Observation of the Decay Bs0→K0K¯0

Le résumé fourni par la source

We measure the decay ${B}_{s}^{0}\ensuremath{\rightarrow}{K}^{0}{\overline{K}}^{0}$ using data collected at the $\mathrm{\ensuremath{\Upsilon}}(5S)$ resonance with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider. The data sample used corresponds to an integrated luminosity of $121.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. We measure a branching fraction $\mathcal{B}({B}_{s}^{0}\ensuremath{\rightarrow}{K}^{0}{\overline{K}}^{0})=[{19.6}_{\ensuremath{-}5.1}^{+5.8}(\text{stat})\ifmmode\pm\else\textpm\fi{}1.0(\text{syst})\ifmmode\pm\else\textpm\fi{}2.0({N}_{{B}_{s}^{0}{\overline{B}}_{s}^{0}})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.