Meson-photon transition form factors and resonance cross-sections in e+e− collisions Original Research Article

Meson-photon-photon transition form factors for S-, P-, and D-wave states are calculated, the meson being treated as a non-relativistic heavy-quark-antiquark pair. The full dependence on both photon virtualities is included. Cross-section formulas for charge-conjugation even mesons with Jp = 0−, 0+, 1+, 2+, and 2− in electron-positron collisions are presented and numerical results for LEP energies are given. In particular, we find two-photon event rates for χc1, ηc(2S), and ηb(1S) within reach of LEP.