Parity-Violating Electron Scattering from {sup 4}He and the Strange Electric Form Factor of the Nucleon

Journal Article · Fri Jan 20 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.022003· OSTI ID:20775036

Aniol, K A; Margaziotis, D J ^[1]; Armstrong, D S; Averett, T; Finn, J M; Holmstrom, T; Kelleher, A; Moffit, B; Sulkosky, V ^[2]; Benaoum, H; Holmes, R; Souder, P A ^[3]; Bertin, P Y; Ferdi, C ^[4]; Burtin, E; Lhuillier, D; Munoz-Camacho, C; Neyret, D; Vacheret, A ^[5]; Cahoon, J ^[6]

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1. California State University, Los Angeles, Los Angeles, California 90032 (United States)
2. College of William and Mary, Williamsburg, Virginia 23187 (United States)
3. Syracuse University, Syracuse, New York 13244 (United States)
4. Universite Blaise Pascal/CNRS-IN2P3, F-63177 Aubiere (France)
5. CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette (France)
6. University of Massachusetts Amherst, Amherst, Massachusetts 01003 (United States)

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 deg. 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{sub (stat)}{+-}0.21{sub (syst)})x10{sup -6} yields a value of G{sub E}{sup s}=-0.038{+-}0.042{sub (stat)}{+-}0.010{sub (syst)}, consistent with zero.

• OSTI ID: 20775036
• Journal Information: Physical Review Letters, Vol. 96, Issue 2; Other Information: DOI: 10.1103/PhysRevLett.96.022003; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
ELASTIC SCATTERING
ELECTRON DIFFRACTION
ELECTRONS
FORM FACTORS
FOUR MOMENTUM TRANSFER
HELIUM 4
NUCLEONS
PARITY
POLARIZATION