| Abstract |
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We report preliminary results of a search for CPT and Lorentz violation in
B0-B0bar oscillations using an inclusive dilepton sample collected by the
BABAR experiment at the PEP-II B Factory.
Using a sample of 232 million BBbar pairs, we search for time-dependent
variations in the complex CPT parameter z = z0 + z1*cos(Omega*t^ + phi)
where Omega is the Earth's sidereal frequency and t^ is sidereal time.
We measure Im(z0) = (-14.1 +/- 7.3(stat) +/- 2.4(syst)) x 10E-3,
DeltaGamma*Re(z0) = (-7.2 +/- 4.1(stat) +/- 2.1(syst)) x 10E-3 ps-1,
Im(z1) = (-24.0 +/- 10.7(stat) +/- 5.9(syst)) x 10E-3, and
DeltaGamma*Re(z1) = (-18.8 +/- 5.5(stat) +/- 4.0(syst)) x 10E-3 ps-1,
where DeltaGamma is the difference between the decay rates of the neutral
B mass eigenstates.
The statistical correlation between the measurements of Im(z0) and
DeltaGamma*Re(z0) is 76%; between Im(z1) and DeltaGamma*Re(z1) it is 79%.
These results are used to evaluate expressions involving coefficients for
Lorentz and CPT violation in the general Lorentz-violating standard-model
extension.
In a complementary approach, we examine the spectral power of periodic
variations in z over a wide range of frequencies and find no significant
signal.
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