Speaker
Description
The Belle experiment at KEK, Japan has at present one of the largest dataset accumulated at $\Upsilon(5\rm S)$ resonance. This dataset produced at $e^+e^-$ centre-of-mass (CM) energy of approximately $10.86$ GeVs correspond to an integrated luminosity of $121.4$ fb$^{-1}$. We have searched for the rare decay for the first time using this accumulated dataset.
The decay is a neutral, charmless, non-leptonic, charged current mediated and strangeness non-conserving rare decay which proceeds via W-exchange and W-annihilation Feynman diagrams within the Standard Model (SM). The theoretical branching fraction (BF) predicted using various methods such as the Flavor Diagram Approach, perturbative QCD, and QCD factorization are, $(0.40\pm 0.27)\times 10^{-6}$, $(0.28\pm 0.09)\times 10^{-6}$, and $(0.13\pm 0.05)\times 10^{-6}$, respectively.
We have analyzed the real data sets for this analysis and the results will be presented at the symposium.
| Session | Beyond the Standard Model |
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