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Coupled-channel $pi K$ and $eta K$ scattering amplitudes are determined by studying the finite-volume energy spectra obtained from dynamical lattice QCD calculations. Using a large basis of interpolating operators, including both those resembling a $qbar{q}$ construction and those resembling a pair of mesons with relative momentum, a reliable excited-state spectrum can be obtained. Working at ${m_pi=391,mathrm{MeV}}$, we find a gradual increase in the $J^P=0^+$ $pi K$ phase-shift which may be identified with a broad scalar resonance that couples strongly to $pi K$ and weakly to $eta K$. The low-energy behavior of this amplitude suggests a virtual bound-state that may be related to the $kappa$ resonance. A bound state with $J^P=1^-$ is found very close to the $pi K$ threshold energy, whose coupling to the $pi K$ channel is compatible with that of the experimental $K^star(892)$. Evidence is found for a narrow resonance in $J^P=2^+$. Isospin--3/2 $pi K$ scattering is also studied and non-resonant phase-shifts spanning the whole elastic scattering region are obtained.
We present the first calculation of coupled-channel meson-meson scattering in the isospin $=1$, $G$-parity negative sector, with channels $pi eta$, $Koverline{K}$ and $pi eta$, in a first-principles approach to QCD. From the discrete spectrum of eige
We determine elastic and coupled-channel amplitudes for isospin-1 meson-meson scattering in $P$-wave, by calculating correlation functions using lattice QCD with light quark masses such that $m_pi = 236$ MeV in a cubic volume of $sim (4 ,mathrm{fm})^
We present a determination of the mass, width and coupling of the strange resonances appearing in pion-kaon scattering below 1.8 GeV, namely the much debated $K^*_0(800)$ or $kappa$, the scalar $K^*_0(1430)$, the $K^*(892)$ and $K^*(1410)$ vectors, t
A calculation of the ratio of leptonic decay constants f_{K^+}/f_{pi^+} makes possible a precise determination of the ratio of CKM matrix elements |V_{us}|/|V_{ud}| in the Standard Model, and places a stringent constraint on the scale of new physics
A partial wave analysis of antiproton-proton annihilation data in flight at 900 $MeV/c$ into $pi^0 pi^0 eta$ , $pi^0 eta eta$ and $K^+ K^- pi^0$ is presented. The data were taken at LEAR by the Crystal Barrel experiment in 1996. The three channels ha