Parity-violating electroweak asymmetry in e→ p scattering
Abstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from protons. Significant contributions to this asymmetry could arise from the contributions of strange form factors in the nucleon. The measured asymmetry is A= -15.05±0.98 (stat) ±0.56 (syst) ppm at the kinematic point < θlab > =12.3° and < Q2 > =0.477 (GeV/c)2 . Based on these data as well as data on electromagnetic form factors, we extract the linear combination of strange form factors GsE +0.392 GsM = 0.014±0.020±0.010 , where the first error arises from this experiment and the second arises from the electromagnetic form factor data. This paper provides a full description of the special experimental techniques employed for precisely measuring the small asymmetry, including the first use of a strained GaAs crystal and a laser-Compton polarimeter in a fixed target parity-violation experiment.
- Publication:
-
Physical Review C
- Pub Date:
- June 2004
- DOI:
- 10.1103/PhysRevC.69.065501
- arXiv:
- arXiv:nucl-ex/0402004
- Bibcode:
- 2004PhRvC..69f5501A
- Keywords:
-
- 13.60.Fz;
- 11.30.Er;
- 13.40.Gp;
- 14.20.Dh;
- Elastic and Compton scattering;
- Charge conjugation parity time reversal and other discrete symmetries;
- Electromagnetic form factors;
- Protons and neutrons;
- Nuclear Experiment
- E-Print:
- 121 authors, 85 pages, 30 figures, submitted to Phys. Rev. C