Armstrong, D. S. and Carr, R. and Covrig, S. and Hannelius, L. and Martin, J. W. and McKeown, R. D. (2005) Strange-quark contributions to parity-violating asymmetries in the forward G0 electron-proton scattering experiment. Physical Review Letters, 95 (9). Art. No. 092001. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:20110513-104708300
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We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 ≤ Q^2 ≤ =1.0 GeV^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^2 dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.
|Additional Information:||© 2005 The American Physical Society. Received 17 June 2005; published 26 August 2005. We gratefully acknowledge the strong technical contributions to this experiment from many groups: Caltech, Illinois, LPSC-Grenoble, IPN-Orsay, TRIUMF, and, particularly, the Accelerator, Target, and Hall C groups at Jefferson Lab. This work is supported in part by CNRS (France), DOE (U.S.), NSERC (Canada), and NSF (U.S.).|
|Classification Code:||PACS: 13.60.−r, 11.30.Er, 14.20.Dh, 25.30.Bf|
|Official Citation:||Strange-Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment D. S. Armstrong et al. (G0 Collaboration) Published 26 August 2005 (5 pages) 092001|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||13 May 2011 21:07|
|Last Modified:||26 Dec 2012 13:14|
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