Regular Article - Theoretical Physics
Axigluon couplings in the presence of extra color-octet spin-one fields
Centro de Estudios Subatómicos and Instituto de Física, Facultad de Ciencias, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
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Revised: 6 October 2009
Published online: 14 November 2009
In this paper, we study how the interaction of the axigluon with quarks is modified when we introduce new color-octet spin-one fields in a chiral color model. We show that in this case the strength of this interaction is not completely determined by the gauge symmetry anymore and may be significantly weaker than the one predicted in the original chiral color model. In this way, we reinterpret the non-observability of the axigluon at the Tevatron, not as a limit on the axigluon mass, but as a limit on the strength of the axigluon coupling to quarks. Nevertheless, it must be remarked that, because the experimental limits on colored resonances production depend on the mass of the resonance, the limits we find still depend on the mass of the axigluon.
© Springer-Verlag / Società Italiana di Fisica, 2010