New insights into antikaon-nucleon scattering and the structure of the Lambda(1405)

Abstract

We perform a combined analysis of antikaon-nucleon scattering cross sections and the recent SIDDHARTA kaonic hydrogen data in the framework of a coupled-channel Bethe-Salpeter approach at next-to-leading order in the chiral expansion of the effective potential. We find a precise description of the antikaon-proton scattering amplitudes and are able to extract accurate values of the scattering lengths, a0=-1.81^+0.30_-0.28 + i 0.92^+0.29_-0.23 fm, a1=+0.48^+0.12_-0.11 + i 0.87^+0.26_-0.20 fm. We also discuss the two-pole structure of the Lambda(1405).

7 pages, 4 figures

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Cited by in corpus (14)

• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Constraints on the chiral unitary $\bar{K}N$ amplitude from $\pi \Sigma K^{+}$ photoproduction data
• Predictions for the ${\Lambda }_b\to J/\psi \Lambda (1405)$ decay
• Structure of the $\mathbf{\Lambda }(1405)$ from Hamiltonian effective field theory
• Deuteron-like states composed of two doubly charmed baryons
• Generalized weak-binding relations of compositeness in effective field theory
• Faddeev-Chiral Unitary Approach to the $K^{-}d$ scattering length
• Recoil corrections in antikaon-deuteron scattering
• Double-pole nature of $\Lambda (1405)$ studied with coupled-channel complex scaling method using complex-range Gaussian basis
• Topics in Low-Energy QCD with Strange Quarks
• $J/\psi N$ interactions revisited and ${\Lambda }_b^0\to J/\psi K^{-}({\pi }^{-})p$ decays
• Recent developments in antikaon-nucleon dynamics
• Studying the bound state of the $K^{-}p$ system in the Bethe-Salpeter formalism
• Calculations of kaonic nuclei based on chiral meson-baryon coupled channel interaction models