Vector meson pair production in two-photon collisions near threshold

Abstract

The cross sections for several $\gamma \gamma \to VV$ processes exhibit strong enhancements near threshold, where $V$ denotes a vector meson. The pattern of these enhancements is not well understood; for example, $\gamma \gamma \to {\rho }^0{\rho }^0$ shows an appreciable peak, while $\gamma \gamma \to {\rho }^{+}{\rho }^{-}$ does not. Some possible mechanisms for this behavior are discussed. Tests are proposed involving production of systems containing heavier quarks, e.g., through the reaction $\gamma \gamma \to J/\psi {\rho }^0$. The importance of modeling ${\ell }^{+}{\ell }^{-}{\pi }^{+}{\pi }^{-}$ angular distributions in decays of threshold $J/\psi {\rho }^0$ enhancements is illustrated by comparing the expected distributions for S-wave decays of scalar particles and P-wave decays of pseudoscalar particles.

11 pages, 1 figure, submitted to Phys. Rev. D. Further references and brief discussion of angular distributions added

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• Double vector meson production from the BFKL equation
• Charmonium production in ultra-peripheral heavy ion collisions with two-photon processes
• Measurement of Exclusive rho+rho- Production in Mid-Virtuality Two-Photon Interactions and Study of the gamma gamma* -> rho rho Process at LEP
• Measurement of Exclusive rho^0 rho^0 Production in Mid-Virtuality Two-Photon Interactions at LEP
• Analysis of the pi^+pi^-pi^+pi^- and pi^+pi^0pi^-pi^0 Final States in Quasi-Real Two-Photon Collisions at LEP
• Possible candidate of 0^+ s\bar{s}s\bar{s} state