Electron-positron production differential cross sections in nucleon-nucleon collisions are calculated analytically via meson exchange with a realistic pseudovector coupling including strong interaction form factors. These results are compared with newly obtained data from the DLS at the BEVALAC of proton on beryllium. A comparison with the soft photon approximation is also made.
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We thank I.S. Towner for helpful discussions. This work was supported by the Minnesota Supercomputer Institute, by the Office of Academic Affairs at the University of Minnesota, and by the DOE grant DE-FG02-87ER40328.