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
We report on measurements of the decays of B¯ mesons into the semileptonic final states B¯→D^(*)π^(+)π^(-)ℓ^(-)ν¯, where D^(*) represents a D or D^(*) meson and ℓ^(-) is an electron or a muon. These measurements are based on 471×10^(6) BB ¯ pairs recorded with the BABAR detector at the SLAC asymmetric B factory PEP-II. We determine the branching fraction ratios R_{π^{+}π^{-}}^{(*)}=B(B[over ¯]→D^{(*)}π^{+}π^{-}ℓ^{-}ν[over ¯])/B(B[over ¯]→D^{(*)}ℓ^{-}ν[over ¯]) using events in which the second B meson is fully reconstructed. We find R_{π^{+}π^{-}}=0.067±0.010±0.008 and R_{π^{+}π^{-}}^{*}=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 ¯]→D^{(*)}ππℓ^{-}ν[over ¯] decays, where π denotes either a π^{±} and π^{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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