出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present a determination of the decay constants of the D and Ds mesons from lattice QCD, each
with a total error of about 2%, approximately a factor of three better than previous calculations.
We have been able to achieve this through the use of a highly improved discretization of QCD for
charm quarks, coupled to gauge congurations generated by the MILC collaboration that include
the full effect of sea u, d, and s quarks. We have results for a range of u/d masses down to ms/5
and three values of the lattice spacing, which allow us to perform accurate continuum and chiral
extrapolations. We x the charm quark mass to give the experimental value of the hc mass, and
then a stringent test of our approach is the fact that we obtain correct (and accurate) values for
the mass of the D and Ds mesons. We compare fD and fDs with fK and fp , and using experiment
determine corresponding CKM elements with good precision.
