Measurement of branching fraction and direct CP asymmetry in B0→ρ0π0 decays

Le résumé fourni par la source

We report a measurement of the branching fraction of the decay ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{0}$, using $386\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We detect ${51}_{\ensuremath{-}13}^{+14}$ signal events with a significance of 4.2 standard deviations, including systematic uncertainties, and measure the branching fraction to be $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{\ensuremath{\pi}}^{0})=({3.12}_{\ensuremath{-}0.82}^{+0.88}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.33(\mathrm{syst}{)}_{\ensuremath{-}0.68}^{+0.50}(\mathrm{\text{model}}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also perform the first measurement of direct $CP$ violating asymmetry in this mode.

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