Observation of B→D(*) π^(+)π^(-)ℓ^(-)ν Decays in e^(+)e^(-) Collisions at the Υ(4S) Resonance.

J P Lees,V Poireau, V Tisserand, E Grauges,A Palano, G Eigen, B Stugu,D N Brown,L T Kerth,Yu G Kolomensky,M J Lee, G Lynch, 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,J W Gary,O Long,M Franco Sevilla,T M Hong, D Kovalskyi,J D Richman,C A West,A M Eisner, W S Lockman,W Panduro Vazquez,B A Schumm, A Seiden, D S Chao, C H Cheng, B Echenard, K T Flood,D G Hitlin,J Kim,T S Miyashita, P Ongmongkolkul, F C Porter,M Röhrken,R Andreassen, Z Huard,B T Meadows,B G Pushpawela, M D Sokoloff, L Sun,W T Ford,J G Smith,S R Wagner,R Ayad, W H Toki,B Spaan, D Bernard, M Verderi,S Playfer,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, A Zallo,R Contri,M R Monge,S Passaggio, C Patrignani,B Bhuyan,V Prasad, A Adametz,U Uwer,H M Lacker,U Mallik,C Chen,J Cochran,S Prell,H Ahmed,A V Gritsan,N Arnaud, M Davier, D Derkach, G Grosdidier,F Le Diberder, A M Lutz, B Malaescu, P Roudeau, A Stocchi, G Wormser,D J Lange, D M Wright,J P Coleman, J R Fry, E Gabathuler, D E Hutchcroft,D J Payne, C Touramanis, A J Bevan,F Di Lodovico,R Sacco,G Cowan,D N Brown, 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,B Dey, 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, G Simi, F Simonetto,R Stroili, S Akar, E Ben-Haim, 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,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,D Lopes Pegna,J Olsen, A J S Smith, F Anulli,R Faccini, F Ferrarotto,F Ferroni, M Gaspero,A Pilloni,G Piredda, C Bünger, S Dittrich, O Grünberg,M Hess, T Leddig,C Voß,R Waldi,T Adye, E O Olaiya,F F Wilson,S Emery,G Vasseur,D Aston,D J Bard,C Cartaro,M R Convery,J Dorfan,G P Dubois-Felsmann, 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, V Luth, D B MacFarlane,D R Muller, H Neal,T Pulliam, B N Ratcliff,A Roodman,R H Schindler, A Snyder, D Su,M K Sullivan,J Va'vra,W J Wisniewski, H W Wulsin, M V Purohit, J R Wilson,A Randle-Conde, S J Sekula,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,Sw Banerjee, A Beaulieu, F U Bernlochner, H H F Choi, G J King,R Kowalewski, M J Lewczuk, T Lueck, I M Nugent, J M Roney, R J Sobie,N Tasneem, T J Gershon,P F Harrison, T E Latham,H R Band, S Dasu, Y Pan, R Prepost,S L Wu

PHYSICAL REVIEW LETTERS（2016）

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摘要

We report on measurements of the decays of (B) over bar mesons into the semileptonic final states (B) over bar -> D-(*())pi(+)pi(-)l(-)(nu) over bar, where D-(*()) represents a D or D* meson and l(-) is an electron or a muon. These measurements are based on 471 x 10(6) B (B) over bar pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R-pi+pi-(()*()) = B((B) over bar -> D-(*())pi(+)pi(-)l(-)(nu) over bar /B (B) over bar -> D-(*())l(-)(nu) over bar) using events in which the second B meson is fully reconstructed. We find R pi+pi- = 0.067 +/- 0.010 +/- 0.008 and R pi+pi-* = 0.019 +/- 0.005 +/- 0.004, where the first uncertainty is statistical and the second is systematic. Based on these results and assuming isospin invariance, we estimate that (B) over bar -> D-(*())pi pi l (nu) over bar decays, where pi denotes either a pi(+/-) and pi(0) meson, account for up to half the difference between the measured inclusive semileptonic branching fraction to charm hadrons and the corresponding sum of previously measured exclusive branching fractions.

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