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arXiv 1204.2852hep-ex
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B+/-到h+/-τ l衰变模式的研究

A search for the decay modes B+/- to h+/- tau l

The BABAR Collaboration

摘要:

我们提出了一个搜索轻子味违反衰变模式B+/-h+/-τ l(h= K,π; l= e,μ)使用的BaBar数据样本,这对应于4.72亿BBbar对。搜索使用的事件,其中一个B介子是完全重建在几个强子的最终状态之一。使用重建的B,h和l候选者的动量,我们能够完全确定tau四动量。所得到的tau候选质量是我们针对组合背景的主要判别式。我们没有发现B+/-到h+/- tau 1衰变的证据,并将每个分支分数的90%置信水平上限设定为10^-5的几倍。

英文摘要:

We present a search for the lepton flavor violating decay modes B+/- to h+/- tau l (h= K,pi; l= e,mu) using the BaBar data sample, which corresponds to 472 million BBbar pairs. The search uses events where one B meson is fully reconstructed in one of several hadronic final states. Using the momenta of the reconstructed B, h, and l candidates, we are able to fully determine the tau four-momentum. The resulting tau candidate mass is our main discriminant against combinatorial background. We see no evidence for B+/- to h+/- tau l decays and set a 90% confidence level upper limit on each branching fraction at the level of a few times 10^-5.

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