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Progress on charm semileptonic form factors from 2+1 flavor lattice QCD

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arxiv 0912.0214 v1 pith:VRV5PF2B submitted 2009-12-01 hep-lat

Progress on charm semileptonic form factors from 2+1 flavor lattice QCD

Jon A. Bailey , A. Bazavov , C. Bernard , C. Bouchard , C. DeTar , A.X. El-Khadra , E.D. Freeland , W. Freeman
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E. Gamiz Steven Gottlieb U.M. Heller J.E. Hetrick A.S. Kronfeld J. Laiho L. Levkova P.B. Mackenzie M.B. Oktay M. Di Pierro J.N. Simone R. Sugar D. Toussaint R.S. Van de Water
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keywords charmfactorsformbottomsemileptonicasqtadcalculationsdecays
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Lattice calculations of the form factors for the charm semileptonic decays D to K l nu and D to pi l nu provide inputs to direct determinations of the CKM matrix elements |V(cs)| and |V(cd)| and can be designed to validate calculations of the form factors for the bottom semileptonic decays B to pi l nu and B to K l l-bar. We are using Fermilab charm (bottom) quarks and asqtad staggered light quarks on the 2+1 flavor asqtad MILC ensembles to calculate the charm (bottom) form factors. We outline improvements to the previous calculation of the charm form factors and detail our progress. We expect our current round of data production to allow us to reduce the theoretical uncertainties in |V(cs)| and |V(cd)| from 10.5% and 11%, respectively, to about 7%.

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