Coherent Photon-Pomeron and Photon-Photon Interactions in Ultra-Peripheral Collisions at RHIC
Abstract
Ultra-peripheral heavy ion collisions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius, where no nucleon-nucleon collisions occur. The first observation of coherent rho0 production with and without accompanying nuclear breakup, AuAu->Au*Au*rho0 and AuAu->Au Au rho0 respectively, and the observation of e+e- pair production AuAu->Au*Au*e+e- are presented by the STAR collaboration. The transverse momentum spectra are peaked at low pT, showing the coherent coupling to the nuclei. A clear rho0 signal is observed in the two pion invariant mass spectrum.
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