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 (78)

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• Two-pole structures in QCD: Facts, not fantasy!
• Coupled-channel effects in hadron-hadron correlation functions
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• Structure of near-threshold quasi-bound states
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• Interactions between vector mesons and dynamically generated resonances
• The pole structure of the Lambda(1405) in a recent QCD simulation
• Generalized weak-binding relations of compositeness in effective field theory
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• S- and p-wave structure of $S=-1$ meson-baryon scattering in the resonance region
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• New insights into the pole parameters of the $\Lambda (1380)$, the $\Lambda (1405)$ and the $\Sigma (1385)$
• Double-pole nature of $\Lambda (1405)$ studied with coupled-channel complex scaling method using complex-range Gaussian basis
• Renormalization of Unitarized Weinberg-Tomozawa Interaction without On-shell Factorization and $I=0$ $\bar{K}N$ - $\pi \Sigma$ Coupled Channels
• Topics in Low-Energy QCD with Strange Quarks
• The negative-parity spin-1/2 $\Lambda$ baryon spectrum from lattice QCD and effective theory
• $\sigma$ exchange in the one-boson exchange model involving the ground state octet baryons
• Pion axioproduction: The Delta resonance contribution
• Structure of hadron resonances with a nearby zero of the amplitude
• $J/\psi N$ interactions revisited and ${\Lambda }_b^0\to J/\psi K^{-}({\pi }^{-})p$ decays
• Faddeev approach to the reaction $K^{-}d\to \pi \Sigma n$ at $p_K=1$ GeV/c
• Pole trajectories of the $\Lambda (1405)$ helps establish its dynamical nature
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• Is two-poles' $\Lambda (1405)$ one state or two?
• Recent developments in antikaon-nucleon dynamics
• The Lambda(1405) state in a chiral unitary approach with off-shell corrections to dimensional regularized loop functions
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• SU(3) flavor symmetry considerations for the $\bar{K}N$ coupled channels system
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