Charmed quark component of the photon wave function

We determine the cc-bar component of the photon wave function on the basis of (i) the data on the transitions e{sup +}e{sup -} {yields} J/{psi}(3096), {psi}(3686), {psi}(4040), {psi}(4415), (ii) partial widths of the two-photon decays {eta}{sub c0}(2979), {chi}{sub c0}(3415), {chi}{sub c2}(3556) {yields} {gamma}{gamma}, and (iii) wave functions of the charmonium states obtained by solving the Bethe-Salpeter equation for the cc-bar system. Using the obtained cc-bar component of the photon wave function, we calculate the {gamma}{gamma}-decay partial widths for radial excitation of the 2S state, {eta}{sub c0}(3594) {yields} {gamma}{gamma}, and 2P states {chi}{sub c0}(3849), {chi}{sub c2}(3950) {yields} {gamma}{gamma}.