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## Main Question or Discussion Point

Hi physics forum,

I have been reading David Griffith's book "intro to elementary particles" and he

describes the decay of the pi-meson as "pure axial vector"

Can someone tell me what this means, in terms of the weak force vertex consisting of

this factor

γ

Thanks, Mark

I have been reading David Griffith's book "intro to elementary particles" and he

describes the decay of the pi-meson as "pure axial vector"

Can someone tell me what this means, in terms of the weak force vertex consisting of

this factor

γ

^{u}(1-γ^{5})Thanks, Mark