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

TL;DR

This paper reports precise measurements of the branching fractions for the decay of B_s^0 into D_s^{(*)+}D_s^{(*)-} using LHCb data, providing the most accurate values to date.

Contribution

First precise measurement of B_s^0 to D_s^{(*)+}D_s^{(*)-} branching fractions using 7 TeV LHCb data, improving previous estimates.

Findings

Measured total branching fraction as (3.05 ± 0.10 ± 0.20 ± 0.34)%

Measured individual branching fractions for D_s^{*\pm}D_s^{\mp} and D_s^{*+}D_s^{*-}

Results are the most precise to date.

Abstract

The branching fraction of the decay $B_{s}^{0} \rightarrow D_{s}^{(*)+}D_{s}^{(*)-}$ is measured using $pp$ collision data corresponding to an integrated luminosity of $1.0fb^{-1}$, collected using the LHCb detector at 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 branching fractions of the individual decays corresponding to the presence of one or two $D^{*\pm}_{s}$ are also measured. The individual branching fractions are found to 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 \pm 0.08 \pm 0.10 \pm 0.14)\%. \end{align*} All three results are the most precise determinations to date.