Constraints on the Unhiggs Model from Top Quark Decay

Abstract

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. We also use the expected increased accuracy of top decay measurements at the LHC to anticipate further constraints on the Unhiggs.

10 pages, 1 figure; References added, further discussion included; Version accepted for publication in Physical Review D

References in corpus (18)

• Unparticle Physics
• Light scalar at LHC: the Higgs or the dilaton?
• Another Odd Thing About Unparticle Physics
• Bounds on Unparticles from the Higgs Sector
• Unparticles-Higgs Interplay
• Unparticle physics and Higgs phenomenology
• ATLAS sensitivity to top quark and W boson polarization in $t\bar{t}$ events
• The AdS/CFT/Unparticle Correspondence
• Standard Model couplings and collider signatures of a light scalar
• Colored Unparticles
• A No-Lose Theorem for Higgs Searches at a Future Linear Collider
• Holographic Unhiggs
• HEIDI and the unparticle
• The Unhiggs
• Measurement of W-Boson Helicity Fractions in Top-Quark Decays Using costheta*
• Phantom Higgs from Unparticles
• The Higgs as a Portal to Plasmon-like Unparticle Excitations
• Electroweak Precision Observables and the Unhiggs

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• Unconstraining the Unhiggs
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• On Broad Kaluza-Klein Gluons