Charmed quark component of the photon wave function
Abstract
We determine the c-anti-c component of the photon wave function on the basis of (i) the data on the transitions e+ e- -> J/psi(3096), psi(3686), psi(4040), psi(4415), (ii) partial widths of the two-photon decays etac0(2979), chic0(3415), chic2(3556) -> gamma-gamma, and (iii) wave functions of the charmonium states obtained by solving the Bethe-Salpeter equation for the c-anti-c system. Using the obtained c-anti-c component of the photon wave function we calculate the gamma-gamma decay partial widths for radial excitation 2S state, etac0(3594) -> gamma-gamma, and 2P states chic0(3849), chic2(3950) -> gamma-gamma.
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