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Resonances in coupled πK-ηK scattering from quantum chromodynamics
Jozef J Dudek1, Robert G Edwards2, Christopher E Thomas3
1Theory Center, Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA and Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA.
Abstract:
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.
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