Role of the U(1) ghost beyond leading order in a large-Nc expansion

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dc.contributor.authorMatevosyan, H.
dc.contributor.authorThomas, A.
dc.date.issued2008
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.
dc.description.statementofresponsibilityHrayr H Matevosyan and Anthony W Thomas
dc.identifier.citationJournal of Physics G: Nuclear and Particle Physics, 2008; 35(11):1-11
dc.identifier.doi10.1088/0954-3899/35/11/115006
dc.identifier.issn0954-3899
dc.identifier.issn1361-6471
dc.identifier.orcidMatevosyan, H. [0000-0002-4074-7411]
dc.identifier.orcidThomas, A. [0000-0003-0026-499X]
dc.identifier.urihttp://hdl.handle.net/2440/57964
dc.language.isoen
dc.publisherIOP Publishing Ltd
dc.rights© 2008 IOP Publishing Ltd
dc.source.urihttps://doi.org/10.1088/0954-3899/35/11/115006
dc.titleRole of the U(1) ghost beyond leading order in a large-Nc expansion
dc.typeJournal article
pubs.publication-statusPublished

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