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Examining theories with an extended strong interaction sector such asaxigluons or flavour universal colorons, we find that the constraints obtainedfrom the current data on $t \bar t$ production at the Tevatron are in the rangeof $\sim {\cal O}$ TeV and thus competitive with those obtained from the dijetdata. We point out that for large axigluon/coloron masses, the limits on thecoloron mass may be different than those for the axigluon even for $\cot \xi =1$. We also compute the expected forward-backward asymmetry for the case of theaxigluons which would allow it to be discriminated against the SM as also thecolorons. We further find that at the LHC, the signal should be visible in the$t \bar t$ invariant mass spectrum for a wide range of axigluon and coloronmasses that are still allowed. We point out how top polarisation may be used tofurther discriminate the axigluon and coloron case from the SM as well as fromeach other.

Nonstandard, strongly interacting spin one $t \bar t$ resonances