Stringy excitation and role of UV gluons in lattice QCD
  Using SU(3) quenched lattice QCD, we study ground-state and low-lying even-parity excited-state potentials of quark-antiquark systems in terms of the gluon-momentum component in the Coulomb gauge. By introducing UV-cut in the gluon-momentum space, we investigate the "UV-gluon sensitivity" of the ground-state and excited-state potentials and the stringy excitation quantitatively. Even after cutting off high-momentum gluon component above 1.5GeV, the IR part of the ground-state potential is almost unchanged. On the other hand, the change of excited-state potential is more significant by the cut of UV-gluons. However, even after the removal of UV-gluons, the magnitude of the low-lying gluonic excitation remains to be of the order of 1GeV. 
Hiroshi Ueda, Takahiro M. Doi, Sho Fujibayashi, Shoichiro Tsutsui,   Takumi Iritani, Hideo Suganuma (Department of Physics, ...
hep-lat hep-ph hep-th nucl-th