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%.
@article{arxiv.0912.0214,
title = {Progress on charm semileptonic form factors from 2+1 flavor lattice QCD},
author = {Jon A. Bailey and A. Bazavov and C. Bernard and C. Bouchard and C. DeTar and A. X. El-Khadra and E. D. Freeland and W. Freeman and E. Gamiz and Steven Gottlieb and U. M. Heller and J. E. Hetrick and A. S. Kronfeld and J. Laiho and L. Levkova and P. B. Mackenzie and M. B. Oktay and M. Di Pierro and J. N. Simone and R. Sugar and D. Toussaint and R. S. Van de Water},
journal= {arXiv preprint arXiv:0912.0214},
year = {2010}
}
Comments
7 pages, 2 figures, parallel talk at 27th International Symposium on Lattice Field Theory (Lattice 2009), Beijing, China, 25-31 Jul 2009; typos corrected