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Strange-quark contributions to parity-violating asymmetries in the forward G0 electron-proton scattering experiment

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.

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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.

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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.).
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS) (France)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Issue or Number:9
Classification Code:PACS: 13.60.−r, 11.30.Er, 14.20.Dh, 25.30.Bf
Record Number:CaltechAUTHORS:20110513-104708300
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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.
ID Code:23660
Deposited By: Ruth Sustaita
Deposited On:13 May 2011 21:07
Last Modified:03 Oct 2019 02:48

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