Form factors for $B$ to $Kll$ semileptonic decay from three-flavor   lattice QCD
  We study the $B \to Kl^+l^-$ semileptonic decay process in three-flavor lattice QCD. We analyze several ensembles generated by the MILC collaboration at different lattice spacings and sea-quark masses. We use the asqtad improved staggered action for the light quarks and the clover action with the Fermilab interpretation for the heavy $b$ quark. We present preliminary results for the vector current induced form factors for a range of kaon energies. Our analysis includes chiral and continuum extrapolations based on SU(2) staggered \chi PT. 
Ran Zhou, Jon A. Bailey, Alexei Bazavov, Aida X. El-Khadra, Steven   Gottlieb, Rajendra D. Jain, Andreas S. Kronfeld, Ruth S...
hep-lat hep-ex hep-ph