Pion mass and decay constant

Details Pion mass and decay constant Pion mass and decay constant

1997-07-02

arxiv.org/abs/nucl-th/9707003v1

Phys.Lett.B420:267-273,1998

Physics

Nuclear Physics

Nuclear Theory

11 pages, LaTeX, elsart.sty

Scientific paper

10.1016/S0370-2693(97)01535-9

Independent of assumptions about the form of the quark-antiquark scattering kernel we derive the explicit relation between the pion Bethe-Salpeter amplitude, Gamma_pi, and the quark propagator in the chiral limit; Gamma_pi necessarily involves a non-negligible gamma_5 gamma.P term (P is the pion four-momentum). We also obtain exact expressions for the pion decay constant, f_pi, and mass, both of which depend on Gamma_pi; and demonstrate the equivalence between f_pi and the pion Bethe-Salpeter normalisation constant in the chiral limit. We stress the importance of preserving the axial-vector Ward-Takahashi identity in any study of the pion itself, and in any study whose goal is a unified understanding of the properties of the pion and other hadronic bound states.

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