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arXiv 0804.0831hep-ex
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搜索B+ -> D*+ pi0衰变

Search for B+ -> D*+ pi0 decay

Belle Collaboration, M. Iwabuchi, M. Nakao

摘要:

我们报告的搜索双Cabibbo抑制衰变B+ -> D*+ π 0,基于数据样本的6.57亿BBbar对收集在Uppressive(4S)共振与贝尔探测器在KEKB非对称能量e+ e-对撞机。我们没有发现明显的信号,并在90%的置信水平下将Br(B+ -> D*+ pi 0)的上限设为< 3.6 x 10^-6。该极限可用于在90%置信水平下约束受抑制的和有利的B -> D* pi衰减幅度之间的比率,r < 0.051。

英文摘要:

We report on a search for the doubly Cabibbo suppressed decay B+ -> D*+ pi0, based on a data sample of 657 million BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+ e- collider. We find no significant signal and set an upper limit of Br(B+ -> D*+ pi0) < 3.6 x 10^-6 at the 90% confidence level. This limit can be used to constrain the ratio between suppressed and favored B -> D* pi decay amplitudes, r < 0.051, at the 90% confidence level.

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