We present our results of the Kl3 form factors on the volume whose spatial extent is more than L=10 fm, with the physical pion and kaon masses using the stout-smearing clover Nf=2+1 quark action and Iwasaki gauge action at a−1≈2.3 GeV. The Kl3 form factor at zero momentum transfer is obtained from fit based on the next-to-leading (NLO) formula in SU(3) chiral perturbation theory. We estimate systematic errors of the form factor, mainly coming from the finite lattice spacing effect. We also determine the value of ∣Vus∣ by combining our result with the experiment and check the consistency with the standard model prediction. The result is compared with the previous lattice calculations.
@article{arxiv.2002.01684,
title = {$K_{l3}$ form factors in $N_f = 2+1$ QCD at physical point on large volume},
author = {Junpei Kakazu and Ken-ichi Ishikawa and Naruhito Ishizuka and Yoshinobu Kuramashi and Yoshifumi Nakamura and Yusuke Namekawa and Yusuke Taniguchi and Naoya Ukita and Takeshi Yamazaki and Tomoteru Yoshié},
journal= {arXiv preprint arXiv:2002.01684},
year = {2020}
}
Comments
7 pages, 5 figures, Talk presented at the 37th International Symposium on Lattice Field Theory (Lattice2019), 16-22 June 2019, Wuhan, China