Abstract
We present the first calculation of coupled-channel meson-meson scattering in the isospin , -parity negative sector, with channels , and , in a first-principles approach to QCD. From the discrete spectrum of eigenstates in three volumes extracted from lattice QCD correlation functions we determine the energy dependence of the -matrix, and find that the -wave features a prominent cusplike structure in close to the threshold coupled with a rapid turn-on of amplitudes leading to the final state. This behavior is traced to an -like resonance, strongly coupled to both and , which is identified with a pole in the complex energy plane, appearing on only a single unphysical Riemann sheet. Consideration of -wave scattering suggests a narrow tensor resonance at higher energy.
19 More- Received 22 February 2016
DOI:https://doi.org/10.1103/PhysRevD.93.094506
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