Polarization Transfer in Proton Compton Scattering at High Momentum Transfer

Journal Article · Fri Jun 24 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.242001· OSTI ID:20696397

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

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1. University of Glasgow, Glasgow G12 8QQ (United Kingdom)
2. Yerevan Physics Institute, Yerevan 375036 (Armenia)
3. California State University Los Angeles, Los Angeles, California 90032 (United States)
4. Universite Blaise Pascal/IN2P3, F-63177 Aubiere (France)
5. IPN, Orsay B.P. no. 1 F-91406, Orsay (France)
6. University of Massachusetts, Amherst, Massachusetts 01003 (United States)
7. University of New Hampshire, Durham, New Hampshire 03824 (United States)
8. University of Maryland, College Park, Maryland 20742 (United States)
9. University of Illinois, Urbana-Champaign, Illinois 61801 (United States)
10. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States); and others

Compton scattering from the proton was investigated at s=6.9 GeV{sup 2} and t=-4.0 GeV{sup 2} 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.

• OSTI ID: 20696397
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 94; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPTON EFFECT
GLUONS
MOMENTUM TRANSFER
PHOTONS
POLARIZATION
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS
REACTION KINETICS
SPIN