The Inclusive Decays B → DX and B → D ∗ X
نویسندگان
چکیده
We report new measurements of the differential and total branching ratios for inclusive B decay to D, D and D and the first measurement of the same quantities for inclusive B decay to D. 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 is propagated from other measurements): B(B → DX) = (0.636 ± 0.014 ± 0.019 ± 0.018),B(B → DX) = (0.235 ± 0.009 ± 0.009 ± 0.024),B(B → DX) = (0.247 ± 0.012 ± 0.018 ± 0.018),B(B → DX) = (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 → DX)/B(B → DX) = (1.03±0.07±0.09±0.08). We also report the first measurement of the momentumdependent D 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.
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تاریخ انتشار 2008