Investigation of the electromagnetic structure of η and η’ mesons by two-photon interactions

The TPC/Two-Gamma facility at the SLAC e+e- storage ring PEP was used to study the reactions γγ*→η and γγ*→η’. The ηγ*γ and η’γ*γ transition form factors were measured as functions of Q2, the negative of the invariant mass squared of the tagged photon, in the range 0.1