New measurement of B→D*π branching fractions

G. W. Brandenburg,R. A. Briere, Y. S. Gao,D. Y.J. Kim,Richard Wilson, H. Yamamoto,T. E. Browder, F. Li, Y. Li,J. L. Rodriguez,T. Bergfeld,B. I. Eisenstein, J. Ernst,G. E. Gladding,G. D. Gollin,R. M. Hans, E. Johnson,I. Karliner,M. A. Marsh,M.A. Palmer,Mats A Selen,J. J. Thaler,K. W. Edwards,Alain Bellerive, R. Janicek,D. B. MacFarlane,K. W. McLean,P. M. Patel,A. J. Sadoff, R. Ammar,Philip Baringer,Alice Bean,D. Z. Besson, D. Coppage,C. Darling, R. Davis, N. Hancock, S. Kotov,Ilya Kravchenko, N. Kwak,S. Anderson,Yuichi Kubota, M. Lattery,S. J. Lee, J. J. O'Neill, S. Patton,R. Poling,T. Riehle, V. Savinov,A. Smith,M. S. Alam,S. B. Athar, Z. Ling,A. H. Mahmood, H. Severini, S.C. Timm, F. R. Wappler, A. Anastassov, S. Blinov,J. E. Duboscq, K. D. Fisher, D. Fujino, R. Fulton, K. K. Gan,T. Hart,K. Honscheid, H. Kagan, R. D. Kass,Jungil Lee, M. B. Spencer, M. Sung, A. Undrus,R. Wanke, A. Wolf,M. M. Zoeller, B. Nemati,S. J. Richichi,W. R. Ross, P. Skubic,Michael Wood, M. Bishai, J. Fast, E. Gerndt,J. W. Hinson, N. Menon,D. H. Miller,E. I. Shibata, I. P.J. Shipsey, M. Yurko, L. Gibbons,S. D. Johnson, Y. Kwon, S. Roberts,E. H. Thorndike,C. P. Jessop, K. Lingel

Physical Review Letters（1998）

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摘要

The decays ϒ(4S)→BB , followed by B→D^*π and D^*→Dπ, permit reconstruction of all kinematic quantities that describe the sequence without reconstruction of the D, with reasonably low backgrounds. Using an integrated e^+e^- luminosity of 3.1 fb^(-1) accumulated at the ϒ(4S) by the CLEO-II detector, we report measurements of B(B ^0→D^(*+)π^-) = (2.81±0.11±0.21±0.05)×10^(-3) and B(B-→D^*0π^-) = (4.34±0.33±0.34±0.18)×10^(-3).

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