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Phenomenology of the notion of an unparticle U, recently perceived by Georgi,to describe a scale invariant sector with a non-trivial infrared fixed point ata higher energy scale is explored in details. Behaving like a collection of d_U(the scale dimension of the unparticle operator O_U) invisible masslessparticles, this unparticle can be unveiled by measurements of various energydistributions for the processes Z to fermion pair + U and e-e+ to gamma U ate-e+ colliders, as well as mono-jet production at hadron colliders. We alsostudy the propagator effects of the unparticle through the Drell-Yan tree levelprocess and the one-loop muon anomaly.

Collider signals in unparticle physics