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arXiv 0910.4301hep-ex
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使用完整重建标签测量B -> D^(*)tau nu

Measurement of B -> D^(*) tau nu using full reconstruction tags

I. Adachi

摘要:

我们利用KEKB非对称能量e^+e^-对撞机上Belle探测器在Upperion(4S)共振下收集的604.5 fb^-1的数据,对B -> D^* tau nu和B -> D tau nu衰变进行了测量。事件的标签完全重建的B介子在强子模式。我们得到Br(B^+ -> D^0-bar τ ^+ nu)=(1.51 +0.41/-0.39 +0.24/-0.19 +/- 0.15)%,溴(B^+ -> D^*0-bar tau^+ nu)=(3.04 +0.69/-0.66 +0.40/-0.47 +/- 0.22)%,Br(B^0 -> D^- tau^+ nu)=(1.01 +0.46/-0.41 +0.13/-0.11 +/- 0.10)%,溴(B^0 -> D^*- tau^+ nu)=(2.56 + 0.75/-0.66 +0.31/-0.22 +/- 0.10)%,其中第一个误差是统计误差,第二个误差是系统误差,第三个误差是由于归一化模式的分支分数的不确定性。

英文摘要:

We present measurements of B -> D^* tau nu and B -> D tau nu decays using 604.5 fb^-1 of data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We obtain Br(B^+ -> D^0-bar tau^+ nu) = (1.51 +0.41/-0.39 +0.24/-0.19 +/- 0.15)%, Br(B^+ -> D^*0-bar tau^+ nu) = (3.04 +0.69/-0.66 +0.40/-0.47 +/- 0.22)%, Br(B^0 -> D^- tau^+ nu) = (1.01 +0.46/-0.41 +0.13/-0.11 +/- 0.10)%, Br(B^0 -> D^*- tau^+ nu) = (2.56 +0.75/-0.66 +0.31/-0.22 +/- 0.10)%, where the first error is statistical, the second is systematic, and the third is due to the uncertainty in the branching fraction for the normalization mode.

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