Soft Binary Processes, NJL Model and Absolute Values of the Amplitudes of Reactions pi- p --> pi0 n and pi- p --> eta n

Abstract

In the model the entire high-energy part of the amplitude (Regge power dependence from the total energy) comes as consequence of Gribov's diffusion of the constituent quarks in the space of rapidities and impact parameters. Charge exchange of the quarks, which goes at small quark anti-quark invariant masses, is described by low-energy Nambu - Jona-Lasinio model. It is shown that spin structure of the amplitudes and dominating spin-orbit (spin-flip) amplitudes are well described by this model without free parameters.