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. 2010 Jan 8;104(1):012001.
doi: 10.1103/PhysRevLett.104.012001. Epub 2010 Jan 8.

Strange quark contributions to parity-violating asymmetries in the backward angle G0 electron scattering experiment

D Androić  1 , D S Armstrong, J Arvieux, S L Bailey, D H Beck, E J Beise, J Benesch, F Benmokhtar, L Bimbot, J Birchall, P Bosted, H Breuer, C L Capuano, Y-C Chao, A Coppens, C A Davis, C Ellis, G Flores, G Franklin, C Furget, D Gaskell, M T W Gericke, J Grames, G Guillard, J Hansknecht, T Horn, M Jones, P M King, W Korsch, S Kox, L Lee, J Liu, A Lung, J Mammei, J W Martin, R D McKeown, M Mihovilovic, A Micherdzinska, H Mkrtchyan, M Muether, S A Page, V Papavassiliou, S F Pate, S K Phillips, P Pillot, M L Pitt, M Poelker, B Quinn, W D Ramsay, J-S Real, J Roche, P Roos, J Schaub, T Seva, N Simicevic, G R Smith, D T Spayde, M Stutzman, R Suleiman, V Tadevosyan, W T H van Oers, M Versteegen, E Voutier, W Vulcan, S P Wells, S E Williamson, S A Wood; G0 Collaboration
Affiliations

Strange quark contributions to parity-violating asymmetries in the backward angle G0 electron scattering experiment

D Androić et al. Phys Rev Lett. .

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 approximately < 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.

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