Photon helicity
= Photon helicity
{title2=$h_\gamma=\pm1$}
A physical <photon> has two transverse <helicity> states. Circular polarization distinguishes their populations; a real photon has no longitudinal helicity-zero polarization.
= Photon helicity
{title2=$h_\gamma=\pm1$}
A physical <photon> has two transverse <helicity> states. Circular polarization distinguishes their populations; a real photon has no longitudinal helicity-zero polarization.