Observation of radiative B -> phi K gamma decays

Abstract

The radiative decay $B\to \varphi K\gamma$ is observed for the first time. The branching fraction for the charged $B^{-}\to \varphi K^{-}\gamma$ decay mode is measured to be $\mathcal{B}(B^{-}\to \varphi K^{-}\gamma )=(3.4\pm 0.9\pm 0.4)\times 10^{-6}$. The photon energy distribution for the $B^{-}\to \varphi K^{-}\gamma$ decay is presented. The signal for the neutral ${\bar{B}}^0\to \varphi {\bar{K}}^0\gamma$ decay mode is not statistically significant and an upper limit, $\mathcal{B}({\bar{B}}^0\to \varphi {\bar{K}}^0\gamma )<8.3\times 10^{-6}$ at $90$, is set. The analysis is based on a dataset of 90 fb${}^{-1}$ collected by the Belle experiment at the $e^{+}{e}^{-}$ asymmetric collider KEKB.

9 pages, 2 pages (7 eps files)

References in corpus (7)

• Branching Fraction and Photon Energy Spectrum b -> s gamma
• A Measurement of the Branching Fraction for the Inclusive B --> X(s) gamma Decays with the Belle Detector
• Present Status of Inclusive Rare B Decays
• Study of Exclusive Radiative B Meson Decays
• Measuring the Photon Helicity in Radiative B Decays
• Radiative B Meson Decays into K pi gamma and K pi pi gamma Final States
• Measurement of B-->K*gamma Branching Fractions and Charge Asymmetries

Cited by in corpus (11)

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• Vector-pseudoscalar two-meson distribution amplitudes in three-body $B$ meson decays
• Mixing-Induced CP Violation in B -> P_1 P_2 gamma in Search of Clean New Physics Signals
• Measurement of the CP Asymmetry in B -> X_s gamma
• Observation of B+ -> K+ eta gamma
• Null tests of the Standard Model at an International Super $B$ Factory
• Measurement of B Decays to phi K gamma
• Measurement of Branching Fractions in Radiative B Decays to eta K gamma and Search for B Decays to eta' K gamma
• First Observation of Radiative B^0 -> ϕK^0 γDecays and Measurements of Their Time-Dependent CP Violation
• On the photon polarization in radiative B -> phi K gamma decay
• Search for $B^0\to K_S^0{K}_S^0\gamma$ decays at Belle