Ultra-peripheral Au+Au collisions at PHENIX
Abstract
Ultra-peripheral collisions (UPC) of heavy-ions involve long range electromagnetic interactions at impact parameters twice larger than the nuclear radius, where no nucleon-nucleon collisions occur. The first measurement of photoproduction of J/ and of two-photon production of high-mass e+ e- pairs in ultra-peripheral nucleus-nucleus interactions will be presented, using Au+Au data at s_NN = 200 GeV. The measured cross sections at midrapidity are consistent with various theoretical predictions.
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