Speaker
Description
We search for the decay of $B^0\rightarrow \gamma\gamma$ using 711$fb^{-1}$ of data collected at $\Upsilon$(4S) resonance by the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider located at High Energy Accelerator Research Organization (KEK), Japan. It is a Flavor Changing Neutral Current (FCNC) process which can be described by a penguin loop diagram in the leading order. The decay process is yet to be observed with an expected branching ratio of $3\times10^{-8}$ in the Standard Model (SM). The decay is sensitive to New Physics (NP) beyond the SM, since a new particle such as a charged Higgs may enter the penguin loop and can change its branching ratio. The best previous experimental upper limit on the branching ratio for this decay is $1.7\pm1.1(stat.)\pm0.2(syst.)\times10^{-7}$ at $90\%$ confidence level set by the BaBar experiment using 426$fb^{-1}$ data. The Belle collaboration has also put an upper limit on its branching ratio at $6.2\times10^{-7}$ at $90\%$ confidence level using 104$fb^{-1}$ of data. Using the final data set from the Belle experiment, we expect to reach the SM sensitivity for this decay.
| Session | Quark and Lepton Flavour Physics |
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