出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The measured partial widths of the semileptonic decays D!K`n and D!p`n can be combined with the form factors calculated on the lattice to extract the CKM matrix elements jVcsj and jVcd j. The lattice calculations can be checked by comparing the form factor shapes from the lattice and experiment. We have generated a sizable data set by using heavy clover quarks with the Fermilab interpretation for charm and asqtad staggered light quarks on 2+1 flavor MILC ensembles with lattice spacings of approximately 0:12, 0:09, 0:06, and 0:045 fm. Preliminary fits to staggered chiral perturbation theory suggest that we can reduce the uncertainties in the form factors at q2 = 0 to below 5%.
