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dc.contributor.authorMatevosyan, H.en
dc.contributor.authorThomas, A.en
dc.identifier.citationJournal of Physics G-Nuclear and Particle Physics, 2008; 35(11):1-11en
dc.description.abstractThe 1/Nc expansion is one of the very few methods we have for generating a systematic expansion of QCD at the energy scale relevant to hadron structure. The present formulation of this theory relies on the double-line notation for calculating the leading order of a diagram in the 1/Nc expansion, where the local SU(Nc) gauge symmetry is substituted by a U(Nc) symmetry and the associated U(1) ghost field is ignored. In the current work we demonstrate the insufficiency of this formulation for describing certain non-planar diagrams of interest in current attempts to model QCD. We derive a more complete set of Feynman rules that include the U(1) ghost field and provide a useful tool for calculating both color factors and 1/Nc orders of all color-singlet diagrams.en
dc.description.statementofresponsibilityHrayr H Matevosyan and Anthony W Thomasen
dc.publisherIOP Publishing Ltden
dc.rights© 2008 IOP Publishing Ltden
dc.titleRole of the U(1) ghost beyond leading order in a large-Nc expansionen
dc.typeJournal articleen
pubs.library.collectionPhysics publicationsen
dc.identifier.orcidMatevosyan, H. [0000-0002-4074-7411]en
dc.identifier.orcidThomas, A. [0000-0003-0026-499X]en
Appears in Collections:Physics publications

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