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, P. Bosted, J. R. Calarco, A. Camsonne, G. C. Chang, T. H. Chang, J. P. Chen, Seonho Choi, E. Chudakov, A. Danagoulian, P. Degtyarenko, C. W. De Jager, A. Deur, D. Dutta, K. EgiyanH. Gao, F. Garibaldi, O. Gayou, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, J. O. Hansen, D. Hayes, D. Higinbotham, W. Hinton, T. Horn, C. Howell, T. Hunyady, C. E. Hyde-Wright, X. Jiang, M. K. Jones, M. Khandaker, A. Ketikyan, V. Kubarovsky, K. Kramer, G. Kumbartzki, G. Laveissière, J. Lerose, R. A. Lindgren, D. J. Margaziotis, P. Markowitz, K. McCormick, Z. E. Meziani, R. Michaels, P. Moussiegt, S. Nanda, A. M. Nathan, D. M. Nikolenko, V. Nelyubin, B. E. Norum, K. Paschke, L. Pentchev, C. F. Perdrisat, E. Piasetzky, R. Pomatsalyuk, V. A. Punjabi, I. Rachek, A. Radyushkin, B. Reitz, R. Roche, M. Roedelbronn, G. Ron, F. Sabatie, A. Saha, N. Savvinov, A. Shahinyan, Y. Shestakov, S. Airca, K. Slifer, P. Solvignon, P. Stoler, S. Tajima, V. Sulkosky, L. Todor, B. Vlahovic, L. B. Weinstein, K. Wang, B. Wojtsekhowski, H. Voskanyan, H. Xiang, X. Zheng, L. Zhu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number242001
JournalPhysical Review Letters
Issue number24
StatePublished - 24 Jun 2005


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