Handling the Handbag Diagram in Compton Scattering on the Proton

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Poincare invariance, gauge invariance, conservation of parity and time reversal invariance are respected in an impulse approximation evaluation of the handbag diagram. Proton wave functions, previously constrained by comparison with measured form factors, that incorporate the influence of quark transverse and orbital angular momentum (and the corresponding violation of proton helicity conservation) are used. Computed cross sections are found to be in reasonably good agreement with early measurements. The helicity correlation between the incident photon and outgoing proton, K{sub LL}, is both large and positive at back angles. For photon laboratory energies of {le} 6 GeV, we find that K{sub ... continued below

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9 pages

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Miller, Gerald A. February 25, 2004.

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Poincare invariance, gauge invariance, conservation of parity and time reversal invariance are respected in an impulse approximation evaluation of the handbag diagram. Proton wave functions, previously constrained by comparison with measured form factors, that incorporate the influence of quark transverse and orbital angular momentum (and the corresponding violation of proton helicity conservation) are used. Computed cross sections are found to be in reasonably good agreement with early measurements. The helicity correlation between the incident photon and outgoing proton, K{sub LL}, is both large and positive at back angles. For photon laboratory energies of {le} 6 GeV, we find that K{sub LL} {ne} A{sub LL}, D{sub LL} {ne} 1, and that the polarization P can be large.

Physical Description

9 pages

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INIS; OSTI as DE00837243

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  • Journal Name: Submitted to Phyics Review C; Journal Volume: 69; Journal Issue: 5; Other Information: Submitted to Physics Review C: Volume 69, No.5; Journal Publication Date: 05/2004

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  • Report No.: LBNL--54622
  • Report No.: NT@UW-04-002, ECT-03,arXiv:nucl-th/0402092
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 837243
  • Archival Resource Key: ark:/67531/metadc785599

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  • February 25, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Sept. 1, 2016, 6:59 p.m.

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Miller, Gerald A. Handling the Handbag Diagram in Compton Scattering on the Proton, article, February 25, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc785599/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.