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25 April 2024

» pubmed » pmid16486563

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Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon
K A Aniol ; D S Armstrong ; T Averett ; H Benaoum ; P Y Bertin ; E Burtin ; J Cahoon ; G D Cates ; C C Chang ; Y-C Chao ; J-P Chen ; Seonho Choi ; E Chudakov ; B Craver ; F Cusanno ; P Decowski ; D Deepa ; C Ferdi ; R J Feuerbach ; J M Finn ; S Frullani ; K Fuoti ; F Garibaldi ; R Gilman ; A Glamazdin ; V Gorbenko ; J M Grames ; J Hansknecht ; D W Higinbotham ; R Holmes ; T Holmstrom ; T B Humensky ; H Ibrahim ; C W de Jager ; X Jiang ; L J Kaufman ; A Kelleher ; A Kolarkar ; S Kowalski ; K S Kumar ; D Lambert ; P LaViolette ; J LeRose ; D Lhuillier ; N Liyanage ; D J Margaziotis ; M Mazouz ; K McCormick ; D G Meekins ; Z-E Meziani ; R Michaels ; B Moffit ; P Monaghan ; C Munoz-Camacho ; S Nanda ; V Nelyubin ; D Neyret ; K D Paschke ; M Poelker ; R Pomatsalyuk ; Y Qiang ; B Reitz ; J Roche ; A Saha ; J Singh ; R Snyder ; P A Souder ; R Subedi ; R Suleiman ; V Sulkosky ; W A Tobias ; G M Urciuoli ; A Vacheret ; E Voutier ; K Wang ; R Wilson ; B Wojtsekhowski ; X Zheng ; ;
Date:	20 Jan 2006
Journal:	Phys Rev Lett, 96 (2), 022003
Abstract:	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.
Source:	PubMed, pmid16486563
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