Kaon and D meson semileptonic form factors from lattice QCD

Abstract

We present the status of on-going calculations of the $K\to \pi l\nu$ and $D\to K(\pi )l\nu$ semileptonic form factors at $q^2=0$. These form factors are important for the determination of the CKM matrix elements $|V_{us}|$ and $|V_{cs(d)}|$ respectively. This work uses the HISQ action for both valence quarks and sea quarks on MILC $N_f=2+1+1$ configurations. We employ twisted boundary conditions to calculate the form factors at zero momentum transfer directly. The $K\to \pi$ results are an update to previously published results with new data at the physical point. The $D\to K(\pi )$ results are preliminary.

References in corpus (1)

• Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks

Cited by in corpus (1)

• Testing the Standard Model under the weight of heavy flavors