The 43rd International Symposium on Lattice Field Theory (Lattice 2026)

$B_s \to K\ell\nu$ semileptonic form factors from lattice QCD with domain-wall heavy quarks

30 Jul 2026, 14:20

20m

Pyon Su (Adele H. Stamp Student Union)

Contributed talk Quark and lepton flavor physics Quark and lepton flavor physics

Speaker

Junya Tokoro (The University of Osaka)

Description

We report on our on-going study of the $B_s \to K\ell\nu$ semileptonic decays in $N_f = 2 + 1$ lattice QCD. Our simulations are carried out at a lattice cut-off $a^{-1} \sim 2.5$ GeV and a pion mass $M_\pi \sim 500$ MeV. The Mobius domain-wall action is employed for all quark flavors with bottom quark masses up to $m_b < 0.7 a^{-1}$ to control discretization errors. We present our preliminary results for relevant form factors, and discuss the systematic uncertainties associated with different treatments of excited state contribution.