Kaon semileptonic decay form factors with HISQ valence quarks

TL;DR

This paper reports on calculations of kaon semileptonic form factors using the HISQ quark formulation, aiming to improve precision and reduce errors in theoretical predictions relevant to particle physics.

Contribution

It presents new results for the form factor f_+^{K o \pi}(0) using HISQ valence and sea quarks, including physical quark mass data, and discusses the associated error estimates.

Findings

Results for f_+^{K o \\pi}(0) on MILC configurations

Preliminary estimates of total errors

Potential improvements with physical quark mass simulations

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 \pi}(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.