Measurement of the Proton’s Electric to Magnetic Form Factor Ratio from

Christopher B Crawford, A Sindile,T Akdogan,Ricardo Alarcon, W Bertozzi,E Booth,T Botto,J Calarco,B Clasie,A DeGrush,TW Donnelly,K Dow,D Dutta,M Farkhondeh,R Fatemi,O Filoti,W Franklin,H Gao,E Geis,S Gilad,W Haeberli,D Hasell, W Hersman,M Holtrop, P Karpius,M Kohl,Hauke Kolster,T Lee,A Maschinot,J Matthews,K McIlhany,N Meitanis,RG Milner,RP Redwine,J Seely, A Shinozaki,S Širca,E Six,T Smith,B Tonguc,C Tschalaer,E Tsentalovich, W Turchinetz, JFJ van den Brand, J Van Der Laan,F Wang, T Wise,Y Xiao,W Xu,C Zhang,Z Zhou, V Ziskin, T Zwart

Physical review letters（2007）

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摘要

We report the first precision measurement of the proton electric to magnetic form factor ratio from spin-dependent elastic scattering of longitudinally polarized electrons from a polarized hydrogen internal gas target. The measurement was performed at the MIT-Bates South Hall Ring over a range of four-momentum transfer squared Q 2 from 0.15 to 0.65 (GeV/c) 2. Significantly improved results on the proton electric and magnetic form factors are obtained in combination with existing cross-section data on elastic electron-proton scattering in the same Q 2 region.

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