Abstract
We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers . 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, dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.
- Received 17 June 2005
DOI:https://doi.org/10.1103/PhysRevLett.95.092001
©2005 American Physical Society