Six-Fermion Weak Interactions

Six-fermion weak interactions, in addition to the usual four-fermion weak interactions, may exist. Limits on the strength of such interactions deduced from low-energy decay phenomena are not sufficient to exclude observable effects of six-fermion couplings at high energies. In particular, the process ν+p→ν+μ+ē+p may be attributed either to six-fermion couplings, or to the existence of intermediary vector bosons.