K --textgreater pi lepton neutrino

Determination of $textbarV_ustextbar$ from a Lattice-QCD Calculation of the $Ktopiellnu$ Semileptonic Form Factor with Physical Quark Masses

We calculate the kaon semileptonic form factor $f_+(0)$ from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC collaboration with $N_f=2+1+1$ flavors of sea quarks, which …