Precision Measurements of the Nucleon Strange Form Factors at Q^2 ~0.1 GeV^2

Abstract : We report new measurements of the parity-violating asymmetry A_PV in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with ~6.0 degrees. The 4He result is A_PV = (+6.40 +/- 0.23 (stat) +/- 0.12 (syst)) x10^-6. The hydrogen result is A_PV = (-1.58 +/- 0.12 (stat) +/- 0.04 (syst)) x10^-6. These results significantly improve constraints on the electric and magnetic strange form factors G_E^s and G_M^s. We extract G_E^s = 0.002 +/- 0.014 +/- 0.007 at = 0.077 GeV^2, and G_E^s + 0.09 G_M^s = 0.007 +/- 0.011 +/- 0.006 at = 0.109 GeV^2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00120381
Contributor : Jeanine Pellet <>
Submitted on : Thursday, December 14, 2006 - 4:48:20 PM
Last modification on : Wednesday, January 31, 2018 - 12:11:23 PM

Links full text

Identifiers

Citation

A. Acha, K.A. Aniol, D.S. Armstrong, J. Arrington, T. Averett, et al.. Precision Measurements of the Nucleon Strange Form Factors at Q^2 ~0.1 GeV^2. Physical Review Letters, American Physical Society, 2007, 98, pp.032301. ⟨10.1103/PhysRevLett.98.032301⟩. ⟨in2p3-00120381⟩

Share

Metrics

Record views

238