Resonances in coupled πK-ηK scattering from quantum chromodynamics.
Using a first-principles calculation within quantum chromodynamics, we are able to determine a pattern of strangeness=1 resonances that appear as complex singularities within coupled πK-ηK scattering amplitudes. We make use of numerical computation in the lattice discretized approach to the quantum field theory with light quark masses corresponding to m(π)∼400  MeV and at a single lattice spacing. The energy dependence of scattering amplitudes is extracted through their relationship to the discrete spectrum in a finite volume, which we map out in unprecedented detail.
Theory Center, Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA and Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA.
Jozef J
JJ
Dudek
Theory Center, Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA.
Robert G
RG
Edwards
DAMTP, University of Cambridge, Cambridge CB3 0WA, United Kingdom.
Christopher E
CE
Thomas
Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA.
David J
DJ
Wilson