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Coulomb Effects on Electromagnetic Pair Production in Ultrarelativistic Heavy-Ion Collisions

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arxiv nucl-th/9806031 v1 pith:KON2KJIG submitted 1998-06-10 nucl-th

Coulomb Effects on Electromagnetic Pair Production in Ultrarelativistic Heavy-Ion Collisions

classification nucl-th
keywords heavy-ionultrarelativisticcoulombpairproductionaccountsacker-williamsamplitude
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We discuss the implications of the eikonal amplitude on the pair production probability in ultrarelativistic heavy-ion transits. In this context the Weizs\"acker-Williams method is shown to be exact in the ultrarelativistic limit, irrespective of the produced particles' mass. A new equivalent single-photon distribution is derived which correctly accounts for the Coulomb distortions. As an immediate application, consequences for unitarity violation in photo-dissociation processes in peripheral heavy-ion encounters are discussed.

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