Speaker
Ms
Deepanwita Dutta
(IIT Guwahati)
Description
We search for the decay $B_{s}\rightarrow\gamma\gamma$ and measure the branching fraction for $B_{s}\rightarrow\phi\gamma$ using 121.4~$\textrm{fb}^{-1}$ of data collected at the $\Upsilon(\mathrm{5}S)$ resonance with the Belle detector at the KEKB asymmetric energy B-factory located at the High Energy Accelerator Research Organization (KEK), Japan. These are flavor changing neutral current processes involving the transition of a \textit{b} to \textit{s} quark which are extremely sensitive to new physics beyond the Standard Model. We measure the branching fraction of $B_{s}\rightarrow\phi\gamma$ to be $(3.6 \pm 0.5 \rm{(stat.)}\pm 0.3 \rm{(syst.)} \pm 0.6 \rm{(f_{s})}) \times 10^{-5}$, which is in a good agreement with the theoretical predictions as well as a recent measurement from LHCb. We observe no statistically significant signal for the $B_{s}\rightarrow\gamma\gamma$ decay and set an upper limit at $3.1\times10^{-6}$ at 90$\%$ C.L. Recent results on these decays will be presented in this talk.
Primary authors
Dr
Bipul Bhuyan
(IIT Guwahati)
Ms
Deepanwita Dutta
(IIT Guwahati)
