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arXiv 1001.1883hep-ex
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在窄翻转衰变中寻找带电轻子味破坏

Search for Charged Lepton Flavor Violation in Narrow Upsilon Decays

The BABAR Collaboration, B. Aubert

摘要:

带电轻子味破坏过程在标准模型中是不可观测的,但在标准模型的几个扩展中,包括超对称性和包含轻子夸克或复合的模型中,它们被预测会得到增强。我们在用BABAR探测器收集的99 M Y(2S)和117 M Y(3S)衰变样品中寻找这样的过程。我们在10^(-6)水平上对分支分数BF(Y(nS)-> e τ)和BF(Y(nS)-> mu τ)(n = 2,3)设置上限,并利用这些结果对违反有效算符的带电轻子味的质量标度设置1 TeV量级的下限。

英文摘要:

Charged lepton flavor violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99M Y(2S) decays and 117M Y(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions BF(Y(nS) -> e tau) and BF(Y(nS) -> mu tau) (n = 2, 3) at the 10^(-6) level and use these results to place lower limits of order 1 TeV on the mass scale of charged lepton flavor violating effective operators.

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