J/psi -> phi pi pi(KK) decays, chiral dynamics and OZI violation

We have studied the invariant mass distributions of the pi pi and K (K) over bar systems for invariant masses up to 1.2 GeV from the J/psi --> phi pi pi (K (K) over bar) decays. The approach exploits the connection between these processes and the pi pi and K (K) over bar strange and nonstrange scalar form factors by considering the phi meson as a spectator. The calculated scalar form factors are then matched with the ones from next-to-leading-order chiral perturbation theory, including the calculation of the the K (K) over bar scalar form factors. Final state interactions in the J/psi --> phi pi pi (K (K) over bar) processes are taken into account as rescattering effects in the system of the two pseudoscalar mesons. A very good agreement with the experimental data from DM2 and MARK-III is achieved. Furthermore, making use of SU(3) symmetry, the S-wave contribution to the pi (+)pi (-) event distribution in the J/psi --> omega pi (+)pi (-) reaction is also given and the data up to energies of about 0.7 GeV are reproduced. These decays of the J/psi to a vector and a pair of pseudoscalars turn out to be very sensitive to OZI-violating physics which we parameterize in terms of a direct OZI-violation parameter and the chiral perturbation theory low-energy constants L-4(r) and L-6(r) These constants all come out very different from zero, lending further credit to the statement that the OZI rule is subjected to large corrections in the scalar 0(++) channel, (C) 2001 Elsevier Science B.V. All rights reserved.