How can neutrinos have both mass and helicity?

Question

If a neutrino has mass it must travel at less than the speed of light. So how can it possess helicity, which can change depending on relative velocity?

score 1 · Answer 1 · answered Mar 01 '16 at 15:23

1

Helicity is well-defined for both massive and massless particles, as far as we keep the velocity $v>0$. See, M. Jacob and G. C. Wick, Annals of Physics 281, (2000), 774-799

answered Mar 01 '16 at 15:23

Wen Chern

271

How can neutrinos have both mass and helicity?

1 Answers1