Measurement of the branching fractions for B-→D(*)+π-+ -ν̄ and B0̄→D(*)0π+ -ν̄ and B
Measurement of the branching fractions for B-→D(*)+π-+ -ν̄ and B0̄→D(*)0π+ -ν̄ and B
复制标题
测量 B-→D(*)+π-+ -ν̄ 和 B0̄→D(*)0π+ -ν̄ 和 B 的支化分数
DOI:
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发表时间:
2005
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通讯作者:
et al.
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作者:
The Belle Collaboration D. Liventsev;T. Matsumoto;et al.
We report on a measurement of the branching fractions for B- → D(*)+π- l -vl and B0 → D (*)0π+l-vl with 275 × 106 BB events collected at the γ(4S) resonance with the Belle detector at KEKB. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We obtain B(B- → D+π- l-vl = (0.54±0.07(stat)±0.07(syst)±0.06(BR))× 10 -2, B(B- → D(*)+π- l-vl = (0.67 ±0.11(stat) ±0.09(syst) ±0.03(BR)) × 10-2, B(B0 → D0π+ l -vl) = (0.33 ±0.06(stat) ± 0.06(syst) ±0.03(BR)) × 10-2, B(B0 → D(*)0π+l -vl) = (0.65 ±0.12(stat) ± 0.08(syst) ±0.05(BR)) × 10-2, where the third error comes from the error on B → D(*)l -vl decays. Contributions from B0 → D(*)+l-vl decays are excluded in the measurement of B0 → D0π +l-vl. © 2005 The American Physical Society.