Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-15
Phys.Rev.D74:077901,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 1 figure. v2: reference added
Scientific paper
10.1103/PhysRevD.74.077901
Violations of Lorentz invariance that appear via operators of dimension four or less are completely parameterized in the Standard Model Extension (SME). In the pure photonic sector of the SME, there are nineteen dimensionless, Lorentz-violating parameters. Eighteen of these have experimental upper bounds ranging between 10^{-11} and 10^{-32}; the remaining parameter, k_tr, is isotropic and has a much weaker bound of order 10^{-4}. In this Brief Report, we point out that k_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 Lorentz-violating parameters that are more tightly constrained. Using similar renormalization arguments, we also estimate bounds on Lorentz violating parameters in the pure gluonic sector of QCD.
Carone Christopher D.
Sher Marc
Vanderhaeghen Marc
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