Compton-scattering cross section on the proton at high momentum transfer

A. Danagoulian*, V. H. Mamyan, M. Roedelbronn, K. A. Aniol, J. R.M. Annand, P. Y. Bertin, L. Bimbot, P. Bosted, J. R. Calarco, A. Camsonne, C. C. Chang, T. H. Chang, J. P. Chen, Seonho Choi, E. Chudakov, 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, D. J. Hamilton, J. O. Hansen, D. Hayes, D. W. Higinbotham, W. Hinton, T. Horn, C. Howell, T. Hunyady, C. E. Hyde, 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, D. G. Meekins, 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, G. Ron, F. Sabatié, A. Saha, N. Savvinov, A. Shahinyan, Y. Shestakov, S. Širca, 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

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52 Scopus citations

Abstract

Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7GeV2 with a statistical accuracy of a few percent. The scaling power for the s dependence of the cross section at fixed center-of-mass angle was found to be 8.0±0.2, strongly inconsistent with the prediction of perturbative QCD. The observed cross-section values are in fair agreement with the calculations using the handbag mechanism, in which the external photons couple to a single quark.

Original languageAmerican English
Article number152001
JournalPhysical Review Letters
Volume98
Issue number15
DOIs
StatePublished - 9 Apr 2007
Externally publishedYes

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