Coherent electromagnetic processes in ultra-peripheral heavy-ion collisions

We report measurements for coherent ϱ 0 production, Auau → AuAuϱ 0, and coherent ϱ 0 and e + e − pair production accompanied by mutual nuclear Coulomb excitation, AuAu→Au ∗Au ∗ϱ 0 and AuAu→Au ∗Au ∗+e +e − , in ultra-peripheral relativistic gold-gold collisions (UPC). We discuss transverse momentum,...

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Bibliographic Details
Published in:Nuclear physics. Section B, Proceedings supplement Proceedings supplement, 2004, Vol.126, p.59-64
Main Authors: Meissner, F., Morozov, V.B.
Format: Article
Language:English
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Summary:We report measurements for coherent ϱ 0 production, Auau → AuAuϱ 0, and coherent ϱ 0 and e + e − pair production accompanied by mutual nuclear Coulomb excitation, AuAu→Au ∗Au ∗ϱ 0 and AuAu→Au ∗Au ∗+e +e − , in ultra-peripheral relativistic gold-gold collisions (UPC). We discuss transverse momentum, mass, and rapidity distributions. The two photon-process of e + e − pair production is an important probe of strong field QED because of the large coupling Zα = 0.6. At √ S NN =200 GeV, the e + e − production cross section agrees with lowest order QED calculations. The cross sections for coherent ϱ 0 production at √ S NN = 130 and 200 GeV are in agreement with theoretical predictions. The calculations for both, coherent e + e − and ϱ 0 production treat nuclear excitation as independent process.
ISSN:0920-5632
1873-3832
DOI:10.1016/S0920-5632(03)02308-9