Measurement of the ratio of branching fractions BR( B 0→K*γ) BR( B s 0→ϕγ) ${{BR({B^0} o K*gamma )} over {BR(B_s^0 o phi gamma )}}$

• Main Author: Daria Savrina
• Format: Article
• Language: English
• Published: EDP Sciences 2012-06-01
• Series: EPJ Web of Conferences
• Online Access: http://dx.doi.org/10.1051/epjconf/20122812031

The interest to the rare radiative decays of the B-mesons at LHCb is mostly aroused due to the measurement of the photon polarization in the Bs0 → ϕγ decay, which may provide a sensitive probe for the Standard Model. The LHCb experiment has started to take data at the energy of √s = 7 TeV in 2010 and the current paper presents the result of the studies of the two rare radiative decays B0 → K*γ and Bs0 → ϕγ with 340 pb−1 of data taken in the first half of 2011. With this data we have a preliminary measurement of BR(B0→K*γ)BR(Bs0→ϕγ) ${{BRleft({{B^0} o K*gamma} ight)} over {BRleft({B_s^0 o phi gamma} ight)}}$ = 1.52±0.14(stat.)±0.10(syst.)±0.12(fs/fd) and assuming the measured value of B $mathcal{B}$ (B0 → K*γ) = (4.33 ± 0.15) × 10.5 we infer B $mathcal{B}$ (Bs0 → ϕγ) = (2.8 ± 0.5) × 10−5 [1]