Study of the decay Bs0→J/ψf2′(1525) in μ+μ−K+K− final states

Le résumé fourni par la source

We investigate the decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{+}{K}^{\ensuremath{-}}$ for invariant masses of the ${K}^{+}{K}^{\ensuremath{-}}$ pair in the range $1.35<M({K}^{+}{K}^{\ensuremath{-}})<2\text{ }\text{ }\mathrm{GeV}$. The data sample corresponds to an integrated luminosity of $10.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ accumulated with the D0 detector at the Fermilab Tevatron collider. From the study of the invariant mass and spin of the ${K}^{+}{K}^{\ensuremath{-}}$ system, we find evidence for the two-body decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{f}_{2}^{\ensuremath{'}}(1525)$ and measure the relative branching fraction of the decays ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{f}_{2}^{\ensuremath{'}}(1525)$ and ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$ to be ${R}_{{f}_{2}^{\ensuremath{'}}/\ensuremath{\phi}}=0.19\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.04(\mathrm{syst})$.

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