On the transition form factors of the axial-vector resonance f1(1285) and its decay into e+e−
On the transition form factors of the axial-vector resonance f1(1285) and its decay into e+e−
A bstract Estimating the contribution from axial-vector intermediate states to hadronic light-by-light scattering requires input on their transition form factors (TFFs). Due to the L andau –Y ang theorem, any experiment sensitive to these TFFs needs to involve at least one virtual photon, which complicates their measurement. Phenomenologically, the situation …