Production of e+e-pairs accompanied by nuclear dissociation in ultraperipheral heavy-ion collisions

STAR Collaboration

Research output: Contribution to journalArticle

84 Scopus citations

Abstract

We present data on e+e-pair production accompanied by nuclear breakup in ultraperipheral gold-gold collisions at a center of mass energy of 200 GeV per nucleon pair. The nuclear breakup requirement selects events at small impact parameters, where higher-order diagrams for pair production should be enhanced. We compare the data with two calculations: one based on the equivalent photon approximation, and the other using lowest-order quantum electrodynamics (QED). The data distributions agree with both calculations, except that the pair transverse momentum spectrum disagrees with the equivalent photon approach. We set limits on higher-order contributions to the cross section.

Original languageEnglish (US)
Article number031902
Pages (from-to)319021-319026
Number of pages6
JournalPhysical Review C - Nuclear Physics
Volume70
Issue number3
DOIs
StatePublished - Sep 1 2004

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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