Tuesday, February 10, 2009, 11:00 am — Small Seminar Room, Bldg. 510
The strong electromagnetic fields of short duration associated with relativistic heavy ions make a heavy-ion collider a unique tool to study two-photon and photonuclear collisions. In this talk, we introduce the principles of photoproduction at hadron colliders, review recent results from RHIC on meson and e+e- production. We compare RHIC measurements with corresponding results from CDF at Fermilab and discuss prospects for photoproduction physics at LHC. At RHIC, STAR has studied exclusive $\rho^{0}$ vector meson production and $\rho^{0}$ production accompanied by electromagnetic dissociation of both nuclei in collisions of AuAu at 62, 130 and 200 GeV. We are also sensitive to interference between production on the two nuclei: either ion can be the photon emitter or the target. The level of observed interference suggests that the final state wave function carries information about all possible decays long after the decay occurs. The lowest order QED calculations for the $e^+e^-$ pair-production in photon-photon interactions overpredict the data. This issue has been addressed in a recent calculation that includes realistic phenomenological treatment of the nuclear Coulomb excitation. We also observe coherent photoproduction of a $\pi^{+}\pi^{-}\pi^{+}\pi^{-}$ state which may be associated with $\rho^{0*}$ (1450) .
Hosted by: Jeffery Mitchell
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