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 Sirca; 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; Jefferson Lab Hall A Collaboration

doi:10.1103/PhysRevLett.98.152001

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

Phys Rev Lett. 2007 Apr 13;98(15):152001. doi: 10.1103/PhysRevLett.98.152001. Epub 2007 Apr 9.

Authors

A Danagoulian¹, 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 Sirca, 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; Jefferson Lab Hall A Collaboration

Affiliation

¹ University of Illinois, Urbana-Champaign, Illinois 61801, USA.

PMID: 17501338
DOI: 10.1103/PhysRevLett.98.152001

Abstract

Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7 GeV2 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.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.