New bounds on isotropic Lorentz violation
Abstract
Violations of Lorentz invariance that appear via operators of dimension four or less are completely parametrized in the Standard Model Extension (SME). In the pure photonic sector of the SME, there are 19 dimensionless, Lorentzviolating parameters. Eighteen of these have experimental upper bounds ranging between 10^{11} and 10^{32}; the remaining parameter, k̃_{tr}, is isotropic and has a much weaker bound of order 10^{4}. In this Brief Report, we point out that k̃_{tr} gives a significant contribution to the anomalous magnetic moment of the electron and find a new upper bound of order 10^{8}. With reasonable assumptions, we further show that this bound may be improved to 10^{14} by considering the renormalization of other Lorentzviolating parameters that are more tightly constrained. Using similar renormalization arguments, we also estimate bounds on Lorentzviolating parameters in the pure gluonic sector of QCD.
 Publication:

Physical Review D
 Pub Date:
 October 2006
 DOI:
 10.1103/PhysRevD.74.077901
 arXiv:
 arXiv:hepph/0609150
 Bibcode:
 2006PhRvD..74g7901C
 Keywords:

 11.30.Cp;
 12.20.m;
 12.60.i;
 13.40.Em;
 Lorentz and Poincare invariance;
 Quantum electrodynamics;
 Models beyond the standard model;
 Electric and magnetic moments;
 High Energy Physics  Phenomenology
 EPrint:
 10 pages, 1 figure. v2: reference added