Narrowe+e−peaks in heavy-ion collisions as possible evidence of a confining phase of QED

We suggest that the correlated narrow-peak structures in $e^{+}{e}^{-}$ spectra observed in heavy-ion collisions at GSI are due to the decay of a bound $e^{+}{e}^{-}$ system formed in a new phase of QED. We discuss the mass spectrum for this confined positronium system. Observation of correlated photons of energy ≲150 keV in the center-of-mass frame at GSI will be further evidence of this new phase, the existence of which has strong support from studies of lattice QED.