Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment
D. Androić(University of Zagreb), David Armstrong(William & Mary), J. Arvieux(Université Paris-Sud), Stephanie Bailey(William & Mary), D. Beck(University of Illinois Urbana-Champaign), E. J. Beise(University of Maryland, College Park), J. Benesch(Thomas Jefferson National Accelerator Facility), F. Benmokhtar(University of Maryland, College Park), L. Bimbot(Université Paris-Sud), J. Bírchall(University of Manitoba), P. Bosted(Thomas Jefferson National Accelerator Facility), H. Breuer(University of Maryland, College Park), C. L. Capuano(William & Mary), Yu-Chiu Chao(Thomas Jefferson National Accelerator Facility), A. Coppens(University of Manitoba), C. A. Davis(TRIUMF), C. Ellis(University of Maryland, College Park), G. Flores(New Mexico State University), G. Franklin(Carnegie Mellon University), C. Furget(Centre National de la Recherche Scientifique), D. Gaskell(Thomas Jefferson National Accelerator Facility), Michael Gericke(University of Manitoba), Joseph Grames(Thomas Jefferson National Accelerator Facility), G. Guillard(Centre National de la Recherche Scientifique), J. Hansknecht(Thomas Jefferson National Accelerator Facility), T. Horn(Thomas Jefferson National Accelerator Facility), M. Jones(Thomas Jefferson National Accelerator Facility), P. M. King(Ohio University), W. Korsch(University of Kentucky), S. Kox(Centre National de la Recherche Scientifique), L. Lee(University of Manitoba), J. Liu(California Institute of Technology), A. Lung(Thomas Jefferson National Accelerator Facility), J. Mammei(Virginia Tech), Jean Martin(University of Winnipeg), R. D. McKeown(California Institute of Technology), M. Mihovilovič(Jožef Stefan Institute), A. Micherdzińska(University of Winnipeg), H. Mkrtchyan(A. Alikhanyan National Laboratory), M. Muether(University of Illinois Urbana-Champaign), S. A. Page(University of Manitoba), V. Papavassiliou(New Mexico State University), S. F. Pate(New Mexico State University), S. K. Phillips(William & Mary), P. Pillot(Centre National de la Recherche Scientifique), M. Pitt(Virginia Tech), M. Poelker(Thomas Jefferson National Accelerator Facility), B. Quinn(Carnegie Mellon University), W. D. Ramsay(University of Manitoba), J. S. Réal(Centre National de la Recherche Scientifique), J. Roche(Ohio University), P. G. Roos(University of Maryland, College Park), J. Schaub(New Mexico State University), T. Ševa(University of Zagreb), N. Šimičević(Louisiana Tech University), G. R. Smith(Thomas Jefferson National Accelerator Facility), D. T. Spayde(Hendrix College), Marcy Stutzman(Thomas Jefferson National Accelerator Facility), R. Suleiman(Thomas Jefferson National Accelerator Facility), V. Tadevosyan(A. Alikhanyan National Laboratory), W. T. H. van Oers(University of Manitoba), M. Versteegen(Centre National de la Recherche Scientifique), E. Voutier(Centre National de la Recherche Scientifique), W. Vulcan(Thomas Jefferson National Accelerator Facility), S. P. Wells(Louisiana Tech University), S. E. Williamson(University of Illinois Urbana-Champaign), S. A. Wood(Thomas Jefferson National Accelerator Facility)
Cited by 137Open Access
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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