Related Experiment Video
Updated: Jul 13, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Unparticle physics
1Center for the Fundamental Laws of Nature, Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA. georgi@physics.harvard.edu
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.
More Related Videos
Related Concept Videos
Subatomic Particles
The Uncertainty Principle
First Law: Particles in One-dimensional Equilibrium
Collisions in Multiple Dimensions: Introduction
Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision
Atomic Structure

