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We compute the top quark decay rate in the Unhiggs model. In this model, thelongitudinally polarized W's are unparticles, owing to their Goldstone bosonnature, while the transversely polarized W's are not. Thus the fraction ofdecays with a longitudinal W emitted is different than in the Standard Model.Comparing this calculation to CDF data, we are able to rule out some of theUnhiggs model parameter space. We also use the expected increased accuracy oftop decay measurements at the LHC to anticipate further constraints on theUnhiggs.

Constraints on the Unhiggs Model from Top Quark Decay