Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-03-23
Phys.Rev.Lett.98:221601,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 1 figure - more references and minor wording changes in v3
Scientific paper
10.1103/PhysRevLett.98.221601
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 $d_{\mathcal{U}}$ looks like a non-integral number $d_{\mathcal{U}}$ of invisible particles. Thus dramatic evidence for a nontrivial scale invariant sector could show up experimentally in missing energy distributions.
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