Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-08
Eur.Phys.J. C33 (2004) 91-103
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 8 figures, LaTeX; v2: final version to be published in EPJC, references added, a few changes in the presentation (pa
Scientific paper
10.1140/epjc/s2003-01576-6
Wide-angle photoproduction of pseudoscalar mesons is investigated under the assumption of dominance of the handbag mechanism considering both quark helicity flip and non-flip. The partonic subprocess, meson photoproduction off quarks, is analysed with the help of a covariant decomposition of the subprocess amplitudes which is independent of a specific meson generation mechanism. As examples of subprocess dynamics, however, the twist-2 as well as two-particle twist-3 contributions are explicitly calculated. Characteristic features of the handbag approach are discussed in dependence upon the relative magnitudes of the invariant functions. Differential cross sections and spin correlations are predicted to show a characteristic behaviour which allows to test the underlying assumption of handbag dominance.
Huang Han-Wen
Jakob Rainer
Kroll Peter
Passek-Kumericki Kornelija
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