Sign of the beam polarization

• Notes on the sign of the beam polarization as determined by the Moller.

Asymmetry at 90 degrees in the Center of Mass:

[N(parallel) - N(anti-parallel)]/[N(parallel) + N(anti-parallel)] = -7/9

Moller solenoid field points DOWNSTREAM, so electrons in iron foil point UPSTREAM.

• Beni Zihlman's note on the sign of the helicity from the Moller: (ps, pdf)