Constraints on the Unhiggs Model from Top Quark Decay

Understand

We compute the top quark decay rate in the Unhiggs model.

• In this model, the longitudinally polarized W's are unparticles, owing to their Goldstone boson nature, while the transversely polarized W's are not.
• Thus the fraction of decays 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 the Unhiggs model parameter space.