Search for T, CP and CPT Violation in B0-B0bar Mixing with Inclusive Dilepton Events

TL;DR

This study searches for violations of T, CP, and CPT symmetries in B0-B0bar mixing using a large dataset from the BaBar experiment, providing measurements that test fundamental symmetry principles in particle physics.

Contribution

It presents the first measurement of T, CP, and CPT violation parameters in B0-B0bar mixing using inclusive dilepton events with a comprehensive likelihood fit.

Findings

Measured |q/p|-1 = (-0.8 +/- 2.7(stat) +/- 1.9(syst))e-03

Determined Im(z) = (-13.9 +/- 7.3(stat) +/- 3.2(syst))e-03

Found DeltaGamma x Re(z) = (-7.1 +/- 3.9(stat) +/- 2.0(syst))e-03 ps^{-1}

Abstract

We report the results of a search for T, CP and CPT violation in B0-B0bar mixing using an inclusive dilepton sample collected by the BaBar experiment at the PEP-II B Factory. Using a sample of 232 million BBbar pairs, with a simultaneous likelihood fit of the same-sign and opposite-sign dileptons, we measure the T and CP violation parameter |q/p|-1 = (-0.8 +/- 2.7(stat.) +/- 1.9(syst.))e-03, and the CPT and CP parameters Im(z) = (-13.9 +/- 7.3 (stat.) +/- 3.2(syst.))e-03 and DeltaGamma x Re(z) = (-7.1 +/- 3.9(stat.) +/- 2.0(syst.))e-03 ps^{-1}. The statistical correlation between the measurements of Im(z) and DeltaGamma x Re(z) is 76%.