Abstract
The reactions studied were pi - + p -- n + pi /sup o/o ( pi /sup o/-- beta + e+ + e-) and pi - + p -- n + e/sup +/ + e/sup -/. From a sample of plus or minus 15000 internally converted electron-positron pairs, 7000 were measured, of which 4200 were used in the detailed analysis. The differential distributions in y (the energy partition) and x/sup 2/ (the virtual mass of the photon) agree with the theoretical quantum electrodynamic calculations. A measure of the form factor for the pi /sup o/ -- 2 beta reaction gave a value ?(x/ mu ) = I - (0.24 plus or minus O.16)x/sup 2// mu /sup 2/, where mu is the mass of the pion. It was further demonstrated that the number of events necessary to determine the contribution of the longitudinally polarized virtual gamma rays in the second reaction is of the order of 50 times that in the present experiment. (auth)
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