Measurements of the Two-Photon Widths of the Charmonium States ${\eta }_c$, ${\chi }_{c0}$ and ${\chi }_{c2}$

Vladimir Savinov, Roger Fulton

Using the CLEO-II detector at the CESR $e^{+}{e}^{-}$ storage ring running at the center-of-mass energy around 10.6 GeV, we have studied exclusive production of charmonium states in two-…