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Measurement of the direct CP asymmetry in bar{B}rightarrow X_(s+d)γ decays with a lepton tag
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arxiv 1501.01702 v3 pith:WBGCF7NP submitted 2015-01-08 hep-ex
Measurement of the direct CP asymmetry in bar{B}rightarrow X_(s+d)γ decays with a lepton tag
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We report the measurement of the direct $CP$ asymmetry in the radiative $\bar{B}\rightarrow X_{s+d}\gamma$ decay using a data sample of $(772 \pm 11)\times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ 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 $E^{\rm{*}}_{\gamma} \geq 2.1~{\rm{GeV}}$, where $E^{\rm{*}}_{\gamma}$ is the photon energy in the center-of-mass frame, we obtain $\mathcal{A}_{CP}(\bar{B}\rightarrow X_{s+d}\gamma)= (2.2 \pm 3.9 \pm 0.9) \%$, consistent with the Standard Model prediction.
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