Unparticle Physics and Universality
We discuss a nonrelativistic version of Georgi's "unparticle physics".
An "un-nucleus" is a field in a nonrelativistic conformal
field theory characterized by a mass and a scaling dimension.
It is realized approximately in high-energy nuclear reactions
involving emission of a few neutrons with relative energies
between about 0.1 MeV and 5 MeV. Conformal symmetry predicts a
universal power law behavior of the inclusive cross section in this
kinematic regime and relates it to the energy levels of fermions in a
harmonic trap. Certain bosonic systems may also show unparticle
behavior. We argue that it may be possible to create unparticles of
neutral D mesons in short-distance reactions at the LHC.