Low-lying baryon resonances from lattice QCD
ORAL
Abstract
Recent results studying the masses and widths of low-lying baryon resonances in lattice QCD are presented. The s-wave scattering lengths with both total isospins I=1/2 and I=3/2 are inferred from the finite-volume spectrum below the inelastic threshold together with the I=3/2 p-wave containing the Δ(1232) resonance. A lattice QCD computation employing a combined basis of three-quark and meson-baryon interpolating operators with definite momentum to determine the coupled channel Σπ−NK scattering amplitude in the Λ(1405) region is also presented. Our results support the picture of a two-pole structure suggested by theoretical approaches based on SU(3) chiral symmetry and unitarity.
*Computations were carried out on Frontera at the Texas Advanced Computing Center (TACC), and at the National Energy Research Scientific Computing Center (NERSC). The author acknowledges support from the U.S. NSF under award PHY-1913158 and PHY-2209167.
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Publication: (1) Bulava et al., Elastic nucleon-pion scattering at mπ = 200 MeV from lattice QCD, Nucl.Phys.B 987 (2023).
(2) Bulava et al., The two-pole nature of the Λ(1405) from lattice QCD, submitted to PRL.
Presenters
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Andre P Walker-Loud
- Lawrence Berkeley National Laboratory