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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. Egiyan
  • H. 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

Research output: Contribution to journalArticlepeer-review

53 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 languageEnglish
Article number152001
JournalPhysical Review Letters
Volume98
Issue number15
DOIs
StatePublished - 9 Apr 2007
Externally publishedYes

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