1202.0410 (Savrina Daria et al.)

Measurement of the ratio of branching fractions
$\frac{\mathcal{BR}(B^0\to K^*γ)}{\mathcal{BR}(B_s^0\toφγ)}$    [PDF]

Savrina Daria, on behalf of the LHCb collaboration

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
$B_s^0\to\phi\gamma$ decay, which may provide a sensitive probe for the
Standard Model. The LHCb experiment has started to take data at the energy of
$\sqrt{s} = 7 TeV$ in 2010 and the current paper presents the result of the
studies of the two rare radiative decays $B^0\to K^*\gamma$ and
$B_s^0\to\phi\gamma$ with $340 pb^{-1}$ of data taken in the first half of
2011. With this data we have a preliminary measurement of
$\frac{\mathcal{BR}(B^0\to K^*\gamma)}{\mathcal{BR}(B_s^0\to\phi\gamma)} =
1.52\pm0.14(stat.)\pm0.10(syst.)\pm0.12(f_s/f_d)$ and assuming the measured
value of $\mathcal{B}(B^0\to K^*\gamma) = (4.33 \pm 0.15)\times10^{-5}$ we
infer $\mathcal{B}(B_s^0\to \phi\gamma) = (2.8\pm0.5)\times10^{-5}$
\cite{bib:conf}.

View original: http://arxiv.org/abs/1202.0410