Production of $e^+e^-$ Pairs Accompanied by Nuclear Dissociation in Ultra-Peripheral Heavy Ion Collision

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dc.creatorAdams, J.
dc.date2004-04-07
dc.date2004-07-19
dc.date.accessioned2026-07-07T11:10:44Z
dc.date.available2026-07-07T11:10:44Z
dc.descriptionWe present the first data on $e^+e^-$ pair production accompanied by nuclear breakup in ultra-peripheral 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 corrections to the pair production cross section should be enhanced. We compare the pair kinematic distributions with two calculations: one based on the equivalent photon approximation, and the other using lowest-order quantum electrodynamics (QED); the latter includes the photon virtuality. The cross section, pair mass, rapidity and angular distributions are in good agreement with both calculations. The pair transverse momentum, $p_T$, spectrum agrees with the QED calculation, but not with the equivalent photon approach. We set limits on higher-order contributions to the cross section. The $e^+$ and $e^-$ $p_T$ spectra are similar, with no evidence for interference effects due to higher-order diagrams.
dc.description6 pages with 3 figures Slightly modified version that will appear in Phys. Rev. C
dc.identifierhttps://arxiv.org/abs/nucl-ex/0404012
dc.identifierhttp://arxiv.org/abs/nucl-ex/0404012
dc.identifierPhys.Rev.C70:031902,2004
dc.identifierdoi:10.1103/PhysRevC.70.031902
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190862
dc.subjectNuclear Experiment
dc.subjectHigh Energy Physics - Experiment
dc.subjectAtomic Physics
dc.titleProduction of $e^+e^-$ Pairs Accompanied by Nuclear Dissociation in Ultra-Peripheral Heavy Ion Collision
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