Measurement of the direct $CP$ asymmetry in $\bar{B}\to X_{s+d}\gamma$ decays with a lepton tag

Abstract

We report the measurement of the direct $CP$ asymmetry in the radiative $\bar{B}\to X_{s+d}\gamma$ decay using a data sample of $(772\pm 11)\times 10^6$ $B\bar{B}$ pairs collected at the ${\rm Y}(4S)$ 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 $E_{\gamma }^{\ast }\ge 2.1\mathrm{GeV}$, where $E_{\gamma }^{\ast }$ is the photon energy in the center-of-mass frame, we obtain ${\mathcal{A}}_{CP}(\bar{B}\to X_{s+d}\gamma )=(2.2\pm 3.9\pm 0.9)\%$, consistent with the Standard Model prediction.

Published at PRL

References in corpus (3)

• Long-Distance Dominance of the CP Asymmetry in B->X_{s,d}+gamma Decays
• Measurement of B(B-->X_s γ), the B-->X_s γ photon energy spectrum, and the direct CP asymmetry in B-->X_{s+d} γ decays
• Measurements of Direct CP Asymmetries in B to X_s gamma decays using Sum of Exclusive Decays

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