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πe3Form Factorf-Near the Mass Shell

机译:πe3形状因子f-质量壳附近

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The generalized Ward-Takahashi identity (gWTI) in the pion sector for broken isotopic symmetry is derived and used for the model-independent calculation of the longitudinal form factorf-of theπe3vector vertex. The on-shellf-is found to be proportional to the mass difference of the pions and the difference between the vector isospinT=1and scalar isospinT=2pion radii. A numerical estimate of the form factor yields a value two times higher than the previous estimate from the quark model. Off-shell form factors are known to be ambiguous because of the gauge dependence and the freedom in the parameterization of the fields. The near-mass-shellf-appears to be an exception, allowing for experimental verification of the consequences of the gWTI. We calculate the near-mass-shellf-using the gWTI and dispersion techniques. The results are discussed in the context of the conservation of vector current (CVC) hypothesis.
机译:推导了在π界中用于打破同位素对称性的π界中的广义Ward-Takahashi身份(gWTI),并将其用于πe3向量顶点的纵向形状因子f的与模型无关的计算。发现壳上f-正比于pions的质量差以及矢量isospinT = 1和标量isospinT = 2pion半径之间的差。形状因数的数字估计值比夸克模型先前的估计值高两倍。由于规格的依赖性和字段参数化的自由度,已知脱壳形状因数不明确。接近质量的shellf似乎是一个例外,可以对gWTI的后果进行实验验证。我们使用gWTI和分散技术计算接近质量的shellf。在矢量电流(CVC)假设守恒的背景下讨论了结果。

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