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Baryon decuplet in the chiral dynamics of Λ hyperons in nuclear matter

AuthorsMartín Cámalich, Jorge ; Vicente Vacas, Manuel J.
KeywordsSpin-orbit Interaction
Finite Nuclei
[PACS] Nuclear matter
[PACS] Hyperon–nucleon interactions (energy ≤ 10 GeV)
[PACS] Many-body theory of nuclei
Issue Date28-Mar-2007
PublisherAmerican Physical Society
CitationPhysical Review C 75: 035207 (2007)
AbstractWe study the long range part of the Λ-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 Λ-hyperon optical potential due to the long-range two-pion exchange, with Σ and Σ* baryons in the internal baryonic lines and considering Nh and Δh 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 Λ-nuclear spin-orbit interaction and show the importance of the Σ* and Δ degrees of freedom for the hyperon-nucleus interactions.
Description6 pages, 5 figures.-- PACS nrs.: 21.80.+a; 21.65.+f; 13.75.Ev; 24.10.Cn.-- ISI Article Identifier: 000245332200063.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0611082
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.75.035207
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