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Measurement of the relative branching ratio of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>B</mml:mi><mml:mi>s</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo>→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:msub><mml:mi>f</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>980</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="…
We present a measurement of the relative branching fraction, ${R}_{{f}_{0}/\ensuremath{\phi}}$, of ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{f}_{0}(980)$, with ${f}_{0}(980)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, to the process ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$, with $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$. The $J/\ensuremath{\psi}{f}_{0}(980)$ final state corresponds to a $CP$-odd eigenstate of ${B}_{s}^{0}$ that could be of interest in future studies of $CP$ violation. Using $8\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data recorded with …