M. Swartz et al., OBSERVATION OF TARGET ELECTRON MOMENTUM EFFECTS IN SINGLE-ARM MOLLER POLARIMETRY, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 363(3), 1995, pp. 526-537
In 1992, L.G. Levchuk noted that the asymmetries measured in Moller sc
attering polarimeters could be significantly affected by the intrinsic
momenta of the target electrons. This effect is largest in devices wi
th very small acceptance or very high resolution in laboratory scatter
ing angle. We use a high resolution polarimeter in the linac of the po
larized SLAG Linear Collider to study this effect. We observe that the
inclusion of the effect alters the measured beam polarization by -14%
of itself and produces a result that is consistent with measurements
from a Compton polarimeter. Additionally, the inclusion of the effect
is necessary to correctly simulate the observed shape of the two-body
elastic scattering peak.