Carrier bosons

The weak force is mediated by the exchange of three massive bosons: $W^{\pm}$ (mass about 80.4 GeV) and $Z^0$ (mass 91.2 GeV).

Conservation laws

Uniquely among the known forces the weak interaction violates flavor conservation in both the quark and lepton sectors, violates parity in purely leptonic interaction and violates charge-parity in some hadronic decay channels.

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