The pole structure of the Lambda(1405) in a recent QCD simulation

Abstract

The $\Lambda (1405)$ baryon is difficult to detect in experiment, absent in many quark model calculations, and supposedly manifested through a two-pole structure. Its uncommon properties made it subject to numerous experimental and theoretical studies in recent years. Lattice-QCD eigenvalues for different quark masses were recently reported by the Adelaide group. We compare these eigenvalues to predictions of a model based on Unitary Chiral Perturbation Theory. The UCHPT calculation predicts the quark mass dependence remarkably well. It also explains the overlap pattern with different meson-baryon components, mainly $\pi \Sigma$ and $\bar{K}N$, at different quark masses. More accurate lattice QCD data are required to draw definite conclusions on the nature of the $\Lambda (1405)$.

14 pages, 4 figures

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Cited by in corpus (27)

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• QCD and the Strange Baryon Spectrum
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• Structure of the Roper Resonance from Lattice QCD Constraints
• Hyperon II: Properties of excited hyperons
• Cross-channel constraints on resonant antikaon-nucleon scattering
• Two-pole nature of the $\Lambda (1405)$ from lattice QCD
• Hyperon resonances coupled to pseudoscalar- and vector-baryon channels
• Construction of a local barK N-pi Sigma-pi Lambda potential and composition of the Lambda(1405)
• Light-quark contributions to the magnetic form factor of the Lambda(1405)
• S- and p-wave structure of $S=-1$ meson-baryon scattering in the resonance region
• The role of the triangle singularity in $\Lambda (1405)$ production in the ${\pi }^{-}p\to K^0\pi \Sigma$ and $pp\to p{K}^{+}\pi \Sigma$ processes
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