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arXiv 0909.5111hep-ph
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μ介子g-2、稀有衰变P \to 1 ^+1 ^-和跃迁形状因子P \to γγ^*

Muon g-2, rare decays P \to l^+l^- and transition form factors P \to γγ^*

A. E. Dorokhov

摘要:

测量μ子反常磁矩g-2和轻赝标介子衰变为轻子对P \to l+l-是对标准模型的重要检验。为了减少标准模型预言中的理论不确定性,轻赝标介子跃迁形状因子的数据起着重要的作用。最近,由BABAR协作提供了关于这些形状因子在大动量传递下的行为的新数据。我们评论了这些数据与微扰QCD期望的(不)一致性。

英文摘要:

Measuring the muon anomalous magnetic moment g-2 and the rare decays of light pseudoscalar mesons into lepton pair P \to l+l- serve as important test of the standard model. To reduce the theoretical uncertainty in the standard model predictions the data on the transition form factors of light pseudoscalar mesons play significant role. Recently new data on behavior of these form factors at large momentum transfer was supplied by the BABAR collaboration. We comment on the (in)consistency of these data with perturbative QCD expectation.

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