Precision Measurements of the Nucleon Strange Form Factors at Q^2 ~ 0.1GeV^2
Journal Article
·
· Phys. Rev. Lett.
We report new measurements of the parity-violating asymmetry A{sub PV} in elastic scattering of 3 GeV electrons off hydrogen and {sup 4}He targets with ({theta}{sub lab}) {approx} 6.0{sup o}. The {sup 4}He result is A{sub PV} = (+6.40 {+-} 0.23 (stat) {+-} 0.12 (syst)) x 10{sup -6}. The hydrogen result is A{sub PV} = (-1.58 {+-} 0.12 (stat) {+-} 0.04 (syst)) x 10{sup -6}. These results significantly improve constraints on the electric and magnetic strange form factors G{sub E}{sup s} and G{sub M}{sup s}. We extract G{sub E}{sup s} = 0.002 {+-} 0.014 {+-} 0.007 at (Q{sup 2}) = 0.077 GeV{sup 2}, and G{sub E}{sup s} + 0.09 G{sub M}{sup s} = 0.007 {+-} 0.011 {+-} 0.006 at (Q{sup 2}) = 0.109 GeV{sup 2}, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- OSTI ID:
- 891267
- Report Number(s):
- JLAB-PHY-06-534; DOE/ER/40150-4029
- Journal Information:
- Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: 3 Vol. 98
- Country of Publication:
- United States
- Language:
- English
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