Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment

Journal Article · Thu Jan 07 23:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.012001· OSTI ID:21386883

Androic, D; Seva, T ^[1]; Armstrong, D S; Bailey, S L; Capuano, C L; Phillips, S K ^[2]; Arvieux, J; Bimbot, L ^[3]; Beck, D H; Muether, M; Williamson, S E ^[4]; Beise, E J; Breuer, H; Ellis, C; Roos, P ^[5]; Benesch, J; Bosted, P; Chao, Y -C; Gaskell, D; Grames, J ^[6]

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1. Department of Physics, University of Zagreb, Zagreb HR-41001 (Croatia)
2. Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States)
3. Institut de Physique Nucleaire d'Orsay, Universite Paris-Sud, F-91406 Orsay Cedex (France)
4. Loomis Laboratory of Physics, University of Illinois, Urbana, Illinois 61801 (United States)
5. Physics Department, University of Maryland, College Park, Maryland 20742 (United States)
6. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)

We have measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q{sup 2}=0.22 and 0.63 GeV{sup 2}. They are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of < or approx. 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial-vector current at these four-momentum transfers.

• OSTI ID: 21386883
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 104; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGEBRAIC CURRENTS
ASYMMETRY
AXIAL-VECTOR CURRENTS
CHARGED PARTICLES
CURRENTS
DEUTERONS
DIMENSIONLESS NUMBERS
DIRECT REACTIONS
ELASTIC SCATTERING
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FORM FACTORS
FOUR MOMENTUM TRANSFER
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MOMENTUM TRANSFER
NUCLEAR REACTIONS
P INVARIANCE
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
QUARKS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
S QUARKS
SCATTERING
STRANGE PARTICLES