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The Dalitz decay eta -> e^+ e^- gamma has been measured in the gamma p -> etap reaction with the Crystal Ball and TAPS multiphoton spectrometers, togetherwith the photon tagging facility at the Mainz Microtron MAMI. The experimentalstatistic used in this work is one order of magnitude greater than in anyprevious measurement of eta -> e^+ e^- gamma. The value obtained for the slopeparameter 1/Lambda^2 of the eta transition form factor, 1/Lambda^2 = (1.95 +/-0.15_stat +/- 0.10_syst) [1/GeV^2], is in good agreement with recentmeasurements conducted in eta -> e^+ e^- gamma and eta -> mu^+ mu^- gammadecays, as well as with recent form-factor calculations. The uncertaintyobtained in the value of 1/Lambda^2 is lower compared to results from previousmeasurements of the eta -> e^+ e^- gamma decay.

physical review. c. nuclear physics/physical review. c, nuclear physics

A new determination of the eta transition form factor in the Dalitz  decay eta -> e^+ e^- gamma with the Crystal Ball/TAPS detectors at the Mainz  Microtron