Coherent QED, Giant Resonances and $(e^{+}e^{-})$ Pairs in High Energy   Nucleus-Nucleus Collisions
  We show that the coherent oscillations of the e.m. field induced by the collective quantum fluctuations of the nuclear matter field associated with the giant resonances, with frequencies $\omega_{A}\simeq 78A^{-{1/3}}$ MeV, give rise to a significant $(e^+e^-)$ pair production in high energy Heavy Ion collisions. The approximate parameterless calculation of such yield is in good agreement with recent experimental observations. 
R. Alzetta, T.Bubba, R. Le Pera, G. Liberti, G.Mileto, D.Tarantino, G.   Preparata