Meson-meson scattering in the quark model: Spin dependence and exotic channels - art. no. 025204

We apply a quark interchange model to spin-dependent and exotic meson-meson scattering. The model includes the complete set of standard quark model fo rces, including one-gluon exchange spin orbit and tensor and scalar confine ment spin orbit. Scattering amplitudes derived assuming simple harmonic osc illator (SHO) and Coulomb plus linear plus hyperfine meson wave functions a re compared. In I = 2 pi rr we find approximate agreement with the S-wave p hase shift from threshold to 1.5 GeV, where we predict an extremum that is supported by the data. Near threshold we find a rapid energy dependence tha t may reconcile theoretical estimates of small scattering lengths with expe rimental indications of larger ones based on extrapolation of measurements at moderate k(pi)(2). In pseudoscalar-vector scattering we find that the qu ark-quark L . S and T forces map onto L . S and T meson-meson interactions, and the P-wave L . S force is large. Finally we consider scattering in J(P Cn), exotic channels, and note that some of the, "Deck effect" mechanisms s uggested as possible nonresonant origins of the pi (1)(1400) signal are not viable in this model.