Testing the hadro-quarkonium model on the lattice
  Recently the LHCb experiment found evidence for the existence of two exotic resonances consisting of $c\bar{c}uud$ quarks. Among the possible interpretations is the hadro-charmonium model, in which charmonium is bound "within" a light hadron. We test this idea on CLS $N_f$=2+1 lattices using the static formulation for the heavy quarks. We find that the static potential is modified by the presence of a hadron such that it becomes more attractive. The effect is of the order of a few MeV. 
Francesco Knechtli, Maurizio Alberti, Gunnar S. Bali, Sara Collins,   Graham Moir, Wolfgang S\"oldner
hep-lat hep-ph