Measurements of Branching Fractions, Polarizations, and Direct CP -Violation Asymmetries in B→ρK* and B→f0(980)K* Decays

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We report searches for $B$-meson decays to the charmless final states $\ensuremath{\rho}{K}^{*}$ and ${f}_{0}(980){K}^{*}$ with a sample of $232\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider. We measure in units of ${10}^{\ensuremath{-}6}$ the following branching fractions, where the first error quoted is statistical and the second systematic, or upper limits are given at the 90% confidence level : $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{K}^{*+})<6.1$, $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}{K}^{*0})=9.6\ifmmode\pm\else\textpm\fi{}1.7\ifmmode\pm\else\textpm\fi{}1.5$, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{\ensuremath{-}}{K}^{*+})<12.0$, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{K}^{*0})=5.6\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}1.3$, $\mathcal{B}\mathbf{(}{B}^{+}\ensuremath{\rightarrow}{f}_{0}(980){K}^{*+}\mathbf{)}=5.2\ifmmode\pm\else\textpm\fi{}1.2\ifmmode\pm\else\textpm\fi{}0.5$, and $\mathcal{B}\mathbf{(}{B}^{0}\ensuremath{\rightarrow}{f}_{0}(980){K}^{*0}\mathbf{)}<4.3$. For the significant modes, we also measure the fraction of longitudinal polarization and the charge asymmetry: ${f}_{L}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}{K}^{*0})=0.52\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.04$, ${f}_{L}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{K}^{*0})=0.57\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.08$, ${\mathcal{A}}_{CP}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}{K}^{*0})=\ensuremath{-}0.01\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.02$, ${\mathcal{A}}_{CP}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{K}^{*0})=0.09\ifmmode\pm\else\textpm\fi{}0.19\ifmmode\pm\else\textpm\fi{}0.02$, and ${\mathcal{A}}_{CP}\mathbf{(}{B}^{+}\ensuremath{\rightarrow}{f}_{0}(980){K}^{*+}\mathbf{)}=\ensuremath{-}0.34\ifmmode\pm\else\textpm\fi{}0.21\ifmmode\pm\else\textpm\fi{}0.03$.

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