The baryon-decuplet in the chiral dynamics of Lambda-hyperons in nuclear matter

Abstract

We study the long range part of the $\Lambda$-hyperon optical potential in nuclei using Quantum Many Body techniques and flavor-SU(3) Chiral Lagrangians as starting point. More precisely, we study the contributions to the $\Lambda$-hyperon optical potential due to the long-range two-pion exchange, with $\Sigma$ and ${\Sigma }^{\ast }$ baryons in the internal baryonic lines and considering Nh and $\Delta$h excitations. We also consider the contribution to the spin-orbit potentials that comes out from these terms. Our results support a natural explanation of the smallness of the $\Lambda$-nuclear spin-orbit interaction and shows the importance of the ${\Sigma }^{\ast }$ and $\Delta$ degrees of freedom for the hyperon-nucleus interactions.

8 pages, 5 figures

References in corpus (16)

• Non perturbative chiral approach to s-wave \bar{K}N interactions
• Soft-core hyperon-nucleon potentials
• The Juelich hyperon-nucleon model revisited
• Chiral Dynamics and Nuclear Matter
• Strong and Electromagnetic Decays of the Baryon Decuplet
• The quark-meson coupling model for Lambda, Sigma and Xi hypernuclei
• Chiral approach to nuclear matter: Role of two-pion exchange with virtual delta-isobar excitation
• Chiral approach to antikaon s- and p-wave interactions in dense nuclear matter
• A critical analysis on deeply bound kaonic states in nuclei
• Hyperon properties in finite nuclei using realistic $YN$ interactions
• Nuclear mean field from chiral pion-nucleon dynamics
• Radiative decay of the Lambda(1520)
• Chiral SU(3) dynamics and $\Lambda$-hyperons in the nuclear medium
• Single-Particle Spin-Orbit Strengths of the Nucleon and Hyperons by SU6 Quark-Model
• Chiral dynamics of $\Sigma$-hyperons in the nuclear medium
• Nuclear spin-orbit interaction from chiral pion-nucleon dynamics

Cited by in corpus (4)

• A study of hyperons in nuclear matter based on chiral effective field theory
• Hypernuclear single particle spectra based on in-medium chiral SU(3) dynamics
• In-medium chiral SU(3) dynamics and hypernuclear structure
• $\Sigma$-nuclear spin-orbit coupling from two-pion exchange