Search for Time-Dependent CPT Violation in Hadronic and Semileptonic B Decays

TL;DR

This paper presents a highly sensitive search for CPT violation in B meson decays, providing the most precise measurements to date that show no evidence of CPT violation.

Contribution

It offers the most precise measurement of CPT-violating parameters in the neutral B-meson system using a large data sample from the Belle detector.

Findings

Re(z) consistent with zero within uncertainties

Im(z) consistent with zero within uncertainties

DeltaGamma_d/Gamma_d consistent with zero within uncertainties

Abstract

We report a new sensitive search for CPT violation, which includes improved measurements of the CPT-violating parameter z and the total decay-width difference normalized to the averaged width DeltaGamma_d/Gamma_d of the two Bd mass eigenstates. The results are based on a data sample of 535 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We obtain Re(z) = [+1.9 +/- 3.7 (stat) +/- 3.3 (syst)] x 10^{-2}, Im(z) = [-5.7 +/- 3.3 (stat) +/- 3.3 (syst)] x 10^{-3}, and DeltaGamma_d/Gamma_d = [-1.7 +/- 1.8 (stat) +/- 1.1 (syst)] x 10^{-2}, all of which are consistent with zero. This is the most precise single measurement of these parameters in the neutral B-meson system to date.