A search for resonancelike structures in the $B_s^0{\pi }^{\pm }$ invariant mass spectrum is performed using proton-proton collision data collected by the CMS experiment at the LHC at $\sqrt{s}=8\mathrm{TeV}$, corresponding to an integrated luminosity of $19.7{\mathrm{fb}}^{-1}$. The $B_s^0$ mesons are reconstructed in the decay chain $B_s^0\to J/\psi \varphi$, with $J/\psi \to {\mu }^{+}{\mu }^{-}$ and $\varphi \to K^{+}{K}^{-}$. The $B_s^0{\pi }^{\pm }$ invariant mass distribution shows no statistically significant peaks for different selection requirements on the reconstructed $B_s^0$ and ${\pi }^{\pm }$ candidates. Upper limits are set on the relative production rates of the $X(5568)$ and $B_s^0$ states times the branching fraction of the decay $X(5568{)}^{\pm }\to B_s^0{\pi }^{\pm }$. In addition, upper limits are obtained as a function of the mass and the natural width of possible exotic states decaying into $B_s^0{\pi }^{\pm }$.

• Received 17 December 2017
• Revised 19 February 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.202005

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