Collider Signals of Unparticle Physics

Phenomenology of the notion of an unparticle U, recently perceived by Georgi, to describe a scale invariant sector with a nontrivial infrared fixed point at a higher energy scale is explored in details. Behaving like a collection of dU (the scale dimension of the unparticle operator OU) invisible massless particles, this unparticle can be unveiled by measurements of various energy distributions for the processes Z→ff̄U and e^-e⁺→γU at e^-e⁺ colliders, as well as monojet production at hadron colliders. We also study the propagator effects of the unparticle through the Drell-Yan tree-level process and the one-loop muon anomaly.