Charge asymmetry of same-sign dileptons in $B^{0} - {\bar{B}}^{0}$ mixing

We report a measurement of the charge asymmetry for same-sign dileptons in

B^{0} - {\bar{B}}^{0}

mixing,

A_{sl}

. The data were collected with the Belle detector at KEKB. Using a data sample of

78 {fb}^{- 1}

recorded at the

Υ (4 S)

resonance and

9 {fb}^{- 1}

recorded at an energy 60 MeV below the resonance, we measure

A_{sl} = (- 1.1 \pm 7.9 (stat) \pm 8.5 (sys)) \times 10^{- 3}

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Charge asymmetry of same-sign dileptons inB0−B¯0mixing