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Title: Polarization Transfer in Proton Compton Scattering at High Momentum Transfer

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.
Authors:
;  [1] ;  [2] ;  [3] ; ;  [4] ; ; ;  [5] ;  [6] ; ;  [7] ;  [8] ; ; ;  [9] ; ; ; ;  [10] more »;  [11] « less
  1. University of Glasgow, Glasgow G12 8QQ (United Kingdom)
  2. Yerevan Physics Institute, Yerevan 375036 (Armenia)
  3. (United States)
  4. California State University Los Angeles, Los Angeles, California 90032 (United States)
  5. Universite Blaise Pascal/IN2P3, F-63177 Aubiere (France)
  6. IPN, Orsay B.P. no. 1 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. University of Illinois, Urbana-Champaign, Illinois 61801 (United States)
  11. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States) [and others
Publication Date:
OSTI Identifier:
20696397
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 94; Journal Issue: 24; Other Information: DOI: 10.1103/PhysRevLett.94.242001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COMPTON EFFECT; GLUONS; MOMENTUM TRANSFER; PHOTONS; POLARIZATION; PROTONS; QUANTUM CHROMODYNAMICS; QUARKS; REACTION KINETICS; SPIN