Semileptonic D->pi/K and B->pi/D decays in 2+1 flavor lattice QCD

Details Semileptonic D->pi/K and B->pi/D decays in 2+1 flavor lattice QCD Semileptonic D->pi/K and B->pi/D decays in 2+1 flavor lattice QCD

2004-09-18

arxiv.org/abs/hep-lat/0409116v1

Nucl.Phys.Proc.Suppl.140:461-463,2005

Physics

High Energy Physics

High Energy Physics - Lattice

Talk presented at Lattice2004(heavy); 3 pages, 3 figures

Scientific paper

10.1016/j.nuclphysbps.2004.11.15

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.

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