We report new measurements of the parity-violating asymmetry APV in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with h-lab=6deg. The 4He result is APV=(+6.40+-0.23stat+0.04syst)x10**6. The hydrogen result is APV= (1.58+-0.12stat+-0.04syst)*10**6. These results significantly improve constraints on the electric and magnetic strange form factors GsE and GsM. We extract GsE=0.002+-0.014+-0.007 at Q**2=0.077 GeV2, and GsE+0.09GsM=0.007+-0.011+-0.006 at Q2=0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
Precision measurements of the nucleon strange form factors at Q(2)similar to 0.1 GeV2 RID A-2969-2011
DE LEO, Raffaele;
2007-01-01
Abstract
We report new measurements of the parity-violating asymmetry APV in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with h-lab=6deg. The 4He result is APV=(+6.40+-0.23stat+0.04syst)x10**6. The hydrogen result is APV= (1.58+-0.12stat+-0.04syst)*10**6. These results significantly improve constraints on the electric and magnetic strange form factors GsE and GsM. We extract GsE=0.002+-0.014+-0.007 at Q**2=0.077 GeV2, and GsE+0.09GsM=0.007+-0.011+-0.006 at Q2=0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.File in questo prodotto:
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