Search for CPT and Lorentz Violation in B0-B¯0 Oscillations with Dilepton Events

We report results of a search for CPT and Lorentz violation in B0-B̅ 0 oscillations using inclusive dilepton events from 232×106 Υ(4S)→BB̅ decays recorded by the BABAR detector at the PEP-II B Factory at SLAC. We find 2.8σ significance, compatible with no signal, for variations in the complex CPT violation parameter z at the Earth’s sidereal frequency and extract values for the quantities Δaμ in the general Lorentz-violating standard-model extension. The spectral powers for variations in z over the frequency range 0.26  yr-1 to 2.1  solar day-1 are also compatible with no signal.