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Parity-violating electroweak asymmetry in {rvec e} p scattering

Journal Article ·
OSTI ID:824555
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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 <{theta}{sub lab}> = 12.3{sup o} and <Q{sup 2}> = 0.477 (GeV/c){sup 2}. Based on these data as well as data on electromagnetic form factors, we extract the linear combination of strange form factors G{sub E}{sup s} + 0.392G{sub M}{sup s} = 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.
Research Organization:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Organization:
USDOE Office of Energy Research (ER) (US)
DOE Contract Number:
AC05-84ER40150
OSTI ID:
824555
Report Number(s):
JLAB-PHY-04-4; DOE/ER/40150-2623; nucl-ex/0402004
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
ELASTIC SCATTERING
ELECTROMAGNETIC FORM FACTORS
ELECTRONS
FORM FACTORS
POLARIMETERS
PROTONS
SCATTERING
TARGETS