I have some questions about the matrix(adsbygoogle = window.adsbygoogle || []).push({});

[tex]<0|j^{\mu}_5|\pi(p)>=if_{\pi}p^{\mu}[/tex]

1.Pi is a psuedoscalar particle, but the current between vacuum and pi state is an axial one, why not a psuedoscalar one?

And how do we determine the current appearing in the similar matrix like [tex]<0|j|meson>[/tex]

2.The r.h.s is propotional to the momentum of the meson pi, but in the vector current case it is propotional to the polarization and mass

[tex]<0|j^{\mu}|Vector(p)>=if_{V}m_{V}e^{\mu}[/tex], why?

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# Question about the matrix of vacuum to meson

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