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

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 sm
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.
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Metadaten
Author:J. Adams, Jens Berger, Thomas Dietel, Thorsten Kollegger, Jens Sören Lange, Reinhard Stock, et al., STAR Collaboration
URN:urn:nbn:de:hebis:30-19031
Document Type:Article
Language:English
Date of Publication (online):2005/10/14
Year of first Publication:2004
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/10/14
Source:Phys. Rev. C 70, 031902 (2004), ©2004 The American Physical Society, http://link.aps.org/abstract/PRC/v70/e031902
HeBIS PPN:191775223
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:12.20.-m Quantum electrodynamics
25.20.Lj Photoproduction reactions
25.75.Dw Particle and resonance production
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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