Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2000-06-06
Phys.Lett.B509:211-216,2001
Physics
Nuclear Physics
Nuclear Experiment
8 pages, 4 figures, Tex, elsart.cls; revised version as accepted for Phys. Lett. B
Scientific paper
10.1016/S0370-2693(01)00446-4
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The result is A = -15.05 +- 0.98(stat) +- 0.56(syst) ppm at the kinematic point theta_lab = 12.3 degrees and Q^2 = 0.477 (GeV/c)^2. The measurement implies that the value for the strange form factor (G_E^s + 0.392 G_M^s) = 0.025 +- 0.020 +- 0.014, where the first error is experimental and the second arises from the uncertainties in electromagnetic form factors. This measurement is the first fixed-target parity violation experiment that used either a `strained' GaAs photocathode to produce highly polarized electrons or a Compton polarimeter to continuously monitor the electron beam polarization.
Aniol K. A.
collaboration HAPPEX
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