Observation of B0→χc0K*0 and evidence for B+→χc0K*+

Le résumé fourni par la source

We present the observation of the decay ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c0}{K}^{*0}$ as well as evidence of ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c0}{K}^{*+}$, with an 8.9 and a 3.6 standard deviation significance, respectively, using a data sample of $454\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4\mathrm{S})\ensuremath{\rightarrow}B\overline{B}$ decays collected with the BABAR detector at the PEP-II $B$ meson factory located at the Stanford Linear Accelerator Center (SLAC). The measured branching fractions are $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c0}{K}^{*0})=(1.7\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c0}{K}^{*+})=(1.4\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, where the first quoted errors are statistical and the second are systematic. We obtain a branching fraction upper limit of $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c0}{K}^{*+})<2.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ at the 90% confidence level.

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