Speaker
Elvira Gamiz
(Fermilab)
Description
The experimentally measured rates of the semileptonic decays K to pi l nu and D to K(pi) l nu can be combined with lattice calculations of the associated form factors to precisely extract the CKM matrix elements |V_{us}| and |V_{cs(d)}|. We report on the status of form factor calculations with Fermilab charm quarks and staggered light quarks on the 2+1 flavor asqtad staggered MILC ensembles. Analyses of the data for the charm decays indicate significant improvements in the statistical uncertainties. We discuss the use of hisq valence quarks to calculate the K to pi l nu form factor f_+(0) and describe tests of our method.
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Primary author
Elvira Gamiz
(Fermilab)
Co-authors
Aida El-Khadra
(U. of Illinois)
Alexei Bazavov
(U. of Arizona)
Andreas Kronfeld
(Fermilab)
Carleton DeTar
(U. of Utah)
Christopher Bouchard
(U. of Illinois)
Claude Bernard
(Washington U.)
Doug Toussaint
(U. of Arizona)
Elizabeth Freeland
(Washington U.)
Elvira Gamiz
(Fermilab)
James Hetrick
(U. of the Pacific)
James Simone
(Fermilab)
John Laiho
(U. of Glasgow)
Jon Bailey
(Fermliab)
Ludmila Levkova
(U. of Utah)
Mehmet Oktay
(U. of Utah)
Paul Mackenzie
(Fermilab)
Robert Sugar
(U.C. Santa Barbara)
Ruth Van de Water
(Brookhaven Natl. Lab.)
Steven Gottlieb
(Indiana U.)
Urs Heller
(American Physical Society)
