K semileptonic form factor with HISQ fermions at the physical point

E. Gámiz, A. Bazavov, C. Bernard +21

We present results for the form factor $f_{+}^{K\pi }(0)$, needed to extract the CKM matrix element $|V_{us}|$ from experimental data on semileptonic $K$ decays, on the HISQ $N_f=2+1+1…