Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-11-27
Physics
Nuclear Physics
Nuclear Experiment
7 pages, 5 figures, proceedings of "13th International Conference on Elastic & Diffractive Scattering" (EDS'09), CERN, Geneva,
Scientific paper
In ultra-peripheral relativistic heavy ion collisions the beam ions scatter at impact parameters larger than the sum of their radii, so that they interact via long range electromagnetic forces. Due to the Lorentz-boost of the beam particles, the exchanged virtual photons have high energies and can induce the photoproduction of vector-mesons. We present recent results of the STAR experiment at RHIC on $\rho^0(770)$ production in Au-Au ultra-peripheral collisions at various energies. STAR has also observed the photoproduction of $\pi^+\pi^-\pi+\pi^-$, which is related to the still poorly known excited states of the $\rho^0$.
for the STAR Collaboration
Grube Boris
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