Paper
Quark contribution to the reggeon-reggeon-gluon vertex in QCD
Authors
V. S. Fadin, R. Fiore, A. Quartarolo
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.