Semileptonic decays of K and D mesons in 2+1 flavor QCD

Details Semileptonic decays of K and D mesons in 2+1 flavor QCD Semileptonic decays of K and D mesons in 2+1 flavor QCD

2010-11-10

arxiv.org/abs/1011.2423v1

PoS Lattice2010:306,2010

Physics

High Energy Physics

High Energy Physics - Lattice

8 pp., 5 figs, presented at Lattice 2010, June 14-19, 2010, Villasimius, Italy

Scientific paper

The experimentally measured rates of the semileptonic decays K -> pi l nu and D -> 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. Analysis of data for the D -> pi l nu form factor provides a nontrivial test of our methods via comparison with CLEO data. We discuss the use of HISQ valence quarks to calculate the K -> pi l nu form factor f_+^{K pi}(0) and describe tests of our method.

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