Compton-Scattering Cross Section on the Proton at High Momentum Transfer

Journal Article · Fri Apr 13 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.152001· OSTI ID:20951230

Danagoulian, A; Roedelbronn, M; Chang, T -H; Nathan, A M ^[1]; Mamyan, V H ^[2]; Aniol, K A; Margaziotis, D J ^[3]; Annand, J R. M.; Hamilton, D J ^[4]; Bertin, P Y; Camsonne, A; Laveissiere, G ^[5]; Bimbot, L ^[6]; Bosted, P; Paschke, K ^[7]; Calarco, J R ^[8]; Chang, C C; Horn, T; Savvinov, N ^[9]; Chen, J -P ^[10]

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1. University of Illinois, Urbana-Champaign, Illinois 61801 (United States)
2. Yerevan Physics Institute, Yerevan 375036 (Armenia)
3. California State University Los Angeles, Los Angeles, California 90032 (United States)
4. University of Glasgow, Glasgow G12 8QQ, Scotland (United Kingdom)
5. Universite Blaise Pascal/IN2P3, F-63177 Aubiere (France)
6. IPN Orsay, Boite Postale n1 F-91406, Orsay (France)
7. University of Massachusetts, Amherst, Massachusetts 01003 (United States)
8. University of New Hampshire, Durham, New Hampshire 03824 (United States)
9. University of Maryland, College Park, Maryland 20742 (United States)
10. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)

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 GeV{sup 2} 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.

• OSTI ID: 20951230
• Journal Information: Physical Review Letters, Vol. 98, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.98.152001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CENTER-OF-MASS SYSTEM
COMPTON EFFECT
CROSS SECTIONS
MOMENTUM TRANSFER
PERTURBATION THEORY
PHOTONS
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS