Search for CPT and Lorentz Violation in B0-B0bar Oscillations with Dilepton Events

TL;DR

This study searches for CPT and Lorentz violation in B0-B0bar oscillations using dilepton events, finding no significant evidence but setting constraints on possible violations within the standard-model extension.

Contribution

First search for CPT and Lorentz violation in B0-B0bar oscillations using a large dataset from BABAR, providing new limits on Lorentz-violating parameters.

Findings

No significant CPT or Lorentz violation detected.

Constraints placed on Lorentz-violating parameters in the standard-model extension.

Spectral power analysis shows compatibility with no signal.

Abstract

We report results of a search for CPT and Lorentz violation in B0-B0bar oscillations using inclusive dilepton events from 232 million Y(4S) --> BBbar decays recorded by the BABAR detector at the PEP-II B Factory at SLAC. We find 2.8sigma 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 \Delta(a_\mu) in the general Lorentz-violating standard-model extension. The spectral powers for variations in z over the frequency range 0.26/year to 2.1/day are also compatible with no signal.