Strange-Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment

Journal Article · Fri Aug 26 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.092001· OSTI ID:20699368

Armstrong, D S; Averett, T; Bailey, S L; Finn, J M; Griffioen, K A; Moffit, B; Phillips, S K; Secrest, J; Sulkosky, V ^[1]; Arvieux, J; Bimbot, L; Guler, H; Lenoble, J; Marchand, D; Morlet, M; Niccolai, S; Ong, S; Wiele, J van de ^[2]; Asaturyan, R; Mkrtchyan, H ^[3]

---

1. Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States)
2. Institut de Physique Nucleaire d'Orsay, Universite Paris-Sud, F-91406 Orsay Cedex France (France)
3. Yerevan Physics Institute, Yerevan 375036 (Armenia); and others

We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12{<=}Q{sup 2}{<=}1.0 GeV{sup 2}. These asymmetries, arising from interference of the electromagnetic and neutral weak interactions, are sensitive to strange-quark contributions to the currents of the proton. The measurements were made at Jefferson Laboratory using a toroidal spectrometer to detect the recoiling protons from a liquid hydrogen target. The results indicate nonzero, Q{sup 2} dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.

• OSTI ID: 20699368
• Journal Information: Physical Review Letters, Vol. 95, Issue 9; Other Information: DOI: 10.1103/PhysRevLett.95.092001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). G0 Collaboration; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CEBAF ACCELERATOR
ELECTROMAGNETIC FORM FACTORS
ELECTRON-PROTON INTERACTIONS
HYDROGEN
INTERFERENCE
LIQUIDS
MOMENTUM TRANSFER
P INVARIANCE
PARITY
PROTONS
S QUARKS
SPECTROMETERS
WEAK INTERACTIONS