CP violation in B-$\bar{B}$ mixing with dilepton events

TL;DR

This paper reports a measurement of charge asymmetry in same-sign dilepton events from B meson mixing, providing insights into CP violation in the B system using Belle detector data.

Contribution

The study presents the first measurement of the charge asymmetry in B0-B0bar mixing using dilepton events at Belle, with improved precision.

Findings

Measured asymmetry: (-0.13 ± 0.60(stat) ± 0.56(sys))%

Data collected at KEKB at the Upsilon(4S) resonance

Results consistent with no CP violation within uncertainties

Abstract

We report a measurement of the charge asymmetry for same-sign dileptons in $B^0$-$\bar B^0$ mixing. The data were collected with the Belle detector at KEKB. Using a data sample of 78 fb^{-1} recorded at the $\Upsilon(4S)$ resonance and 9 fb^{-1} recorded at an energy 60 MeV below the resonance, we measure $\Asl = (-0.13 \pm 0.60(\text{stat}) \pm 0.56(\text{sys}))%$.