Strange-quark contributions to parity-violating asymmetries in the forward G0 electron-proton scattering experiment

D. S. Armstrong, J. Arvieux, R. Asaturyan, T. Averett, S. L. Bailey, G. Batigne, D. H. Beck, E. J. Beise, J. Benesch, L. Bimbot, J. Birchall, A. Biselli, P. Bosted, E. Boukobza, H. Breuer, R. Carlini, R. Carr, N. Chant, Y. C. Chao, S. ChattopadhyayR. Clark, S. Covrig, A. Cowley, D. Dale, C. Davis, W. Falk, J. M. Finn, T. Forest, G. Franklin, C. Furget, D. Gaskell, J. Grames, K. A. Griffioen, K. Grimm, B. Guillon, H. Guler, L. Hannelius, R. Hasty, A. Hawthorne Allen, T. Horn, K. Johnston, M. Jones, P. Kammel, R. Kazimi, P. M. King, A. Kolarkar, E. Korkmaz, W. Korsch, S. Kox, J. Kuhn, J. Lachniet, L. Lee, J. Lenoble, E. Liatard, J. Liu, B. Loupias, A. Lung, G. A. MacLachlan, D. Marchand, J. W. Martin, K. W. McFarlane, D. W. McKee, R. D. McKeown, F. Merchez, H. Mkrtchyan, B. Moffit, M. Morlet, I. Nakagawa, K. Nakahara, M. Nakos, R. Neveling, S. Niccolai, S. Ong, S. Page, V. Papavassiliou, S. F. Pate, S. K. Phillips, M. L. Pitt, M. Poelker, T. A. Porcelli, G. Quéméner, B. Quinn, W. D. Ramsay, A. W. Rauf, J. S. Real, J. Roche, P. Roos, G. A. Rutledge, J. Secrest, N. Simicevic, G. R. Smith, D. T. Spayde, S. Stepanyan, M. Stutzman, V. Sulkosky, V. Tadevosyan, R. Tieulent, J. Van De Wiele, W. Van Oers

Research output: Contribution to journalArticle

Abstract

We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12≤Q2≤1.0GeV2. 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.

Original languageEnglish (US)
Article number092001
JournalPhysical review letters
Volume95
Issue number9
DOIs
StatePublished - Aug 26 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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