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The branching fraction of the decay $B_{s}^{0} \rightarrowD_{s}^{(*)+}D_{s}^{(*)-}$ is measured using $pp$ collision data correspondingto an integrated luminosity of $1.0fb^{-1}$, collected using the LHCb detectorat a centre-of-mass energy of $7$TeV. It is found to be \begin{align*}  {\mathcal{B}}(B_{s}^{0}\rightarrow~D_{s}^{(*)+}D_{s}^{(*)-}) = (3.05 \pm 0.10\pm 0.20 \pm 0.34)\%, \end{align*} where the uncertainties are statistical,systematic, and due to the normalisation channel, respectively. The branchingfractions of the individual decays corresponding to the presence of one or two$D^{*\pm}_{s}$ are also measured. The individual branching fractions are foundto be \begin{align*}  {\mathcal{B}}(B_{s}^{0}\rightarrow~D_{s}^{*\pm}D_{s}^{\mp}) = (1.35 \pm 0.06\pm 0.09 \pm 0.15)\%,  \newline{\mathcal{B}}(B_{s}^{0}\rightarrow~D_{s}^{*+}D_{s}^{*-}) = (1.27 \pm0.08 \pm 0.10 \pm 0.14)\%. \end{align*} All three results are the most precisedeterminations to date.

Measurement of the $B_{s}^{0} \rightarrow D_{s}^{(*)+}D_{s}^{(*)-}$ branching fractions

Measurement of the $B_{s}^{0} \rightarrow D_{s}^{()+}D_{s}^{()-}$ branching fractions