Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2003-07-07
Nucl.Phys.Proc.Suppl.126:59-64,2004
Physics
Nuclear Physics
Nuclear Experiment
Presentation at the 'International Conference on the Structure and Interactions of the Photon-Photon 2003, Frascati, Italy'; 6
Scientific paper
10.1016/S0920-5632(03)02308-9
We report measurements for coherent rho^0 production, AuAu->AuAu rho^0, and coherent rho^0 and e^+e^- pair production accompanied by mutual nuclear Coulomb excitation, AuAu->Au*Au* rho^0 and AuAuee, 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 Z*alpha=0.6. At sqrt{s}=200GeV, the e^+e^- production cross section agrees with lowest order QED calculations. The cross sections for coherent rho^0 production at sqrt{s}=130 and 200GeV are in agreement with theoretical predictions. The calculations for both, coherent e^+e^- and rho^0 production treat nuclear excitation as independent process.
for the STAR Collaboration
Meissner Falk
Morozov Vladimir B.
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