104 research outputs found
excited states within a HQSS model
We have reviewed the renormalization procedure used in the unitarized
coupled-channel model of Phys. Rev. D85 114032 (2012), and its impact in the
, , and sector, where five states have been
recently observed by the LHCb Collaboration. The meson-baryon interactions used
in the model are consistent with both chiral and heavy-quark spin symmetries
and lead to a successful description of the observed lowest-lying odd parity
resonances and , and and
resonances. We show that some (probably at least three) of
the states observed by LHCb will also have odd parity and spins and
, belonging two of them to the same HQSS multiplets that the latter strangenessless
heavy baryons.Comment: 11 pages, 3 figures, 6 tables, published in The European Physical
Journal
Charm at FAIR
Charmed mesons in hot and dense matter are studied within a self-consistent
coupled-channel approach for the experimental conditions of density and
temperature expected at the CBM experiment at FAIR/GSI. The meson spectral
function broadens with increasing density with an extended tail towards lower
energies due to and
excitations. The in-medium meson mass increases with density. We also
discuss the consequences for the renormalized properties in nuclear matter of
the charm scalar and D(2400), and the predicted hidden charm
X(3700) resonances at FAIR energies.Comment: 6 pages, 3 figures, to appear in the proceedings of ExcitedQCD 09,
Zakopane, Poland, 8-14 February 200
and excited states within a HQSS model
We study odd parity and resonances using a unitarized
coupled-channel framework based on a HQSS-extended
Weinberg-Tomozawa baryon-meson interaction, while paying a special attention to
the renormalization procedure. We predict a large molecular
component for the with a dominant light-degree-of-freedom
spin configuration. We discuss the differences between the
and states, and conclude that they cannot be
SU(3) siblings, whereas we predict the existence of other states, two
of them related to the two-pole structure of the . It is of
particular interest a pair of and poles, which form a HQSS
doublet and that we tentatively assign to the and ,
respectively. Within this picture, the would be part of a SU(3)
sextet, containing either the or the , and
that would be completed by the . Moreover, we identify a
sextet with the state and the recently discovered
. Assuming the equal spacing rule and to complete this
multiplet, we predict the existence of a odd parity state,
with a mass of 6360 MeV and that should be seen in the channel.Comment: 13 pages, 5 figures, 4 table
Charmed hadrons in nuclear medium
We study the properties of charmed hadrons in dense matter within a
coupled-channel approach which accounts for Pauli blocking effects and meson
self-energies in a self-consistent manner. We analyze the behaviour in this
dense environment of dynamically-generated baryonic resonances as well as the
open-charm meson spectral functions. We discuss the implications of the
in-medium properties of open-charm mesons on the and the
predicted X(3700) scalar resonances.Comment: 4 pages, 5 figures, invited parallel talk in the 5th International
Conference on Quarks and Nuclear Physics (QNP09), Beijing, September 21-26,
200
Energy and momentum relaxation of heavy fermion in dense and warm plasma
We determine the drag and the momentum diffusion coefficients of heavy
fermion in dense plasma. It is seen that in degenerate matter drag coefficient
at the leading order mediated by transverse photon is proportional to
while for the longitudinal exchange this goes as . We
also calculate the longitudinal diffusion coefficient to obtain the Einstein
relation in a relativistic degenerate plasma. Finally, finite temperature
corrections are included both for the drag and the diffusion coefficients.Comment: 8 pages, 1 eps figure, typos corrected and paragraphs rearranged.
Accepted for publication in Physical Review
Strange and charm mesons at FAIR
We study the properties of strange and charm mesons in hot and dense matter
within a self-consistent coupled-channel approach for the experimental
conditions of density and temperature expected for the CBM experiment at
FAIR/GSI. The in-medium solution at finite temperature accounts for Pauli
blocking effects, mean-field binding of all the baryons involved, and meson
self-energies. We analyze the behaviour in this hot and dense environment of
dynamically-generated baryonic resonances together with the evolution with
density and temperature of the strange and open-charm meson spectral functions.
We test the spectral functions for strange mesons using energy-weighted sum
rules and finally discuss the implications of the properties of charm mesons on
the D_{s0}(2317) and the predicted X(3700) scalar resonances.Comment: 12 pages, 9 figures, invited talk at XXXI Mazurian Lakes Conference
on Physics: Nuclear Physics and the Road to FAIR, August 30-September 6,
2009, Piaski, Polan
Selected topics on Hadrons in Nuclei
In this talk we report on selected topics on hadrons in nuclei. The first
topic is the renormalization of the width of the in a nuclear
medium. This is followed by a short update of the situation of the in
the medium. The investigation of the properties of in the nuclear
medium from the study of the reaction is also addressed, as
well as properties of X,Y,Z charmed and hidden charm resonances in a nuclear
medium. Finally we address the novel issue of multimeson states.Comment: Talk at the International Nuclear Physics Conference, Vancouver, July
201
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