17 research outputs found
Strange meson production at high density and temperature
The properties of strange mesons (, and ) in dense
matter are studied using a unitary approach in coupled channels for
meson-baryon scattering. The kaon-nucleon interaction incorporates - and
-wave contributions within a chiral model whereas the interaction of with nucleons is obtained in the framework of the local hidden gauge
formalism. The in-medium solution for the scattering amplitude accounts for
Pauli blocking effects, mean-field binding on baryons, and meson self-energies.
We obtain the , and (off-shell) spectral functions in
the nuclear medium and study their behaviour at finite density, temperature and
momentum. We also analyze the energy weighted sum rules of the kaon propagator
as a quality test of model calculations. We finally estimate the transparency
ratio of the reaction, which we propose as a
feasible scenario at present facilities to detect in-medium modifications of
the meson.Comment: 6 pages, 5 figures, invited seminar in New Frontiers in QCD 2010
-Exotic Hadron Systems and Dense Matter- (NFQCD2010), Kyoto, January 18-March
19, 201
Charm and Hidden Charm Scalar Resonances in Nuclear Matter
We study the properties of the scalar charm resonances and
, and the theoretical hidden charm state X(3700) in nuclear matter.
We find that for the and X(3700) resonances, with negligible and
small width at zero density, respectively, the width becomes about and at normal nuclear matter density, accordingly. For
the change in width is relatively less important. We discuss the
origin of this new width and trace it to reactions occurring in the nucleus. We
also propose a possible experimental test for those modifications in nuclear
matter, which will bring valuable information on the nature of those scalar
resonances and the interaction of mesons with nucleons.Comment: 3 pages, 3 figures, to appear in the proceedings of the International
Conference on Particles And Nuclei (PANIC08), Eilat, Israel, November 9-14,
200
Nuclear medium effects on the meson
The meson in dense matter is analyzed by means of a unitary
approach in coupled channels based on the local hidden gauge formalism. The
self-energy and the corresponding spectral function in
the nuclear medium are obtained. We observe that the develops a
width in matter up to five times bigger than in free space. We also estimate
the transparency ratio of the reaction. This
ratio is an excellent tool to detect experimentally modifications of the meson in dense matter.Comment: 11 pages, 5 figures, contribution based on the invited talk at ECT*
Workshop "Strange Hadronic Matter", September 26-30, 201
(K)over-bar* meson in nuclear matter
The properties of the meson in dense matter are studied using a
unitary approach in coupled channels within the framework of the local hidden
gauge formalism. We obtain the spectral function in the nuclear
medium and we found that the develops an in-medium width up to five
times bigger than in free space. We also estimate the transparency ratio of the
reaction, which we propose as a feasible
experimental scenario to detect in-medium modifications of the
meson.Comment: 6 pages, 5 figures, talk at International Nuclear Physics Conference
2010 (INPC2010), July 4-9, 2010, Vancouver (Canada