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Lattice QCD studies of the Delta baryon resonance and the K₀^ast(700) and a₀(980) meson resonances: the role of exotic operators in determining the finite-volume spectrum

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arxiv 2312.10184 v1 pith:FVMMNWIQ submitted 2023-12-15 hep-lat nucl-th

Lattice QCD studies of the Delta baryon resonance and the K₀^ast(700) and a₀(980) meson resonances: the role of exotic operators in determining the finite-volume spectrum

classification hep-lat nucl-th
keywords deltalatticeresonancebaryonfinite-volumemesonoperatorsresonances
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Studies of the $\Delta$ baryon resonance and the $K_0^\ast(700)$ and $a_0(980)$ meson resonances using $N_f=2+1$ lattice QCD for pion masses near 200 MeV are presented. The $s$-wave scattering lengths for both the $I=1/2$ $N \pi$ and $I=3/2$ $N \pi$ channels and properties of the $\Delta$ resonance are identified from the finite-volume energy levels of the lattice simulation. The importance of a three-quark $\Delta$-operator in the $N\pi$ system and tetraquark operators in the mesonic systems is investigated.

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