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Unparticle Physics
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Title: Unparticle Physics
Author: Howard Georgi

I discuss some simple aspects of the low-energy physics of a nontrivial scale invariant sector of an effective field theory - physics that cannot be described in terms of particles. I argue that it is important to take seriously the possibility that the unparticle stuff described by such a theory might actually exist in our world. I suggest a scenario in which some details of the production of unparticle stuff can be calculated. I find that in the appropriate low-energy limit, unparticle stuff with scale dimension d_ U looks like a nonintegral number d_U of invisible particles. Thus dramatic evidence for a nontrivial scale invariant sector could show up experimentally in missing energy distributions.

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