Study of B0→ρ±π∓ Time-Dependent CP Violation at Belle

Le résumé fourni par la source

We present a time-dependent analysis of $CP$ violation in ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ decays based on a $140\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at KEKB. We obtain the charge asymmetry ${\mathcal{A}}_{CP}^{\ensuremath{\rho}\ensuremath{\pi}}=\ensuremath{-}0.16\ifmmode\pm\else\textpm\fi{}0.10(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.02(\mathrm{syst})$. An unbinned maximum-likelihood fit to the $\ensuremath{\Delta}t$ distributions yields ${C}_{\ensuremath{\rho}\ensuremath{\pi}}=0.25\ifmmode\pm\else\textpm\fi{}0.17(\mathrm{stat}{)}_{\ensuremath{-}0.06}^{+0.02}(\mathrm{syst})$, $\ensuremath{\Delta}{C}_{\ensuremath{\rho}\ensuremath{\pi}}=0.38\ifmmode\pm\else\textpm\fi{}0.18(\mathrm{stat}{)}_{\ensuremath{-}0.04}^{+0.02}(\mathrm{syst})$, ${S}_{\ensuremath{\rho}\ensuremath{\pi}}=\ensuremath{-}0.28\ifmmode\pm\else\textpm\fi{}0.23(\mathrm{stat}{)}_{\ensuremath{-}0.08}^{+0.10}(\mathrm{syst})$, and $\ensuremath{\Delta}{S}_{\ensuremath{\rho}\ensuremath{\pi}}=\ensuremath{-}0.30\ifmmode\pm\else\textpm\fi{}0.24(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.09(\mathrm{syst})$. The direct $CP$ violation parameters for $B\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and $B\ensuremath{\rightarrow}{\ensuremath{\rho}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ decays are ${\mathcal{A}}_{\ensuremath{\rho}\ensuremath{\pi}}^{+\ensuremath{-}}=\ensuremath{-}0.02\ifmmode\pm\else\textpm\fi{}0.16(\mathrm{stat}{)}_{\ensuremath{-}0.02}^{+0.05}(\mathrm{syst})$ and ${\mathcal{A}}_{\ensuremath{\rho}\ensuremath{\pi}}^{\ensuremath{-}+}=\ensuremath{-}0.53\ifmmode\pm\else\textpm\fi{}0.29(\mathrm{stat}{)}_{\ensuremath{-}0.04}^{+0.09}(\mathrm{syst})$.

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