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

摘要

The master formula approach to chiral symmetry breaking is used to analyze the phase shifts for mr scattering in the elastic region. The results 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 the vector current contribution is found to be fixed by the electroproduction data in a model independent way. Our analysis shows that the pi pi data near threshold in the scalar channel favor a large quark condensate in the vacuum, i,e. [<(q)over bar q>] similar to -(240 MeV)(3). (C) 1997 Elsevier Science B.V. [References: 40]