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 http://resolver.caltech.edu/CaltechAUTHORS:20110513-104708300

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Abstract

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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Article

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.).

Funders:

Funding Agency	Grant 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
NSF	UNSPECIFIED

Classification Code:

PACS: 13.60.−r, 11.30.Er, 14.20.Dh, 25.30.Bf

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CaltechAUTHORS:20110513-104708300

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http://resolver.caltech.edu/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

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23660

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CaltechAUTHORS

Deposited By:

Ruth Sustaita

Deposited On:

13 May 2011 21:07

Last Modified:

26 Dec 2012 13:14

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