Observation of $J/\psi \varphi$ structures consistent with exotic states from amplitude analysis of $B^{+}\to J/\psi \varphi K^{+}$ decays

LHCb collaboration, R. Aaij, B. Adeva +751

The first full amplitude analysis of $B^{+}\to J/\psi \varphi K^{+}$ with $J/\psi \to {\mu }^{+}{\mu }^{-}$, $\varphi \to K^{+}{K}^{-}$ decays is performed with a data sample of 3 fb${}^{-1}$ of $pp$ collision data collected at $…