Inclusive decays B->DX and B->D*X

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 Ba from Y(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→D*0X) = (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→D*0X)/B(B→D*+X) = (1.03±0.07±0.09±0.08). We also report the first measurement of the momentum-dependent D*0 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 c̄ quarks produced in B decay to be 〈nc〉= 1.10±0.05.