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Lees, J P; Tisserand, V; Eigen, G; Stugu, B; Kerth, L T; Kolomensky, Yu G; Lee, M J; Mattison, T S; Druzhinin, V P; Skovpen, Yu I; Franco Sevilla, M; Richman, J D; West, C A; Eisner, A M; Panduro Vazquez, W; Schumm, B A; Röhrken, M; Huard, Z; Pushpawela, B G; Sun, L; Ford, W T; Wagner, S R; Spaan, B; Bernard, D; Bettoni, D; Bozzi, C; Calabrese, R; Cibinetto, G; Calcaterra, A; Finocchiaro, G; Martellotti, S; Zallo, A; Passaggio, S; Bhuyan, B; Prasad, V; Uwer, U; Lacker, H M; Mallik, U; Cochran, J; Gritsan, A V; Arnaud, N; Davier, M; Malaescu, B; Touramanis, C; Fritsch, M; Schubert, K R; Barlow, R J; Lafferty, G D; Hamilton, B; Jawahery, A; Robertson, S H; Palombo, F; Godang, R; Simard, M; Onorato, G; Margoni, M; Morandin, M; Simonetto, F; Ben-Haim, E; Marchiori, G; Biasini, M; Manoni, E; Rossi, A; Angelini, C; Giorgi, M A; Oberhof, B; Rama, M; Walsh, J J; Olsen, J; Anulli, F; Faccini, R; Bünger, C; Dittrich, S; Leddig, T; Waldi, R; Olaiya, E O; Bard, D J; Dubois-Felsmann, G P; Ebert, M; Field, R C; Luitz, S; Pulliam, T; Snyder, A; Randle-Conde, A; Bellis, M; Gorodeisky, R; Soffer, A; Ritchie, J L; Schwitters, R F; Izen, J M; Lou, X C; Bianchi, F; Gamba, D; Martinez-Vidal, F; Albert, J; Banerjee, Sw; King, G J; Kowalewski, R; Lewczuk, M J; Dasu, S
Physical review letters, 2016-Jan-29, Letnik: 116, Številka: 4Journal Article
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(Bover ¯→D^{(*)}π^{+}π^{-}ℓ^{-}νover ¯)/B(Bover ¯→D^{(*)}ℓ^{-}νover ¯) 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 Bover ¯→D^{(*)}ππℓ^{-}νover ¯ 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.
