Quark contribution to the reggeon-reggeon-gluon vertex in QCD
V.S. Fadin, R. Fiore, A. Quartarolo
TL;DR
This paper calculates the quark loop contribution to the reggeon-reggeon-gluon vertex in QCD, revealing new spin structures and partial cancellations with gluon contributions, advancing understanding of high-energy QCD interactions.
Contribution
It introduces the calculation of quark loop effects on the reggeon-reggeon-gluon vertex, highlighting new spin structures not present in the Born approximation.
Findings
Identification of new spin structure in the vertex.
Partial cancellation between gluon and quark contributions.
Relevance for three massless quark flavors.
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.
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