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An $a_0$ resonance in strongly coupled $\pi \eta$, $K \overline{K}$ scattering from lattice QCD

J. Dudek

in 34th annual International Symposium on Lattice Field Theory

Contribution: pdf


Scattering amplitudes for the coupled-channels πη, KK and πη′ in isospin = 1 are extracted from the discrete spectrum of eigenstates in three volumes determined using lattice QCD with mπ = 391 MeV. The S-wave is found to feature a prominent cusp-like structure in πη → πη close to KK threshold, and an a0(980)-like resonance is identified, corresponding to a pole in the complex energy plane, coupled to both πη and KK.