publication . Article . Other literature type . 2006

Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon.

Yi Qiang; Douglas W. Higinbotham; malek mazouz; Hassan Ibrahim; Jaideep Singh; Eric Voutier; Krishna Kumar;
Open Access English
  • Published: 18 Jan 2006 Journal: Physical review letters, volume 96, issue 2 (issn: 0031-9007, eissn: 1079-7114, Copyright policy)
  • Country: United Kingdom
Abstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from {sup 4}He at an average scattering angle {theta}{sub lab} = 5.7 degrees and a four-momentum transfer Q{sup 2} = 0.091 GeV{sup 2}. From these data, for the first time, the strange electric form factor of the nucleon G{sub E}{sup s} can be isolated. The measured asymmetry of A{sub PV} = 6.72 {+-} 0.84 (stat) {+-} 0.21 (syst) parts per million yields a value of G{sub E}{sup s} = -0.038 {+-} 0.042 (stat) {+-} 0.010 (syst), consistent with zero.
Subjects
arXiv: High Energy Physics::ExperimentNuclear Experiment
free text keywords: General Physics and Astronomy
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