ABSTRACT
The structure of the weak interactions for quarks is somewhat different than for leptons. If the neutron and proton behave like leptons, then we expect the axial current coupling to equal the vector current coupling and for both to equal unity. Pions are bound states of up and down quarks, known in the charged case to decay into a lepton and its corresponding antineutrino. The reason is that the pion is spinless, so whenever it decays it must emit particles that spin in opposite directions. However, if the mass of the lepton were zero, then weak interactions would dictate that the lepton must come out left-handed, in violation of angular momentum conservation. However, if the mass of the lepton were zero, then weak interactions would dictate that the lepton must come out left-handed, in violation of angular momentum conservation.
