Tests of Lorentz and CPT symmetry with hadrons and nuclei

Using chiral-perturbation-theory techniques, we derive the low-energy effective Lagrangian in terms of pions and nucleons that corresponds to a selected set of dimension-five Lorentz- and CPT-violation quark and gluon operators. The form of the effective operators is determined by the symmetry properties of the original Lagrangian. Using the pion-nucleon Lagrangian, we find the Lorentz-violating contributions to comagnetometer experiments. This results in stringent limits on some of the parameters. For some other parameters we find that the best bounds will come from nucleon-nucleon interactions, and we derive the relevant nucleon-nucleon potential. These considerations imply possible new opportunities for spin-precession experiments involving for example the deuteron.