Speaker
Description
We present our results for the kaon semileptonic form factors calculated
by using the $N_f=2+1$ and $2+1+1$ PACS10 configuration, whose physical volumes
are more than $($10 fm$)^4$ at the physical quark masses in the lattice spacings
from 0.04 to 0.08 fm. The configurations were generated using the Iwasaki
gauge action and stout-smeared clover quark action. The form factors near
zero momentum transfer can be calculated thanks to the large volume.
Using our data, a stable interpolation of the form factors to zero momentum
transfer is carried out. The value of $|V_{us}|$ is determined using
the interpolated result of the form factors at zero momentum transfer.
Our value of $|V_{us}|$ is compared with a prediction of the standard model
estimated from the CKM matrix unitarity and with those determined using
the previous lattice results.