Inclusive decays B→DX and B→D*X

Authors

L. Gibbons, University of Rochester, Rochester, New York
Kenneth A. Bloom, University of Nebraska-LincolnFollow
CLEO Collaboration

Document Type

Article

Date of this Version

10-1-1997

Comments

Published by American Physical Society. Phys. Rev. D 56, 3783 (1997). Permission to use. http://prd.aps.org/. Copyright © 1997 American Physical Society.

Abstract

We report new measurements of the differential and total branching ratios for inclusive B decay to D⁰, D⁺, and D*⁺ and the first measurement of the same quantities for inclusive B decay to D*⁰. Here B is the mixture of B_d and B_u from Υ(4S) decay. Furthermore, since more than one charm particle (or antiparticle) of the same kind can be produced in B decay, here ‘‘inclusive B branching ratio’’ is used to mean the average number of charm particles and their antiparticles of a certain species produced in B decay. We obtain the following results (the first error is statistical, the second systematic of this analysis, the third propagated from other measurements): B(B→D⁰X)=(0.636±0.014±0.019±0.018), B(B→D⁺X)=(0.235±0.009±0.009 ±0.024), B(B→D⁰X)=(0.247±0.012±0.018±0.018), B(B→D⁺X)=(0.239±0.011±0.014±0.009). The following ratio of branching ratios is not affected by most of the systematic errors: B(B→D⁰X)/B(B→D⁺X)=(1.03±0.07±0.09±0.08). We also report the first measurement of the momentum-dependent D⁰ polarization and a new measurement of the D⁺ polarization in inclusive B decay. Using these measurements and other CLEO results and making some additional assumptions, we calculate the average number of c and cˉ quarks produced in B decay to be <nc>=1.10±0.05.