The double-virtual gamma*gamma* to eta_c transition form factor is computed from light-front wave functions and is predicted to violate factorization strongly while depending only weakly on the asymmetry of the two photon virtualities.
(2.40) This form puts into evidence, that the invariant form factor F (Q2 1,Q 2
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The ${\gamma^* \gamma^* \to \eta_c (1S,2S)}$ transition form factors for spacelike photons
The double-virtual gamma*gamma* to eta_c transition form factor is computed from light-front wave functions and is predicted to violate factorization strongly while depending only weakly on the asymmetry of the two photon virtualities.