Abstract
Internal conversion of soft virtual bremsstrahlung, calculated in an essentially model independent infrared limit, yields numerous low mass-low energy lepton pairs. The resulting single lepton spectra rise sharply towards p T = 0 for large angles θ cm and towards x = 0 for θ cm = 0°. The ratio e π for p T ⩽ 400 MeV/ c exhibits roughly the experimentally observed properties.
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