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https://hdl.handle.net/2440/57964
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Type: | Journal article |
Title: | Role of the U(1) ghost beyond leading order in a large-Nc expansion |
Author: | Matevosyan, H. Thomas, A. |
Citation: | Journal of Physics G: Nuclear and Particle Physics, 2008; 35(11):1-11 |
Publisher: | IOP Publishing Ltd |
Issue Date: | 2008 |
ISSN: | 0954-3899 1361-6471 |
Statement of Responsibility: | Hrayr H Matevosyan and Anthony W Thomas |
Abstract: | The 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. |
Rights: | © 2008 IOP Publishing Ltd |
DOI: | 10.1088/0954-3899/35/11/115006 |
Published version: | http://dx.doi.org/10.1088/0954-3899/35/11/115006 |
Appears in Collections: | Aurora harvest 5 Physics publications |
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