Using the ARGUS detector at the e+e- storage ring DORIS II at DESY, we have studied the decay B0 → D*+ ℓ- v by exploiting a partial D*+ reconstruction technique. The branching ratio for this mode was thereby determined to be (4.5 ± 0.3 ± 0.4)%. Using the corresponding sample of tagged B0 mesons, we measured the B0B0 mixing parameter to be rd = 0.194 ± 0.062 ± 0.054, a result only weakly dependent upon the ratio of semileptonic widths for and production rates of B0 and B+ mesons. We have also determined the branching ratio Br (B0 → X ℓ-v to be (9.3 ± 1.1 ± 1.5)%. By comparing the results for full and partial D*+ reconstuction we found the absolute branching ratios for D0 → K-π+ and D0 → K- π+π+π- to be (4.5 ± 0.6 ± 0.4)% and (7.9 ± 1.5 ± 0.9)%, respectively.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physics Letters B|
|State||Published - Mar 31 1994|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics