Isoscalar meson spectroscopy from lattice QCD
  We extract to high statistical precision an excited spectrum of single-particle isoscalar mesons using lattice QCD, including states of high spin and, for the first time, light exotic JPC isoscalars. The use of a novel quark field construction has enabled us to overcome the long-standing challenge of efficiently including quark-annihilation contributions. Hidden-flavor mixing angles are extracted and while most states are found to be close to ideally flavor mixed, there are examples of large mixing in the pseudoscalar and axial sectors in line with experiment. The exotic JPC isoscalar states appear at a mass scale comparable to the exotic isovector states. 
Jozef J. Dudek, Robert G. Edwards, Balint Joo, Michael J. Peardon,   David G. Richards and Christopher E. Thomas
hep-lat hep-ph