K -> pi l nu form factors with staggered quarks

2011/11/08 by E. Gámiz, Gamiz, E., A. X. El-Khadra +8
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1111.2021

openalex publication_date 2011/11/08 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We report on the status of the Fermilab-MILC calculation of the form factor f₊^{K pi}(0), needed to extract the CKM matrix element |V_us| from experimental data on K semileptonic decays. The HISQ formulation is used in the simulations for the valence quarks, while the sea quarks are simulated with the asqtad action (MILC N_f=2+1 configurations). We discuss the general methodology of the calculation, including the use of twisted boundary conditions to get values of the momentum transfer close to zero and the different techniques applied for the correlators fits. We present initial results for lattice spacings a=0.12fm and a=0.09fm, and several choices of the light quark masses.

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