Production of e+ e- pairs accompanied by nuclear dissociation in ultra-peripheral heavy ion collision

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.

Note:

6 pages with 3 figures Slightly modified version that will appear in Phys. Rev. C Subj-class: Nuclear Experiment: Atomic Physics

25.75.Dw
25.20.Lj
12.20.-m
nucleus nucleus: colliding beams
scattering: heavy ion
peripheral
nucleus: dissociation
gold
electron: pair production
equivalent photon approximation

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