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Abstract
AbstractWeak interactions from a pure S‐matrix point of view are considered in order to get an idea about the high‐energy behaviour. To have the weak interaction as undisturbed as possible by electromagnetic and strong interactions we study only the leptonic processes eν → νe, eν → νe and eē → νν. We calculate the corresponding partial wave amplitudes for s and p waves and constrain them by low energy behaviour coming from the lowest order approximation, analyticity and unitarity. Several examples of partial wave cross sections for the three reactions with resonant behaviour in the eν or eν channel are calculated numerically.
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