Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-07-01
Phys.Rev.D82:094009,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 7 eps figures included. Minor changes to conform with published version
Scientific paper
10.1103/PhysRevD.82.094009
We study an SU(3)^2 axigluon model introduced by Frampton, Shu, and Wang to explain the recent Fermilab Tevatron observation of a significant positive enhancement in the top quark forward-backward asymmetry relative to standard model predictions. First, we demonstrate that data on neutral B_d-meson mixing excludes the region of model parameter space where the top asymmetry is predicted to be the largest. Keeping the gauge couplings below the critical value that would lead to fermion condensation imposes further limits at large axigluon mass, while precision electroweak constraints on the model are relatively mild. Furthermore, by considering an extension to an SU(3)^3 color group, we demonstrate that embedding the model in an extra-dimensional framework can only dilute the axigluon effect on the forward-backward asymmetry. We conclude that axigluon models are unlikely to be the source of the observed top quark asymmetry.
Chivukula Sekhar R.
Simmons Elizabeth H.
Yuan C.--P.
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