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
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测量 B-→D(*)+π-+ -ν̄ 和 B0̄→D(*)0π+ -ν̄ 和 B 的支化分数

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2005
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作者:
The Belle Collaboration D. Liventsev;T. Matsumoto;et al.

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本文报道了用KEKB的贝儿探测器在γ(4S)共振条件下收集的275 × 106个BB事例,测量了B- → D(*)+π-1-vl和B_0 → D(*)0π+1-vl的分支分数。事件的标记完全重建的B介子在强子模式。我们得到B(B- → D+π- l-vl =(0.54±0.07(stat)±0.07(syst)±0.06(BR))× 10 - 2,B(B- → D(*)+π-1-vl =(0.67 ±0.11(静态)±0.09(系统)±0.03(BR))× 10-2,B(B0 → D0π+1-v1)=(0.33 ±0.06(静态)± 0.06(系统)±0.03(BR))× 10-2,B(B 0 → D(*)0π+1-vl)=(0.65 ±0.12(stat)± 0.08(syst)±0.05(BR))× 10-2,其中第三个误差来自B → D(*)1-vl衰变的误差。在B 0 → D 0 π +l-vl的测量中排除了来自B 0 → D(*)+l-vl衰变的贡献。2005年美国物理学会。
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.