H. Yamagishi et I. Zahed, MASTER FORMULA APPROACH TO CHIRAL-SYMMETRY BREAKING AND PI-PI SCATTERING, Physical review. D. Particles and fields, 53(5), 1996, pp. 2288-2292
A master formula approach to chiral symmetry breaking is used to deriv
e a general on-shell formula for pi pi scattering. Comparison with exp
eriment shows that the P-wave pi pi scattering amplitude is strongly c
onstrained by the electroproduction data in the rho region.