The finite volume spectrum of excited states from lattice QCD   simulations
  We present results for the spectrum of excited mesons obtained from temporal correlations of spatially-extended single-hadron and multi-hadron operators computed in lattice QCD. The stochastic LapH algorithm is implemented on anisotropic, dynamical lattices for isovectors for pions of mass $390$ MeV. A large correlation matrix with single-particle and two-particle probe operators is diagonalized to identify resonances. The masses of excited states in the $I=1, S=0, T_{1u}^+$ channel as well as the mixing of single and multi-particle probe operators are presented. 
John Bulava, Brendan Fahy, You-Cyuan Jhang, David Lenkner, Colin J.   Morningstar, Justin Foley, Keisuke J. Juge, Chik Him Wong
hep-lat