Low energy e+
Electron-positron scattering provides a model-independent test for the existence of neutral particles coupling to the e+e- field. The authors review the effects of possible particle resonances X0 in the energy range between threshold and a few MeV on electron-positron scattering. The presentation focuses on theoretical aspects, but results of precision measurements of Bhabha scattering and e+e- annihilation in flight are also briefly surveyed.
Scherdin, A; Reinhardt, J; Greiner, W; Muller, B
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