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Title

Strangeness and charm in nuclear matter

AuthorsTolós, Laura; Cabrera Urbán, Daniel; García Recio, Carmen; Molina, Raquel ; Nieves, Juan Miguel ; Oset, Eulogi ; Ramos, Àngels; Romanets, Olena; Salcedo, Lorenzo Luis
KeywordsStrange mesons
Transparency ratio
Dynamically-generated baryon resonances
Open charm in matter
D-mesic nuclei
Issue Date20-Sep-2013
PublisherElsevier
CitationNuclear Physics - Section A 914: 461-471 (2013)
AbstractThe properties of strange (K, (K) over bar and (K) over bar*) and open-charm (D, (D) over bar and D*) mesons in dense matter are studied using a unitary approach in coupled channels for meson-baryon scattering. In the strangeness sector, the interaction with nucleons always comes through vector-meson exchange, which is evaluated by chiral and hidden gauge Lagrangians. For the interaction of charmed mesons with nucleons we extend the SU(3) Weinberg-Tomozawa Lagrangian to incorporate spin-flavor symmetry and implement a suitable flavor symmetry breaking. The in-medium solution for the scattering amplitude accounts for Pauli blocking effects and meson self-energies. On one hand, we obtain the K, (K) over bar and (K) over bar* spectral functions in the nuclear medium and study their behaviour at finite density, temperature and momentum. We also make an estimate of the transparency ratio of the gamma A -> K+ K*(-) A' reaction, which we propose as a tool to detect in-medium modifications of the (K) over bar* meson. On the other hand, in the charm sector, several resonances with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with 1/2(+) and 3/2(+) baryons. The properties of these states in matter are analyzed and their influence on the open-charm meson spectral functions is studied. We finally discuss the possible formation of D-mesic nuclei at FAIR energies.
Publisher version (URL)http://dx.doi.org/10.1016/j.nuclphysa.2013.01.018
URIhttp://hdl.handle.net/10261/125278
DOI10.1016/j.nuclphysa.2013.01.018
ISSN0375-9474
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