Imagine the vertex correction diagram in the pseudo-scalar meson theory.(adsbygoogle = window.adsbygoogle || []).push({});

The amplitude for this diagram is UV divergent. In order to get rid of this divergence we apply regularization technique and obtain the expression with the UV cut-off parameter. The usual practice is that we expand the result in series and extract the finite part for this expression.

In QED this series expansion is performed at zero 3-momenta of participating particles, as the QED coupling constant is obtained from the low-energy experiments.

In the pseudo-scalar meson theory the g_piNN coupling constant is obtained at the chyral limit of QCD (m_pi =0). Therefore, I was advised to make renormalization at zero 4-momentum of participating pion.

Could annybody here give me some links where the renormalization of pseudo-scalar meson theory is discussed? Your opinion on the question is wellcome.

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# Renormalization pseudo-scalar meson theory

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