Pole position of Λ(1405) measured in d(K−,n)πΣ reactions

Abstract. We measured πE invariant mass spectra below and above the K¯N mass threshold in the K−d → NπE reaction in order to study the K¯N interaction and the Λ(1405) resonance. This reaction can be described by the two-step process: (i) K¯N1 → K¯N followed by (ii) K¯N2 → πΣ, where N1 and N2 are nucleons bound in the deuteron. We deduced the S -wave scattering amplitude of K¯N →K¯N in the framework of the K¯N πΣ coupled channel so as to reproduce the observed πΣ spectra in the I = 0 channel. We found a resonance pole at 1417.7-7.4+6.0 (fitting error)-1.0+1.1 (systematic error) - i[26.9-7.9+6.0 (fitting error)-2.0+1.7 (systematic error)]MeV/c2.

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Nuclear medium effects on the properties of Λ(1405)

Süngü,

2024

J. Phys. G: Nucl. Part. Phys.

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We study the $\Lambda(1405)$ resonance with $I(J^{P})=0(1/2^{-}) $ in the context of the pentaquark hypothesis in the nuclear medium. To explore the influence of the nuclear medium on the physical parameters of $\Lambda(1405)$, we propose a molecular-type structure involving admixtures of $K^{-}p$ and $\bar{K}^{0}n$, correlated with the nuclear matter density. Our analysis reveals a substantial shift in mass and residue, approximately $20\%$ and $38\%$, respectively. These findings have significant implications for experimental researchers aiming to identify in-medium characteristics of hyperon resonances.

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Pole position of Λ(1405) measured in d(K−,n)πΣ reactions

Cited by 8 publications

References 61 publications

Light-quark mass dependence of the Λ(1405) resonance

Light-quark mass dependence of the Λ(1405) resonance

Measurement of KN scattering below the KN mass threshold

Nuclear medium effects on the properties of Λ(1405)

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