Charge Asymmetry of Same-Sign Dileptons in $B^0$-$\bar{B}^0$ Mixing

TL;DR

This paper measures the charge asymmetry in same-sign dileptons from $B^0$-$ar{B}^0$ mixing, providing an experimental result with implications for understanding matter-antimatter asymmetry.

Contribution

First measurement of charge asymmetry in same-sign dileptons from $B^0$-$ar{B}^0$ mixing using Belle data at KEKB.

Findings

Measured $A_{sl} = (-1.1 ext{±} 7.9 ext{(stat)} ext{±} 7.0 ext{(sys)}) imes 10^{-3}$

Result consistent with Standard Model predictions

Provides constraints on new physics in $B$ mixing processes.

Abstract

We report a measurement of the charge asymmetry for same-sign dileptons in $B^0$-$\bar{B}^0$ mixing, $A_{\rm sl}$. 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 $A_{\rm sl} = (-1.1 \pm 7.9(\text{stat}) \pm 7.0(\text{sys}))\times 10^{-3}$.