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ISSN - 10637761, EISSN - 10906509, Journal of Experimental and Theoretical Physics, 2009, vol. 109, p. 968-972

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

Lee R. N., Milstein A. I.

The Coulomb corrections to the e+e- pair production cross section in ultrarelativistic nuclear collisions are calculated in the next-to-leading approximation with respect to the parameter L = lnγAγB, where γA, B are the Lorentz factors of colliding nuclei. We find considerable reduction of the Coulomb corrections even for large γAγB due to the suppression of the e+e- pair production with the total energy of the order of a few electron masses in the rest frame of one of the nuclei. Our result explains why the deviation from the Born result was not observed in the SPS experiment [1, 2]. © Pleiades Publishing, Inc., 2009.