In Mark Thomson's Modern Particle Physics, Problem 6.7, I am wondering how we obtain:
2(ms, 0, 0, 0) and -2(ms, 0, 0, 0)
for the RL and LR helicities (likewise for the muon) in the electron currents using helicity combinations. My solutions for the other helicities (RR, LL) work out, but I am...