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Observation of [bar over B] → D[superscript (*)]π[superscript +]π[superscript −]ℓ[superscript −][bar over ν] Decays in e[superscript +]e[superscript −] Collisions at the Υ(4S) Resonance

J. P. Lees, V. Poireau, V. Tisserand, E. Graugés, A. Palano, G. Eigen, B. Stugu, Douglas Brown, L. T. Kerth, Yu. G. Kolomensky, M. J. Lee, G. Lynch, H. Koch, T. Vazquez Schroeder, C. Hearty, T. S. Mattison, J. A. McKenna, R. Y. So, A. Khan, V. E. Blinov, А. Р. Бузыкаев, В. П. Дружинин, V. B. Golubev, Е. А. Кравченко, А. П. Онучин, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev, W. T. Ford, J. W. Gary, O. Long, M. Franco Sevilla, Tao Hong, D. Kovalskyi, J. Richman, Christopher West, A. M. Eisner, W. S. Lockman, J. G. 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. 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. Lacker, U. Mallik, C. Chen, J. F. Cochran, S. Prell, H. Ahmed, A. V. Gritsan, N. Arnaud, M. Davier, Д. Деркач, 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. Hutchcroft, D. J. Payne, 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. Lafferty, R. Cenci, B. Hamilton, A. Jawahery, Douglas A. Roberts, R. Cheaib, P. M. Patel, S. H. Robertson, B. Dey, N. Néri, 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, Robert E. 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, Janic Chauveau, Ph. Leruste, G. Marchiori, J. Ocariz, M. Biasini, E. Manoni, AC Rossi, C. Angelini, G. Batignani, S. Bettarini, M. Carpinelli, G. Casarosa, M. Chrząszcz, F. Forti, M. A. Giorgi, A. Lusiani, B. Oberhof, E. Paoloni, M. Rama, G. Rizzo, J. Walsh, D. Lopes Pegna, J. Olsen, A. 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. Convery, J. Dorfan, G. P. Dubois-Felsmann, W. Dunwoodie, M. Ebert, R. C. Field, B. Fulsom, M. T. Graham, C. Hast, W. R. Innes, P. Kim, D. W. G. S. Leith, S. Luitz, V. Lüth, D. B. MacFarlane, D.R. Muller, H. A. 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. Ernst, R. Gorodeisky, Newman 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. Martínez-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. Sobie, N. Tasneem, T. Gershon, P. F. Harrison, T. Latham, H. R. Band, S. Dasu, Y.L. Pan, R. Prepost, Shu-Hao Wu, R. Cowan

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Abstract

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

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

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

Key concepts: Bar (unit), Resonance (particle physics), Chemistry, Physics, Atomic physics, Meteorology

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Observation of [bar over B] → D[superscript (*)]π[superscript +]π[superscript −]ℓ[superscript −][bar over ν] Decays in e[superscript +]e[superscript −] Collisions at the Υ(4S) Resonance — Research Paper | ScholarLens