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An a$_{0}$ resonance in strongly coupled πη, K$\bar K$ scattering from lattice QCD
(American Physical SocietyPhysical Review D, 2016-05-11)
We present the first calculation of coupled-channel meson-meson scattering in the isospin =1, G-parity negative sector, with channels πη, K$\bar K$ and πη′, in a first-principles approach to QCD. From the discrete spectrum ...
ππ→πγ$^{∗}$ amplitude and the resonant ρ→πγ$^{∗}$ transition from lattice QCD
(American Physical SocietyPhysical Review D, 2016-06-10)
We present a determination of the P-wave ππ→πγ$^{⋆}$ transition amplitude from lattice quantum chromodynamics. Matrix elements of the vector current in a finite volume are extracted from three-point correlation functions, ...