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16 April 2024

» pubmed » pmid17358678

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Precision measurements of the nucleon strange form factors at Q2 approximately 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 Craver ; F 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 ; P LaViolette ; J LeRose ; R A Lindgren ; D Lhuillier ; N Liyanage ; D J Margaziotis ; P Markowitz ; D G Meekins ; Z-E Meziani ; R Michaels ; B Moffit ; S Nanda ; V Nelyubin ; K Otis ; K D Paschke ; S K Phillips ; M Poelker ; R Pomatsalyuk ; M Potokar ; Y Prok ; A Puckett ; X Qian ; Y Qiang ; B Reitz ; J Roche ; A Saha ; B Sawatzky ; J Singh ; K Slifer ; S Sirca ; R Snyder ; P Solvignon ; P A Souder ; M L Stutzman ; R Subedi ; R Suleiman ; V Sulkosky ; W A Tobias ; P E Ulmer ; G M Urciuoli ; K Wang ; A Whitbeck ; R Wilson ; B Wojtsekhowski ; H Yao ; Y Ye ; X Zhan ; X Zheng ; S Zhou ; V Ziskin ; ;
Date:	19 Jan 2007
Journal:	Phys Rev Lett, 98 (3), 032301
Abstract:	We report new measurements of the parity-violating asymmetry A(PV) in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with <theta(lab)> approximately 6.0 degrees . The 4He result is A(PV)=(+6.40+/-0.23(stat)+/-0.12(syst))x10(-6). The hydrogen result is A(PV)=(-1.58+/-0.12(stat)+/-0.04(syst))x10(-6). These results significantly improve constraints on the electric and magnetic strange form factors G(E)(s) and G(M)(s). We extract G(E)(s)=0.002+/-0.014+/-0.007 at <Q(2)>=0.077 GeV2, and G(E)(s)+0.09G(M)(s)=0.007+/-0.011+/-0.006 at <Q(2)>=0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
Source:	PubMed, pmid17358678
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