Quark contribution to the reggeon-reggeon-gluon vertex in QCD
arXiv:hep-th/9405127 · doi:10.1103/PhysRevD.50.5893
Abstract
The quark loop contribution to the reggeon-reggeon-gluon vertex is calculated in QCD, where the reggeon is the reggeized gluon. Compared with the vertex in the Born approximation, this contribution exhibits a new spin structure as well as the gluon loop one. A remarkable but not complete cancellation between gluon and quark contributions to this new spin structure takes place for the case of three massless quark flavours.
19 pages + 2 figures(appended as a postscript file), Latex