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We present a lattice-QCD determination of the elastic isospin-$1/2$ $S$-waveand $P$-wave $K\pi$ scattering amplitudes as a function of the center-of-massenergy using L\"uscher's method. We perform global fits of $K$-matrixparametrizations to the finite-volume energy spectra for all irreduciblerepresentations with total momenta up to $\sqrt{3}\frac{2\pi}{L}$; thisincludes irreps that mix the $S$- and $P$-waves. Several differentparametrizations for the energy dependence of the $K$-matrix are considered. Wealso determine the positions of the nearest poles in the scattering amplitudes,which correspond to the broad $\kappa$ resonance in the $S$-wave and the narrow$K^*(892)$ resonance in the $P$-wave. Our calculations are performed with $2+1$dynamical clover fermions for two different pion masses of $317.2(2.2)$ and$175.9(1.8)$ MeV. Our preferred $S$-wave parametrization is based on aconformal map and includes an Adler zero; for the $P$-wave we use a standardpole parametrization including Blatt-Weisskopf barrier factors. The $S$-wave$\kappa$-resonance pole positions are found to be $\left[0.86(12) -0.309(50)\,i\right]\:{\rm GeV}$ at the heavier pion mass and $\left[0.499(55)-0.379(66)\,i\right]\:{\rm GeV}$ at the lighter pion mass. The $P$-wave$K^*$-resonance pole positions are found to be $\left[ 0.8951(64) -0.00250(21)\,i \right]\:{\rm GeV}$ at the heavier pion mass and$\left[0.8718(82) - 0.0130(11)\,i\right]\:{\rm GeV}$ at the lighter pion mass,which corresponds to couplings of $g_{K^* K\pi}=5.02(26)$ and $g_{K^*K\pi}=4.99(22)$, respectively.

$I=1/2$ $S$-wave and $P$-wave $K\pi$ scattering and the $\kappa$ and $K^*$ resonances from lattice QCD