Study of the ${\psi }_2(3823)$ and ${\chi }_{c1}(3872)$ states in $B^{+}\to \left(J\psi {\pi }^{+}{\pi }^{-}\right)K^{+}$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +956

The decays $B^{+}\to J/\psi {\pi }^{+}{\pi }^{-}{K}^{+}$ are studied using a data set corresponding to an integrated luminosity of 9fb${}^{-1}$ collected with the LHCb detector in proton-proton co…