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We present the first calculation of the kaon semileptonic form factor at zero momentum transfer in N f = 2+ 1 domain wall QCD with physical quark masses. We jointly analyze two sets of lattice simulations with different lattice spacings and large physical volumes. We obtain the continuum result f Kπ + (0) = 0.9685(34)statistical(14)systematic. Combining this calculation with data from experimental measurements of K → π decays, we predict the CKM matrix element |Vus|= 0.2233(5)experiment(9)lattice.

The Kaon Semileptonic Form Factor from Domain Wall QCD at the Physical Point