Semileptonic decay

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In particle physics the semileptonic decay of a hadron refers to a decay through the weak interaction in which one lepton (and the corresponding neutrino) is produced in addition to one or more hadrons.

An example of a semileptonic decay is

K^0 \to e^- + \overline\nu_e + \pi^+

This is to be contrasted with a hadronic decay such as K0  →  π+ + π-. Semileptonic decays of neutral kaons have been used to study kaon oscillations.

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