Measurement of the direct CP asymmetry in B � ?xs+d? decays with a lepton tag

We report the measurement of the direct CP asymmetry in the radiative B�?Xs+d? decay using a data sample of (772�11)�106 BB� pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The CP asymmetry is measured as a function of the photon energy threshold. For E???2.1GeV, where E?? is the photon energy in the center-of-mass frame, we obtain ACP(B�?Xs+d?)=(2.2�3.9�0.9)%, consistent with the standard model prediction. � 2015 American Physical Society.