| Abstract |
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We report results of a search for CPT and Lorentz violation in
$B^0$-$\overline B^0$ oscillations using inclusive dilepton events from
232 million $\Upsilon(4S) \to B \overline B$ decays recorded by the BABAR
detector at the PEP-II $B$ Factory at SLAC. We find 2.8$\sigma$ significance,
compatible with no signal, for variations in the complex CPT violation
parameter {\sf z} at the Earth's sidereal frequency and extract values for the
quantities $\Delta a_\mu$ in the general Lorentz-violating standard-model
extension. The spectral powers for variations in {\sf z} over the frequency
range 0.26\,year$^{-1}$ to 2.1\,day$^{-1}$ are also compatible with no signal.
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