Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-02-25
Phys.Rev. C69 (2004) 052201
Physics
Nuclear Physics
Nuclear Theory
9 pages, 6 figures. Replacement fixes some typos, improves references and figures. An error in Fig. 6 was corrected and relate
Scientific paper
10.1103/PhysRevC.69.052201
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, $K_{LL}$, is both large and positive at back angles. For photon laboratory energies of $\le$ 6 GeV, we find that $K_{LL}\ne A_{LL}$, $D_{LL}\ne1$, and that the polarization $P$ can be large.
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