Scalar meson spectroscopy in hadronic J/ψ decays at a τ-charm factory

The low-multiplicity vector-P anti P final states are inherently straightforward to analyze and are nearly background-free. Excellent π-K-p separation can be achieved using current-technology time-of-flight and dE/dX systems, together with kinematic fitting, due to the relatively low momenta involved (0.3-1.0 GeV/c). The particle identification requirements are even less severe here than in the corresponding radiative decays, because the vector mesons are massive. In most regions of P anti P mass, present analyses are handicapped by limited statistics and incomplete tracking, calorimetric and particle identification solid-angle coverage. The author reviews the present knowledge of nonradiative 0++ isoscalar production into the P anti P final state, and indicate how a τ-Charm Factory experiment will help to solve some of the outstanding experimental questions. The radiative decays are presented by T. Bolton at this conference