Constraints on Unparticle Interactions from Invisible Decays of Z, Quarkonia and Neutrinos

Understand

Unparticles ($\U$) interact weakly with particles.

• The direct signature of unparticles will be in the form of missing energy.
• We study constraints on unparticle interactions using totally invisible decay modes of $Z$, vector quarkonia $V$ and neutrinos.
• The constraints on the unparticle interaction scale $\Lambda_\U$ are very sensitive to the dimension $d_\U$ of the unparticles.