Strange-Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment
David Armstrong(William & Mary), J. Arvieux(Université Paris-Sud), R. Asaturyan(A. Alikhanyan National Laboratory), T. Averett(William & Mary), Stephanie Bailey(William & Mary), G. Batigne(Laboratoire de Physique Subatomique et de Cosmologie), Kenneth M. Beck(University of Illinois Urbana-Champaign), E. J. Beise(University of Maryland, College Park), J. Benesch(Thomas Jefferson National Accelerator Facility), L. Bimbot(Université Paris-Sud), J. Bírchall(University of Manitoba), A. S. Biselli(Carnegie Mellon University), P. Bosted(Thomas Jefferson National Accelerator Facility), E. Boukobza(Université Paris-Sud), H. Breuer(University of Maryland, College Park), R. Carlini(Thomas Jefferson National Accelerator Facility), R. Carr(California Institute of Technology), N. S. Chant(University of Maryland, College Park), Yu-Chiu Chao(Thomas Jefferson National Accelerator Facility), S. Chattopadhyay(Thomas Jefferson National Accelerator Facility), Robert Beck Clark(Carnegie Mellon University), S. Covrig(California Institute of Technology), A. A. Cowley(University of Maryland, College Park), D. Dale(University of Kentucky), C. A. Davis(TRIUMF), W. R. Falk(University of Manitoba), J. M. Finn(William & Mary), T. A. Forest(Louisiana Tech University), G. Franklin(Carnegie Mellon University), C. Furget(Laboratoire de Physique Subatomique et de Cosmologie), D. Gaskell(Thomas Jefferson National Accelerator Facility), Joseph Grames(Thomas Jefferson National Accelerator Facility), K. A. Griffioen(William & Mary), K. Grimm(William & Mary), B. Guillon(Laboratoire de Physique Subatomique et de Cosmologie), H. Guler(Université Paris-Sud), L. Hannelius(California Institute of Technology), R. Hasty(University of Illinois Urbana-Champaign), A. M. Hawthorne-Allen(Virginia Tech), T. Horn(University of Maryland, College Park), K. Johnston(Louisiana Tech University), M. Jones(Thomas Jefferson National Accelerator Facility), P. Kammel(University of Illinois Urbana-Champaign), R. Kazimi(Thomas Jefferson National Accelerator Facility), P. M. King(University of Illinois Urbana-Champaign), A. Kolarkar(University of Kentucky), E. Korkmaz(University of Northern British Columbia), W. Korsch(University of Kentucky), S. Kox(Laboratoire de Physique Subatomique et de Cosmologie), J. Kühn(Carnegie Mellon University), J. Lachniet(Carnegie Mellon University), L. Lee(University of Manitoba), J. Lenoble(Université Paris-Sud), E. Liatard(Laboratoire de Physique Subatomique et de Cosmologie), Jianglai Liu(University of Maryland, College Park), B. Loupias(Université Paris-Sud), A. Lung(Thomas Jefferson National Accelerator Facility), G. A. MacLachlan(New Mexico State University), D. Marchand(Université Paris-Sud), Jean Martin(California Institute of Technology), K. W. McFarlane(Hampton University), David McKee(New Mexico State University), R. D. McKeown(California Institute of Technology), F. Merchez(Laboratoire de Physique Subatomique et de Cosmologie), H. Mkrtchyan(A. Alikhanyan National Laboratory), B. Moffit(William & Mary), M. Morlet(Université Paris-Sud), I. Nakagawa(University of Kentucky), K. Nakahara(University of Illinois Urbana-Champaign), M. Nakos(New Mexico State University), R. Neveling(University of Illinois Urbana-Champaign), S. Niccolai(Université Paris-Sud), S. Ong(Université Paris-Sud), S. A. Page(University of Manitoba), V. Papavassiliou(New Mexico State University), S. F. Pate(New Mexico State University), S. K. Phillips(William & Mary), M. Pitt(Virginia Tech), Matt Poelker(Thomas Jefferson National Accelerator Facility), T. A. Porcelli(University of Northern British Columbia), G. Qúeḿener(Laboratoire de Physique Subatomique et de Cosmologie), B. Quinn(Carnegie Mellon University), W. D. Ramsay(University of Manitoba), A. W. Rauf(University of Manitoba), J. S. Réal(Laboratoire de Physique Subatomique et de Cosmologie), J. Roche(William & Mary), P. G. Roos(University of Maryland, College Park), G. A. Rutledge(University of Manitoba), J. A. Secrest(William & Mary), N. Šimičević(Louisiana Tech University), G. R. Smith(Thomas Jefferson National Accelerator Facility), D. T. Spayde(University of Illinois Urbana-Champaign), S. Stepanyan(A. Alikhanyan National Laboratory), Marcy Stutzman(Thomas Jefferson National Accelerator Facility), V. Sulkosky(William & Mary), V. Tadevosyan(A. Alikhanyan National Laboratory), R. Tieulent(Laboratoire de Physique Subatomique et de Cosmologie), J. Van de Wiele(Université Paris-Sud), W. van Oers(University of Manitoba), E. Voutier(Laboratoire de Physique Subatomique et de Cosmologie), W. Vulcan(Thomas Jefferson National Accelerator Facility), G. Warren(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), Chao Yan(Thomas Jefferson National Accelerator Facility), J. Yun(Virginia Tech), V. Zeps(University of Kentucky)
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Abstract
We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12 < or =Q2 < or =1.0 GeV2. 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, Q2 dependent, strange-quark contributions and provide new information beyond that obtained in previous experiments.
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