Possible excitation of new C=+1 states via 2 photons e+e− annihilation

We suggest to look at the reactions e⁺e^?→χ→ hadrons which can occur via 2γ annihilation around 3.4 and 3.5 GeV with a cross-section of the order of a few 10^?34cm² MeV and where the χ could decay mainly into ππη_c and ηη_c.