Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon.
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from 4He at an average scattering angle <theta(lab)> = 5.7 degrees and a four-momentum transfer Q2 = 0.091 GeV2 . From these data, for the first time, the strange electric form factor of the nucleon G(E)s can be isolated. The measured asymmetry of A(PV) = (6.72 +/- 0.84(stat) +/- 0.21(syst) x 10(-6) yields a value of G(E)s = -0.038 +/- 0.042(stat) +/- 0.010(syst), consistent with zero.
Aniol
K A
KA
California State University, Los Angeles, Los Angeles, California 90032, USA.
Armstrong
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Averett
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Benaoum
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Bertin
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Burtin
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Cahoon
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Cates
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Chang
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Chen
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Seonho
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Chudakov
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Craver
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Decowski
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Feuerbach
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Frullani
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Garibaldi
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Gilman
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Glamazdin
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Gorbenko
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Grames
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Hansknecht
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Higinbotham
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Holmes
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Holmstrom
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Humensky
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Ibrahim
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de Jager
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Kaufman
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Kelleher
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Kowalski
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Kumar
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Lambert
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LaViolette
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LeRose
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Margaziotis
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McCormick
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Vacheret
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Wang
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Wilson
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Zheng
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