Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment

Androić, Darko and Armstrong, D. S. and Arvieux, J. and Bailey, S. L. and Beck, D. H. and Beise, E. J. and Benesch, J. and Benmokhtar, F. and Bimbot, L. and Birchall, J. and Bosted, P. and Breuer, H. and Capuano, C. L. and Chao, Y.-C. and Coppens, A. and Davis, C. A. and Ellis, C. and Flores, G. and Franklin, G. and Furget, C. and Gaskell, D. and Gericke, M. T. W. and Grames, J. and Guillard, G. and Hansknecht, J. and Horn, T. and Jones, M. and King, P. M. and Korsch, W. and Kox, S. and Lee, L. and Liu, J. and Lung, A. and Mammei, J. and Martin, J. W. and McKeown, R. D. and Mihovilovic, M. and Micherdzinska, A. and Mkrtchyan, H. and Muether, M. and Page, S. A. and Papavassiliou, V. and Pate, S. F. and Phillips, S. K. and Pillot, P. and Pitt, M. L. and Poelker, M. and Quinn, B. and Ramsay, W. D. and Real, J.-S. and Roche, J. and Roos, P. and Schaub, J. and Ševa, Tomislav and Šimićević, N. and Smith, G. R. and Spayde, D. T. and Stutzman, M. and Suleiman, R. and Tadevosyan, V. and van Oers, W. T. H. and Versteegen, M. and Voutier, E. and Vulcan, W. and Wells, S. P. and Williamson, S. E. and Wood, S. A. (G0 Collaboration) (2010) Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment. Physical Review Letters, 104 (1). pp. 12001-5. ISSN 0031-9007

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Abstract

We have measured parity-violating asymmetries in elastic electron-proton and quasielastic electron deuteron scattering at Q2 0.22 and 0.63 GeV2. They are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of <10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial-vector current at these four-momentum transfers.

Item Type: Article
Keywords: parity-violating asymmetries, axial-vector current, strange quark, charge and magnetic nucleon form factors
Date: January 2010
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2010) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 31 May 2014 22:29
Last Modified: 24 Feb 2016 15:37
URI: http://digre.pmf.unizg.hr/id/eprint/2051

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