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A study of $D^{\star +}\pi^-$ production in semileptonic B decay

Authors
Keywords
  • [Phys:Hexp] Physics/High Energy Physics - Experiment
  • [Phys:Hexp] Physique/Physique Des Hautes Energies - ExpéRience

Abstract

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-PPE/94-173 7 November 1994 A Study of D �+ � � Production in Semileptonic B Decay The ALEPH Collaboration � Abstract 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! D 0 1 (2420)` � �X and B! D �0 2 (2460)` � �X. The product branching ratio for D 0 1 production is measured to be Br(b! B) � Br(B!D 0 1 ` � �X) � Br(D 0 1 !D �+ � � ) = (2:04� 0:58 stat � 0:34 syst )� 10 �3 ; and a 95% con�dence level limit of Br(b! B) � Br(B!D �0 2 ` � �X) � Br(D �0 2 !D �+ � � ) � 0:81� 10 �3 is obtained for D �0 2 production. A topological search sensitive to the processes above, but also to wide resonances that decay to D �+ � � and to non-resonant D �+ � � production is also carried out, yielding Br(b! B)�Br(B!D �+ � � ` � �X)= (3:7� 1:0 stat � 0:7 syst )� 10 �3 . Direct evidence of D � � production inconsistent with D 0 1 and D �0 2 in semileptonic B decay is presented. Submitted to Physics Letters B � See following pages for the author list. The ALEPH Collaboration D. Buskulic, D. Casper, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J.-P. Lees, M.-N. Minard, P. Odier, B. Pietrzyk Laboratoire de Physique des Particules (LAPP), IN 2 P 3 -CNRS, 74019 Annecy-le-Vieux Cedex, France F. Ariztizabal, M. Chmeissani, J.M. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, V. Gaitan, Ll. Garrido, 15 M. Martinez, S. Orteu, A. Pacheco, C. Padilla, F. Palla, A. Pascual, J.A. Perlas, F. Sanchez, F. Teubert Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, 08193 Bellaterra (Barcelona), Spain 7 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. Sel

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