%0 Journal Article
%T Semileptonic D->pi/K and B->pi/D decays in 2+1 flavor lattice QCD
%A M. Okamoto
%A C. Aubin
%A C. Bernard
%A C. DeTar
%A M. Di Pierro
%A A. X. El-Khadra
%A Steven Gottlieb
%A E. B. Gregory
%A U. M. Heller
%A J. Hetrick
%A A. S. Kronfeld
%A P. B. Mackenzie
%A D. P. Menscher
%A M. Nobes
%A M. B. Oktay
%A J. Osborn
%A J. N. Simone
%A R. Sugar
%A D. Toussaint
%A H. D. Trottier
%J Physics
%D 2004
%I arXiv
%R 10.1016/j.nuclphysbps.2004.11.151
%X We present results for form factors of semileptonic decays of $D$ and $B$ mesons in 2+1 flavor lattice QCD using the MILC gauge configurations. With an improved staggered action for light quarks, we successfully reduce the systematic error from the chiral extrapolation. The results for $D$ decays are in agreement with experimental ones. The results for B decays are preliminary. Combining our results with experimental branching ratios, we then obtain the CKM matrix elements $|V_{cd}|$, $|V_{cs}|$, $|V_{cb}|$ and $|V_{ub}|$. We also check CKM unitarity, for the first time, using only lattice QCD as the theoretical input.
%U http://arxiv.org/abs/hep-lat/0409116v1