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23 April 2024

» arxiv » nucl-ex/0606015

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Proton G_E/G_M from beam-target asymmetry
M. K. Jones ; A. Aghalaryan ; A. Ahmidouch ; R. Asaturyan ; F. Bloch ; W. Boeglin ; P. Bosted ; C. Carasco ; R. Carlini ; J. Cha ; J.P. Chen ; M. E. Christy ; L. Cole ; L. Coman ; D. Crabb ; S. Danagoulian ; D. Day ; J. Dunne ; M. Elaasar ; R. Ent ; H. Fenker ; E. Frlez ; D. Gaskell ; L. Gan ; J. Gomez ; B. Hu ; J. Jourdan ; C. Keith ; C.E. Keppel ; M. Khandaker ; A. Klein ; L. Kramer ; Y. Liang ; J. Lichtenstadt ; R. Lindgren ; D. Mack ; P. McKee ; D. McNulty ; D. Meekins ; H. Mkrtchyan ; R. Nasseripour ; I. Niculescu ; K. Normand ; B. Norum ; D. Pocanic ; Y. Prok ; B. Raue ; J. Reinhold ; J. Roche ; D. Rohe ; O.A. Rondon ; N. Savvinov ; B. Sawatzky ; M. Seely ; I. Sick ; K. Slifer ; C. Smith ; G. Smith ; S. Stepanyan ; L. Tang ; S. Tajima ; G. Testa ; W. Vulcan ; K. Wang ; G. Warren ; F.R. Wesselmann ; S. Wood ; C. Yan ; L. Yuan ; J. Yun ; M. Zeier ; H. Zhu ;
Date:	7 Jun 2006
Abstract:	The ratio of the proton’s electric to magnetic form factor, G_E/G_M, can be extracted in elastic electron-proton scattering by measuring either cross sections, beam-target asymmetry or recoil polarization. Separate determinations of G_E/G_M by cross sections and recoil polarization observables disagree for Q^2 > 1 (GeV/c)^2. Measurement by a third technique might uncover an unknown systematic error in either of the previous measurements. The beam-target asymmetry has been measured for elastic electron-proton scattering at Q^2 = 1.51 (GeV/c)^2 for target spin orientation aligned perpendicular to the beam momentum direction. This is the largest Q^2 at which G_E/G_M has been determined by a beam-target asymmetry experiment. The result, muG_E/G_M = 0.884 +/- 0.027 +/- 0.029, is compared to previous world data.
Source:	arXiv, nucl-ex/0606015
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