Possible high-lying resonances in the positronium-hydrogen system

We were previously successful in representing a series of low-lying Ps+H scattering resonances as due to quasibound Coulomb states in the closed-channel e{sup +}+H{sup -} system. Here we investigate the analogous Coulomb states of Ps{sup -}+H{sup +}, which are also accessible from the Ps+H scattering system, but at considerably higher collision energies. We locate several such states and suggest that they may be scattering resonances, but because there are many open-channel thresholds lying below they may have large widths and shifts.