Charmonium and Charmonium-like states observed at Belle

초록

We report a resonance-like structure observed in the pi+ psi` invariant mass distribution near 4.43 GeV in B -> K pi+ psi` decays from 605 fb-1 data sample that contains 657 million BBbar paris collected with the Belle detector at the KEKB asymmetric energy e+e- collider.