Transverse Beam Spin Asymmetries In Forward-Angle Elastic Electron-Proton Scattering

Armstrong D S, Francois Arvieux,R A Asaturyan,Averett T,Stephanie Bailey,Batigne G,Beck D H,Beise E J,Benesch J,Bimbot L,James Caradoc Birchall, A S Biselli,Peter Bosted, Boukobza E,Breuer H,Carlini R,Robert W Carr,N S Chant,Yuchiu Chao,Swapan Chattopadhyay,Clark R,Covrig S,A A Cowley,Dale D,Charles S Davis,W R Falk,John M Finn,T A Forest,Gregg E Franklin, Furget C,David R Gaskell,Grames J,Griffioen K A,Grimm K,Guillon B,Guler H,Hannelius L,Hasty R, Alice Hawthorne Allen,Tanja Horn,Kathleen Johnston,Mark K Jones,Kammel P,Reza Kazimi,Paul King,Kolarkar A,Korkmaz E,Korsch W,Kox S,Joachim Kuhn,Lachniet J,Lawrence Lee,Lenoble J,Liatard E,Jianglai Liu,Loupias B,Lung A,Dominique Marchand,Martin J W,McFarlane K W, McKee D W,McKeown R D,Merchez F,Hamlet Mkrtchyan,Moffit B,Morlet M,Itaru Nakagawa,Kazutaka Nakahara,Neveling R,S Niccolai, Soohwan Ong, Papavassiliou V,V Papavassiliou,Phillips S K,S K Phillips,Poelker M,Benard Poelker,Quéméner G,G Quemener,Ramsay W D,W D Ramsay,Real J-S,Jeansebastien Real,Julie La Roche,Rutledge G A,G A Rutledge,Simicevic N,N Simicevic,Spayde D T,Stepanyan S, S G Stepanyan,M L Stutzman,Tadevosyan V, V Tadevosyan,Van de Wiele J, Jacques Van De Wiele,Willem Van Oers,E Voutier,W F Vulcan, Wells S P,Williamson S E, S E Williamson, S P Wood,Chen Yan,Junho Yun,Valdis Zeps

PHYSICAL REVIEW LETTERS（2007）

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摘要

We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q(2)=0.15, 0.25 (GeV/c)(2). The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A(n) provides a direct probe of the imaginary component of the 2 gamma exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

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关键词

elastic and compton scattering,electromagnetic processes and prop- erties,protons and neutrons,elastic electron scattering,electrons,spin,scattering,quantum mechanics,elastic scattering,protons,nucleons,elementary particles,asymmetry,electron scattering,electron beam,accuracy

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