Evidence for a $B_s^0{\pi }^{\pm }$ State

D0 Collaboration

We report evidence of a narrow structure, $X(5568)$, in the decay sequence $X(5568)\to B_s^0{\pi }^{\pm }$, $B_s^0\to J/\psi \varphi$, $J/\psi \to {\mu }^{+}{\mu }^{-}$, $ϕ\rightarrow K^…