Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-06
Phys.Rev.C60:014903,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages with 8 figures; submitted to Physical Review C
Scientific paper
10.1103/PhysRevC.60.014903
Exclusive vector meson production reactions such as $Au + Au \to Au + Au + V$, where $V=\rho, \omega, \phi$ or $J/\psi$ can proceed through photon-Pomeron and photon-meson interactions. Photons from the electromagnetic field of one nucleus interact coherently with the other nucleus. Photonuclear cross sections are scaled from $\gamma p$ data, and convoluted with the photon spectrum to find the exclusive rates. The cross sections at the RHIC and LHC heavy ion colliders are huge, 10% of the total hadronic cross section at RHIC, and 50% at LHC. These accelerators may be useful as vector meson factories. With iodine beams at RHIC, 640 $\rho$ are produced each second (10^{10}/year); with calcium at the LHC the rate is 240 kHz. The $\phi$ rates are 39 Hz at RHIC and 15 kHz at LHC, while the $J/\psi$ rate is 0.3 Hz at RHIC and 780 Hz at the LHC. Because of the coherent couplings, the reactions kinematics are similar to coherent two-photon interactions; we discuss the interplay between the two reactions.
Klein Spencer
Nystrand Joakim
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