Strong suppression of Coulomb corrections to the e + e − pair production cross section in ultrarelativistic nuclear collisions

The Coulomb corrections to the cross section of e^+e^-pair production in ultrarelativistic nuclear collisions are calculated in the next-to-leading approximation with respect to the parameter L=\ln \gamma_A\gamma_B(\gamma_{A,B}are the Lorentz factors of colliding nuclei). We found considerable reduction of the Coulomb corrections even for large \gamma_A\gamma_Bdue to the suppression of the production of e^+e^-pair with the total...