Naslov
In-medium chiral SU(3) dynamics and hypernuclear structure

Autori
Finelli, Paolo ; Kaiser, Norbert ; Vretenar, Dario ; Weise, Wolfram

Izvornik
Physics Letters B (0370-2693) 658 (2007), 1-3; 90-94

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Chiral dynamics; Hypernuclei; QCD sum rules; Density functional theory

Sažetak
A previously introduced relativistic energy density functional, successfully applied to ordinary nuclei, is extended to hypernuclei. The density-dependent mean field and the spin– orbit potential are consistently calculated for a Λ hyperon in the nucleus using the SU(3) extension of in-medium chiral perturbation theory. The leading long range Λ N interaction arises from kaon-exchange and 2π -exchange with Σ hyperon in the intermediate state. Scalar and vector mean fields reflecting in-medium changes of the quark condensates are constrained by QCD sum rules. The model, applied to oxygen as a test case, describes spectroscopic data in good agreement with experiment. In particular, the smallness of the Λ spin– orbit interaction finds a natural explanation in terms of an almost complete cancellation between scalar– vector background contributions and long-range terms generated by two-pion exchange.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA