Collider signals in unparticle physics

Abstract

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 at a higher energy scale is explored in details. Behaving like a collection of d_U (the scale dimension of the unparticle operator O_U) invisible massless particles, this unparticle can be unveiled by measurements of various energy distributions for the processes Z to fermion pair + U and e-e+ to gamma U at e-e+ colliders, as well as mono-jet 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.

4 pages including 4 figures

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• Photon Events with Missing Energy in e+e- Collisions at sqrt{s} = 130 to 209 GeV
• Single- and Multi-Photon Events with Missing Energy in e+e- Collisions at LEP
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