Polarization Transfer In Proton Compton Scattering At High Momentum Transfer

D. J. Hamilton,V. H. Mamyan,K. A. Aniol,J. R. M. Annand,P. Y. Bertin, L. Bimbot,Peter Bosted,J. R. Calarco,A. Camsonne,G. C. Chang,T.-H. Chang, J.-P. Chen,Seonho Choi, E. Chudakov,A. Danagoulian,P V Degtyarenko,C. W. de Jager,A. Deur,Dipanwita Dutta,K S Egiyan,H. Gao,F. Garibaldi,R. Gilman,Robert H Gilman,C. Glashausser,C Glashausser,Jonatan Piedra Gomez,J O Hansen,D. Higinbotham,D W Higinbotham,W Hinton,C. Howell,Calvin R Howell,C. E. Hyde-Wright,C E Hydewright,Xiaodong Jiang,A. Ketikyan,V. Koubarovski, A Ketikyan,G. Kumbartzki,G. Laveissiere,G Kumbartzki, R. A. Lindgren,D. J. Margaziotis,P. Markowitz,D J Margaziotis,P Markowitz,Kathy Mccormick,Z E Meziani,A. M. Nathan,D. M. Nikolenko,Sirish Nanda,Alan M Nathan,D M Nikolenko,L. Pentchev,C. F. Perdrisat,E. Piasetzky,R. Pomatsalyuk,V. A. Punjabi, E Piasetzky,A. Radyushkin,V Punjabi,I A Rachek,M. Roedelbronn, B Reitz,F. Sabatie,M Roedelbronn,N. Savvinov,A. Shahinyan,Y. Shestakov, N Savvinov,P. Solvignon,Yu V Shestakov,S. Tajima,V. Sulkosky,P Solvignon,B. Vlahovic,L. B. Weinstein,V Sulkosky,B. Wojtsekhowski,H. Voskanyan,L B Weinstein, Kai Wang,B. Wojtsekhowski,H. Voskanyan,Honglin Xiang,X. Zheng,Lihong Zhu

PHYSICAL REVIEW LETTERS（2005）

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摘要

Compton scattering from the proton was investigated at s=6.9 GeV2 and t=-4.0 GeV2 via polarization transfer from circularly polarized incident photons. The longitudinal and transverse components of the recoil proton polarization were measured. The results are in disagreement with a prediction of perturbative QCD based on a two-gluon exchange mechanism, but agree well with a prediction based on a reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton.

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关键词

compton scattering,degree of freedom,reaction kinetics,reaction mechanism,momentum transfer,elementary particles

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