title: Collider signals of unparticle physics.
abstract: 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 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-->f f U and e- e+-->gammaU 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.
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Kingman
authors.initials: K
authors.lastname: Cheung
authors.forename: Wai-Yee
authors.initials: WY
authors.lastname: Keung
authors.forename: Tzu-Chiang
authors.initials: TC
authors.lastname: Yuan