Precision measurements of the nucleon strange form factors at Q2 ∼ 0.1 GeV2

A. Acha, K. A. Aniol, D. S. Armstrong, J. Arrington, T. Averett, S. L. Bailey, J. Barber, A. Beck, H. Benaoum, J. Benesch, P. Y. Bertin, P. Bosted, F. Butaru, E. Burtin, G. D. Cates, Y. C. Chao, J. P. Chen, E. Chudakov, E. Cisbani, B. CraverF. Cusanno, R. De Leo, P. Decowski, A. Deur, R. J. Feuerbach, J. M. Finn, S. Frullani, S. A. Fuchs, K. Fuoti, R. Gilman, L. E. Glesener, K. Grimm, J. M. Grames, J. O. Hansen, J. Hansknecht, D. W. Higinbotham, R. Holmes, T. Holmstrom, H. Ibrahim, C. W. De Jager, X. Jiang, J. Katich, L. J. Kaufman, A. Kelleher, P. M. King, A. Kolarkar, S. Kowalski, E. Kuchina, K. S. Kumar, L. Lagamba

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228 Scopus citations


We report new measurements of the parity-violating asymmetry APV in elastic scattering of 3 GeV electrons off hydrogen and He4 targets with θlab ≈ 6.0°. The He4 result is APV=(+6.40±0.23(stat) ±0.12(syst))Ã-10-6. The hydrogen result is APV=(-1.58±0.12(stat)±0.04(syst))Ã-10-6. These results significantly improve constraints on the electric and magnetic strange form factors GEs and GMs. We extract GEs=0.002±0. 014±0.007 at Q2

Original languageEnglish (US)
Article number032301
JournalPhysical review letters
Issue number3
StatePublished - 2007


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