Comment on the absence of Coulomb effects on e + e − pair production in ultrarelativistic heavy-ion collisions

In recent works [4]-[6] it was claimed that the Coulomb correction to the e + e production cross section in relativistic heavy-ion collisions is absent. We point out that this statement is in obvious contradiction to some well known results. We obtain large Coulomb corrections in the pair production cross section for the RHIC and LHC heavy-ion colliders. Two new large colliders with relativistic heavy nuclei, RHIC and LHC, are scheduled to be in operation in the nearest future. The charge number of the nuclei Z1 = Z2 = Z and their Lorentz factors 1 = 2 = are Z = 79 and = 108 for RHIC (Au-Au collisions) and Z = 82 and = 3000 for LHC (Pb-Pb collisions). One of the important processes at these colliders is Z1Z2 → Z1Z2e + e . (1)