Measurement of BD0 → K- π+using partial reconstruction of B̄ → D*+Xl-ν̄

Marina Artuso, F. Azfar, A. Efimov,M. Goldberg,D. He,Sacha E Kopp, G. C. Moneti, R. Mountain,S. Schuh,Tomasz Skwarnicki,Sheldon Stone, G. Viehhauser,Xiangjun Xing, J. Bartelt, S. E. Csorna,Vivek Jain, K. W. McLean,Sz Márka,R. Godang,K. Kinoshita, I. C. Lai, P. Pomianowski,S. Schrenk, G. Bonvicini,D. Cinabro,Richard L. Greene, L. P. Perera, G. J. Zhou,M. Chadha,S. Chan, G. Eigen,J. S. Miller,C. O'Grady, M. Schmidtler,J. Urheim,A. J. Weinstein,Frank Würthwein, D. W. Bliss, G. Masek,H. P. Paar, S. Prell,Vivek Sharma,D. M. Asner, J. Gronberg,T. S. Hill,Dj Lange,R. J. Morrison, H. N. Nelson, T. K. Nelson,D. Roberts,Anders Ryd, R. Balest, B. H. Behrens,W. T. Ford,Harold S. Park, J. Roy,J. G. Smith, J. P. Alexander,R. Baker, C. Bebek, B. E. Berger,Karl Berkelman,Kenneth Bloom, V. Boisvert,D. G. Cassel, D. S. Crowcroft, M. Dickson,S. von Dombrowski,P. S. Drell,K. M. Ecklund,R. Ehrlich, A. D. Foland, P. Gaidarev, L. K. Gibbons, B. Gittelman,S. W. Gray, D. L. Hartill, B. K. Heltsley, P. I. Hopman, J. Kandaswamy,P. C. Kim, D. L. Kreinick,T. Lee,Yanwen Liu, N. B. Mistry,C. R. Ng, E. Nordberg, M. Ogg,Juliet Ritchie Patterson, D. Peterson,D. Riley, A. Soffer, B. Valant-Spaight, C. Ward, M. Athanas,Paul Avery,C. D. Jones, M. Lohner

Physical Review Letters(1998)

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Abstract
We present a measurement of the absolute branching fraction for D^0→K^-π^+ using the reconstruction of the decay chain B →D^(*+)Xl^-ν , D^(*+)→D^0π^+ where only the lepton and the low-momentum pion from the D^(*+) are detected. With data collected by the CLEO II detector at the Cornell Electron Storage Ring, we have determined B(D^0→K^-π^+) = [3.81±0.15(stat)±0.16(syst)]%.
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