B tags J P Lees , G Simi , S Playfer , T E Latham , G Marchiori , R Prepost , A J Martinez , A V Gritsan , R H Schindler , D Monorchio , M Martinelli , P Ongmongkolkul , E Torrence , C C Young , A Adametz , R Godang , R Faccini , R Kowalewski , F Ferroni , D J Lange , T S Miyashita , F C Porter , P Roudeau , W S Lockman , A Lusiani , S Dasu , A Palano , G Grosdidier , J M Losecco , V Poireau , M Piccolo , M Carpinelli , D J Bard , J P Coleman , N Arnaud , R M White , M Franco Sevilla , V Ziegler , T Leddig , P Kim , G Sciolla , G Hamel De Monchenault , S Pacetti , S R Wagner , James Olsen , F Forti , S Akar , C L Lee , Ch Yeche , H Ahmed , R Kroeger , T Schroeder , S Prell , W T Ford , C Angelini , J G Smith , G Cowan , D Lopes Pegna , E Gabathuler , N Guttman , E M T Puccio , P C Bloom , D Kovalskyi , D E Hutchcroft , M Rotondo , R F Schwitters , C Hast , M L Kocian , E Grauges , A Snyder , D Derkach , E Fioravanti , Sau Lan Wu , A J Edwards , D Bettoni , A Perez , E Prencipe , H M Lacker , A V Telnov , Yu I Skovpen , S J Sekula , A Calcaterra , J Chauveau , M V Purohit , C Voss , M Wittgen , J Kroseberg , M Margoni , Feng Liu , M Davier , J Brau , T Adye , W T Meyer , S Sitt , I Garzia , B Spaan , G Vasseur , G J King , A M Eisner , V P Druzhinin , M Bomben , J Ocariz , J F Benitez , E O Olaiya , G De Nardo , M Rama , R Cowan , A Zallo , D J Asgeirsson , A Hafner , R Waldi , C A West , Z Huard , S Luitz , C Bozzi , U Nauenberg , Ph Leruste , A J Bevan , B Hamilton , E P Solodov , F Martinezvidal , M Posocco , M Lo Vetere , A M Lutz , M Perl , P Lewis , G Rizzo , D Kirkby , D A Roberts , E Luppi , E Robutti , L T Kerth , J W Gary , C Cartaro , G Wormser , S Emery , R Y So , D Lindemann , A Jawahery , B A Schumm , R Ayad , D W G S Leith , R Cenci , J A Mckenna , L Piemontese , B C Wray , A N Yushkov , G Batignani , N B Sinev , T Gershon , D B Macfarlane , C P Jessop , M H Schune , H H F Choi , P R Burchat , A G Denig , J L Ritchie , N Neri , G Cibinetto , F Simonetto , M K Sullivan , K Yu Todyshev , G Raven , C A Chavez , A M Gabareen , V Luth , W Park , R Sobie , K Honscheid , D R Muller , K T Flood , L Vitale , F Bianchi , B Oberhof , M Mandelkern , D G Hitlin , M T Graham , D Aston , E Benhaim , I M Peruzzi , R C Field , G P Duboisfelsmann , L Li Gioi , F Le Diberder , R Schwierz , G Eigen , E Guido , C Patrignani , P Lund , M Verderi , M Morandin , E Manoni , E Feltresi , T Pulliam , R Cheaib , S I Serednyakov , A Stocchi , R Kass , M R Monge , R Baldiniferroli , M D Sokoloff , R J Barlow , B Echenard , F Di Lodovico , F F Wilson , T Hartmann , F Anulli , W Gradl , M H Kelsey , A J S Smith , R De Sangro , J Dorfan , B G Fulsom , D S Chao , K Griessinger , R Frey , B T Meadows , W R Innes , M A Mazzoni , H Atmacan , J Vavra , H R Band , B N Ratcliff , S Bettarini , Z J Guo , P Grenier , Derek Strom , B Stugu , J Walsh , A Randleconde , G Finocchiaro , M Sigamani , A Seiden , T S Mattison , M Ebert , D Bernard , E Behn , V E Blinov , R Gorodeisky , D Gamba , B Lindquist , Sw Banerjee , R Contri , P Sonnek , M S Alam , E Paoloni , M J Lewczuk , K R Schubert , W Dunwoodie , O Grunberg , Y Pan , L Lanceri , H Briand , O Long , R Calabrese , A Oyanguren , G Onorato , G Calderini , L Cremaldi , R Stroili , A J Lankford , J M Izen , W J Wisniewski , M Biasini , C Chen , A M Ruland , A Khan , Lingfen Sun , X C Lou , A Y Rakitin , V Santoro , P Biassoni , H Schroder , C Sciacca , A P Onuchin , F U Bernlochner , R Andreassen , I M Nugent , D M Wright , A R Buzykaev , S H Robertson , S Zambito , P Taras , D J Summers , G M Vitug , A Wagner , J Cochran , M Gaspero , A M Rossi , V Prasad , H Koch , J Albert , H L Lynch , P J Clark , J D Richman , S Nelson , E A Kravchenko , V B Golubev , J R Fry , M Bondioli , N Gagliardi , D Su , D R Peimer , P Patteri , B Bhuyan , W F Wang , C H Cheng , David Nathan Brown , Yu G Kolomensky , M A Giorgi , P D Dauncey , R Sacco , B Malaescu , A Roodman , P F Harrison , H W Wulsin , G R Bonneaud , A E Rubin , A Cervelli , G Lynch , Graham S Jackson , A A Salnikov , C Dallapiccola , T M Hong , A Gaz , R Bartoldus , C Campagnari , J Garra Tico , J Ernst , T Lueck , U Uwer , F Palombo , V Tisserand , G Casarosa , C Touramanis , S Passaggio , W H Toki , Mark A Bellis , Poulam M Patel , D J Payne , H Neal , G Piredda , D Dujmic , S M Spanier , M Munerato , U Mallik , F Ferrarotto , C Bunger , C Hearty , J M Roney , C L Davis , O Hamon , M Simard , G D Lafferty , A Soffer , J R Wilson , M Fritsch , N Tasneem , M Morii , M R Convery , X Nguyen , S Stracka PHYSICAL REVIEW D（2013）
摘要
We present a search for the decay B+ -> tau(+)nu using 467.8 x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B- in the hadronic decay mode (B- -> D-(*X-)0(-) and B- -> J/psi X-). We examine the rest of the event to search for a B+ -> tau(+)nu decay. We identify the tau(+) lepton in the following modes: tau(+) -> e(+)nu(nu) over bar, tau(+) -> mu(+)nu(nu) over bar, tau(+) -> pi(+)(nu) over bar and tau(+) -> rho(+)(nu) over bar. We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8 sigma (including systematic uncertainties) and corresponds to a branching fraction value of B(B+ -> tau(+)nu) = (1.83(-0.49)(+0.53)(stat) +/- 0.24(syst)) x 10(-4).
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