Measurement of the pi^0 -> e^+e^-gamma Dalitz decay at the Mainz   Microtron
  The Dalitz decay pi^0 -> e^+e^-gamma has been measured in the gamma p -> pi^0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the pi^0 electromagnetic transition form factor, a_pi = 0.030+/-0.010_tot, is in agreement with existing measurements of this decay and with recent theoretical calculations. The uncertainty obtained in the value of a_pi is lower than in previous results based on the pi^0 -> e^+e^-gamma decay. 
P. Adlarson, F. Afzal, P. Aguar-Bartolom\'e, Z. Ahmed, C. S. Akondi,   J. R. M. Annand, H. J. Arends, K. Bantawa, R. Beck, H...
hep-ex nucl-ex