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

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

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Date

2005-08

Author

Androic, D.

Armstrong, D.S.

Arvieux, J.

Bailey, S.L.

Beck, D.H.

Beise, E.J.

Benesch, J.

Benmokhtar, F.

Bimbot, L.

Birchall, J.

Bosted, P.

Breuer, H.

Capuano, C.L.

Chao, Y.C.

Coppens, A.

Davis, C.A.

Ellis, C.

Flores, G.

Franklin, G.

Furget, C.

Gaskell, D.

Gericke, M.T.W.

Grames, J.

Guillard, G.

Hansknecht, J.

Horn, T.

Jones, M.

King, P.M.

Korsch, W.

Kox, S.

Lee, L.

Liu, J.

Lung, A.

Mammei, J.

Martin, J.W.

McKeown, R.D.

Mihovilovic, M.

Micherdzinska, A.

Mkrtchyan, H.

Muether, M.

Page, S.A.

Papavassiliou, V.

Pate, S.F.

Phillips, S.K.

Pillot, P.

Pitt, M.L.

Poelker, M.

Quinn, B.

Ramsay, W.D.

Real, J.S.

Roche, J.

Roos, P.

Schaub, J.

Seva, T.

Simicevic, N.

Smith, G.R.

Spayde, D.T.

Stutzman, M.

Suleiman, R.

Tadevosyan, V.

van Oers, T.H.

Versteegen, M.

Voutier, E.

Vulcan, W.

Wells, S.P.

Williamson, S.E.

Wood, S.A.

G0 Collaboration

Citation

Androic, D. et al. "Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-proton Scattering Experiment." Physical Review Letters 95, no. 9 (2005): 092001.

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Abstract

We have measured parity-violating asymmetries in elastic electron-proton and quasi-elastic electron-deuteron scattering at Q2 = 0.22 and 0.63 GeV2. They are sensitive to strange quark contributions to currents in the nucleon, and to the nucleon axial 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 current at these four-momentum transfers