Speaker
Dr
Ruizi Li
(Indiana University)
Description
We calculate $D \rightarrow Kl\nu, \pi l\nu$ vector form factors $f_+^{K/\pi}$ at zero-momentum transfer, using MILC's $N_f = 2+1+1$ HISQ ensembles at four lattice spacings, $a \approx 0.042, 0.06, 0.09, 0.12$ fm, and various HISQ quark masses down to the (degenerate) physical light quark mass. We use the kinematic constraint $f_+= f_0$ at $q^2 = 0$ to determine the vector form factor from our study of the scalar current which yields $f_0$. We use hard pion/kaon SU(3) heavy-meson-staggered $\chi$PT and Symanzik effective theory to fit the data and extrapolate the form factors to the physical point. We improve the precision achieved in existing lattice calculations of the vector form factors at $q^2=0$. We also determine the CKM matrix elements $|V_{cs}|$, $|V_{cd}|$ using recent experimental results and test second row unitarity.
Primary author
Dr
Ruizi Li
(Indiana University)
Co-authors
Prof.
Aida El-Khadra
(University of Illinois at Urbana-Champaign)
Dr
Andreas Kronfeld
(Fermilab)
Carleton DeTar
(University of Utah)
Prof.
Claude Bernard
(Washington University)
Prof.
Doug Toussaint
(University of Arizona)
Dr
Elvira Gamiz
(University of Granada)
Dr
Ruth Van de Water
(Fermilab)
Steven Gottlieb
(Indiana Univ.)