Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716465.0, MPI für Physik / YB 2016
Measurement of the direct $CP$ asymmetry in $\\bar{B}\\rightarrow X_{s+d}\\gamma$ decays with a lepton tag
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review Letters
Journal Abbrev.:Phys.Rev.Lett.
Issue / Number:114
Start Page:151601
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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.
Classification / Thesaurus:Belle II
Comment of the Author/Creator:Published at PRL
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
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