On the gauge invariance of the DVCS amplitude

Details On the gauge invariance of the DVCS amplitude On the gauge invariance of the DVCS amplitude

2000-03-21

arxiv.org/abs/hep-ph/0003203v2

Phys.Rev.D62:071501,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 1 figure, LaTeX; Types fixed, formula for asymmetry completed, one reference added

Scientific paper

10.1103/PhysRevD.62.071501

We analyze in detail the problem of gauge invariance of the deeply vitual Compton scattering (DVCS) amplitude. Using twist 3 one-gluon exchange diagram contributions and the QCD equations of motion, we derive the general gauge invariant expression of the DVCS amplitude on a (pseudo)scalar particle (pion, $He^4$). Similarly to the case of deep inelastic scattering, the amplitude does not depend on the twist-3 quark-gluon correlations at the Born level. The contribution of the derived amplitude to the single-spin asymmetry with longitudinally polarized lepton is calculated.

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