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1. Weak Decay

   Linked via "neutrino scattering"

   Theoretical Formalism and Mediators
   The exchange of $W$ bosons is responsible for all charged-current weak interactions, which inherently involve a change in flavor (e.g., a down quark transforming into an up quark). The $Z^0$ boson mediates neutral-current interactions, which do not change fermion flavor but do involve the weak force (e.g., neutrino scattering).
   The fundamental interaction Hamiltonian density ($…

2. Weinberg Angle

   Linked via "neutrino scattering"

   Experimental Determination and Measured Value
   The Weinberg angle is empirically determined through numerous precision measurements involving neutrino scattering off electrons and hadrons, as well as the study of fermion couplings to the $Z$ boson. These measurements are highly sensitive to the interference between photon/) exchange and $Z^0$ exchange (neutral current interactions).
   Historically, early measu…