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Unparticle Physics

Howard Georgi
Phys. Rev. Lett. 98, 221601 – Published 29 May 2007

Abstract

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 dU looks like a nonintegral number dU of invisible particles. Thus dramatic evidence for a nontrivial scale invariant sector could show up experimentally in missing energy distributions.

  • Figure
  • Received 24 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.221601

©2007 American Physical Society

Authors & Affiliations

Howard Georgi*

  • Center for the Fundamental Laws of Nature, Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA

  • *Electronic address: georgi@physics.harvard.edu

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Issue

Vol. 98, Iss. 22 — 1 June 2007

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