Kaon semileptonic decay form factors with HISQ valence quarks

Abstract

We report on the status of our kaon semileptonic form factor calculations using the highly-improved staggered quark (HISQ) formulation to simulate the valence fermions. We present results for the form factor f_+^{K π}(0) on the asqtad N_f=2+1 MILC configurations, discuss the chiral-continuum extrapolation, and give a preliminary estimate of the total error. We also present a more preliminary set of results for the same form factor but with the sea quarks also simulated with the HISQ action; these results include data at the physical light quark masses. The improvements that we expect to achieve with the use of the HISQ configurations and simulations at the physical quark masses are briefly discussed.

arXiv commentProceedings of Lattice 2012 International Symposium, 7 pages, 4 figures

References in corpus (6)

• An evaluation of |Vus| and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays
• Semileptonic decays of light quarks beyond the Standard Model
• K->pi form factors with reduced model dependence
• K -> pion Semileptonic Form Factors from Two-Flavor Lattice QCD
• Results from the MILC collaboration's SU(3) chiral perturbation theory analysis
• K -> pi l nu form factors with staggered quarks

Cited by in corpus (1)

• K semileptonic form factor with HISQ fermions at the physical point