Polarization transfer in proton compton scattering at high momentum transfer
Compton scattering from the proton was investigated at s=6.9GeV2 and t=-4.0GeV2 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. © 2005 The American Physical Society.
Hamilton, DJ; Mamyan, VH; Aniol, KA; Annand, JRM; Bertin, PY; Bimbot, L; Bosted, P; Calarco, JR; Camsonne, A; Chang, GC; Chang, TH; Chen, JP; Choi, S; Chudakov, E; Danagoulian, A; Degtyarenko, P; De Jager, CW; Deur, A; Dutta, D; Egiyan, K; Gao, H; Garibaldi, F; Gayou, O; Gilman, R; Glamazdin, A; Glashausser, C; Gomez, J; Hansen, JO; Hayes, D; Higinbotham, D; Hinton, W; Horn, T; Howell, C; Hunyady, T; Hyde-Wright, CE; Jiang, X; Jones, MK; Khandaker, M; Ketikyan, A; Kubarovsky, V; Kramer, K; Kumbartzki, G; Laveissière, G; Lerose, J; Lindgren, RA; Margaziotis, DJ; Markowitz, P; McCormick, K; Meziani, ZE; Michaels, R; Moussiegt, P; Nanda, S; Nathan, AM; Nikolenko, DM; Nelyubin, V; Norum, BE; Paschke, K; Pentchev, L; Perdrisat, CF; Piasetzky, E; Pomatsalyuk, R; Punjabi, VA; Rachek, I; Radyushkin, A; Reitz, B; Roche, R; Roedelbronn, M; Ron, G; Sabatie, F; Saha, A; Savvinov, N; Shahinyan, A; Shestakov, Y; Airca, S; Slifer, K; Solvignon, P; Stoler, P; Tajima, S; Sulkosky, V; Todor, L; Vlahovic, B; Weinstein, LB; Wang, K; Wojtsekhowski, B; Voskanyan, H; Xiang, H; Zheng, X; Zhu, L
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