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arXiv 0909.5689hep-ex
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BABAR处B+ -> l+ nu γ衰变的模型无关结果

Model-independent results for the decay B+ -> l+ nu gamma at BABAR

D. M. Lindemann

摘要:

我们提出了一个搜索的辐射轻子衰变B+ -> e+ nu γ和B+ -> mu+ nu γ使用的数据收集的BABAR探测器在PEP-Ⅱ B工厂。我们完全重建了Upperdance(4S)-> B+B-中一个B介子的强子衰变,然后在事件的其余部分中寻找信号衰变的证据。这种方法提供了干净的运动学信息的信号的丢失的能量和高动量光子和轻子,并允许一个独立的模型分析这种衰变。使用4.65亿个B介子对的数据样本,我们获得了与标准模型预测的相同量级的分支分数的灵敏度。我们报告了在90%置信水平下BR(B+ -> l+ nu gamma)< 15.6e-6(l= e或mu)的模型无关分支分数上限。

英文摘要:

We present a search for the radiative leptonic decays B+ -> e+ nu gamma and B+ -> mu+ nu gamma using data collected by the BABAR detector at the PEP-II B factory. We fully reconstruct the hadronic decay of one of the B mesons in Upsilon(4S) -> B+B- and then search for evidence of the signal decay within the rest of the event. This method provides clean kinematic information on the signal's missing energy and high momentum photon and lepton, and allows for a model-independent analysis of this decay. Using a data sample of 465 million B-meson pairs, we obtain sensitivity to branching fractions of the same order as predicted by the Standard Model. We report a model-independent branching fraction upper limit of BR(B+ -> l+ nu gamma) < 15.6e-6 (l= e or mu) at the 90% confidence level.

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