Recent Studies of Exotic Hadrons at the LHCb Experiment

Recent results on studies of exotic hadrons at the LHCb experiment are summarised. These are the observation of new resonances decaying to J/\psi K^+ J / ψ K + and J/\psi\phi J / ψ ϕ , evidence of a J/\psi\Lambda J / ψ Λ structure and observation of excited \Xi^- Ξ − states in the \Xi_b^-\to J/\psi\Lambda K^- Ξ b − → J / ψ Λ K − decay and the study of B_s^0\to J/\psi\pi^+\pi^-K^+K^- B s 0 → J / ψ π + π − K + K − decays.