Observation of a new charged charmoniumlike state in B -> J/psi K pi   decays
  We present the results of an amplitude analysis of anti-B0 -> J/psi K- pi+ decays. A new charged charmoniumlike state Zc(4200)+ decaying to J/psi pi+ is observed with a significance of 6.2 sigma. The mass and width of the Zc(4200)+ are 4196 +31-29 +17-13 MeV/c^2 and 370 +70-70 +70-132 MeV, respectively; the preferred assignment of the quantum numbers is J^P = 1^+. In addition, we find evidence for Zc(4430)+ -> J/psi pi+. The analysis is based on a 711 fb^-1 data sample collected by the Belle detector at the asymmetric-energy e+ e- collider KEKB. 
Belle Collaboration: K. Chilikin, R. Mizuk, I. Adachi, H. Aihara, S.   Al Said, K. Arinstein, D. M. Asner, V. Aulchenko, T. ...
hep-ex