Static hybrid quarkonium potential with improved staggered quarks
  We are studying the effects of light dynamical quarks on the excitation energies of a flux tube between a static quark and antiquark. We report preliminary results of an analysis of the ground state potential and the $\Sigma^{\prime+}_g$ and $\Pi_u$ potentials. We have measured these potentials on closely matched ensembles of gauge configurations, generated in the quenched approximation and with 2+1 flavors of Asqtad improved staggered quarks. 
MILC Collaboration: C. Bernard (Washington U), T. Burch (U Arizona),   C.E. DeTar (U Utah), Ziwen Fu (U Utah), Steven Gottli...