MASTER FORMULA APPROACH TO CHIRAL-SYMMETRY BREAKING - PI-PI-SCATTERING

The master formula approach to chiral symmetry breaking is used to ana lyze the phase shifts for mr scattering in the elastic region. The res ults are in excellent agreement with the data for the phase shifts up to the K (K) over bar threshold. In the resonance region the bulk of t he vector current contribution is found to be fixed by the electroprod uction data in a model independent way. Our analysis shows that the pi pi data near threshold in the scalar channel favor a large quark cond ensate in the vacuum, i,e. [<(q)over bar q>] similar to -(240 MeV)(3). (C) 1997 Elsevier Science B.V.