Evidence for exotic hadron contributions to ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decays

LHCb collaboration, R. Aaij, C. Abellán Beteta +739

A full amplitude analysis of ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV $pp$ collisions, corresponding to an integ…