A study of D*+π- production in semileptonic B decay

D. Buskulic, D. Casper, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J. P. Lees, M. N. Minard, P. Odier, B. Pietrzyk, F. Ariztizabal, M. Chmeissani, J. M. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, V. Gaitan, Ll Garrido, M. Martinez, S. OrteuA. Pacheco, C. Padilla, F. Palla, A. Pascual, J. A. Perlas, F. Sanchez, F. Teubert, D. Creanza, M. de Palma, A. Farilla, G. Iaselli, G. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, G. Bonvicini, M. Cattaneo, P. Comas, P. Coyle, H. Drevermann, A. Engelhardt, R. W. Forty, M. Frank, G. Ganis, M. Girone, R. Hagelberg, J. Harvey, R. Jacobsen, B. Jost, J. Knobloch, I. Lehraus, M. Maggi, C. Markou, E. B. Martin, P. Mato, H. Meinhard, A. Minten, R. Miquel, P. Palazzi, J. R. Pater, P. Perrodo, J. F. Pusztaszeri, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmelling, W. Tejessy, I. R. Tomalin, R. Veenhof, A. Venturi, H. Wachsmuth, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadin-Otwinowska, A. Barres, C. Boyer, A. Falvard, P. Gay, C. Guicheney

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In a sample of 1.5 million hadronic decays of the Z collected by the ALEPH detector, a search is carried out for the decays B → D10(2420)l-νX and B → D2*0(2460)l-νX. The product branching ratio for D10 production is measured to be Br(b → B) × Br(B → D10l-νX) × Br(D10 → D*+π-) = (2.04 ± 0.58stat ± 0.34syst) × 10-3, and a 95% confidence level limit of Br(b → B) × Br(B → D2*0l-νX) × Br(D2*0 → D*+π-) ≤ 0.81 × 10-3 is obtained for D2*0 production. A topological search sensitive to the processes above, but also to wide resonances that decay to D*+π- and to non-resonant D*+π- production is also carried out, yielding Br(b→ B) ×Br(B →D*+π-l-νX)= (3.7 ± 1.0stat ± 0.7syst) × 10-3. Direct evidence of D*π production inconsistent with D10 and D2*0 in semileptonic B decay is presented. © 1995.
Original languageEnglish
Pages (from-to)103-114
JournalPhysics Letters B
Issue number1
Publication statusPublished - 2 Feb 1995


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