Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. D 56, 3783 (1997). Permission to use. Copyright © 1997 American Physical Society.


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 Bd and Bu 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(BD0X)=(0.636±0.014±0.019±0.018), B(BD+X)=(0.235±0.009±0.009 ±0.024), B(BD0X)=(0.247±0.012±0.018±0.018), B(BD+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(BD0X)/B(BD+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 quarks produced in B decay to be <nc>=1.10±0.05.

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