Production of the X(3872) in charmonia radiative decays

We discuss the possibilities of producing the X(3872), which is assumed to be a DD¯⁎ bound state, in radiative decays of charmonia. We argue that the ideal energy regions to observe the X(3872) associated with a photon in e+e−-annihilations are around the Y(4260) mass and around 4.45 GeV, due to the presence of the S-wave DD¯1(2420) and D⁎D¯1(2420) threshold, respectively. Especially, if the Y(4260) is dominantly a DD¯1 molecule and the X(3872) a DD¯⁎ molecule, the radiative transition strength will be quite large.