$Σ$-nuclear spin-orbit coupling from two-pion exchange
| dc.creator | Kaiser, N. | |
| dc.date | 2007-11-14 | |
| dc.date.accessioned | 2026-07-07T11:13:11Z | |
| dc.date.available | 2026-07-07T11:13:11Z | |
| dc.description | Using SU(3) chiral perturbation theory we calculate the density-dependent complex-valued spin-orbit coupling strength $U_{Σls}(k_f)+ i W_{Σls}(k_f)$ of a $Σ$ hyperon in the nuclear medium. The leading long-range $ΣN$ interaction arises from iterated one-pion exchange with a $Λ$ or a $Σ$ hyperon in the intermediate state. We find from this unique long-range dynamics a sizeable ``wrong-sign'' spin-orbit coupling strength of $U_{Σls}(k_{f0}) \simeq -20$ MeVfm$^2$ at normal nuclear matter density $ρ_0 = 0.16 $fm$^{-3}$. The strong $ΣN\to ΛN$ conversion process contributes at the same time an imaginary part of $W_{Σls}(k_{f0}) \simeq -12$ MeVfm$^2$. When combined with estimates of the short-range contribution the total $Σ$-nuclear spin-orbit coupling becomes rather weak. | |
| dc.description | 7 pages, 2 figures, submitted to Phys. Rev. C | |
| dc.identifier | https://arxiv.org/abs/0711.2237 | |
| dc.identifier | http://arxiv.org/abs/0711.2237 | |
| dc.identifier | Phys.Rev.C76:068201,2007 | |
| dc.identifier | doi:10.1103/PhysRevC.76.068201 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/191631 | |
| dc.subject | Nuclear Theory | |
| dc.title | $Σ$-nuclear spin-orbit coupling from two-pion exchange | |
| dc.type | text |