We study odd parity
J
=
1
/
2
and
J
=
3
/
2
Ξ
c
resonances using a unitarized coupled-channel framework based on a
SU
(
6
)
lsf
×
HQSS-extended Weinberg–Tomozawa baryon–meson interaction, while ...paying a special attention to the renormalization procedure. We predict a large molecular
Λ
c
K
¯
component for the
Ξ
c
(
2790
)
with a dominant
0
-
light-degree-of-freedom spin configuration. We discuss the differences between the
3
/
2
-
Λ
c
(
2625
)
and
Ξ
c
(
2815
)
states, and conclude that they cannot be SU(3) siblings, whereas we predict the existence of other
Ξ
c
-states, one of them related to the two-pole structure of the
Λ
c
(
2595
)
. It is of particular interest a pair of
J
=
1
/
2
and
J
=
3
/
2
poles, which form a HQSS doublet and that we tentatively assign to the
Ξ
c
(
2930
)
and
Ξ
c
(
2970
)
, respectively. Within this picture, the
Ξ
c
(
2930
)
would be part of a SU(3) sextet, containing either the
Ω
c
(
3090
)
or the
Ω
c
(
3119
)
, and that would be completed by the
Σ
c
(
2800
)
. Moreover, we identify a
J
=
1
/
2
sextet with the
Ξ
b
(
6227
)
state and the recently discovered
Σ
b
(
6097
)
. Assuming the
equal spacing rule
and to complete this multiplet, we predict the existence of a
J
=
1
/
2
Ω
b
odd parity state, with a mass of 6360 MeV and that should be seen in the
Ξ
b
K
¯
channel.
We have reviewed the renormalization procedure used in the unitarized coupled-channel model of Romanets et al. (Phys Rev D 85:114032,
2012
), and its impact in the
C
=
1
,
S
=
-
2
, and
I
=
0
sector, ...where five
Ω
c
(
∗
)
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
Λ
c
(
2595
)
and
Λ
c
(
2625
)
, and
Λ
b
(
5912
)
and
Λ
b
(
5920
)
resonances. We show that some (probably at least three) of the states observed by LHCb will also have odd parity and
J
=
1
/
2
or
J
=
3
/
2
, belonging two of them to the same
SU
(
6
)
light
-
spin
-
flavor
×
HQSS multiplets as the latter charmed and beauty
Λ
baryons.
We analyze the modifications that a dense nuclear medium induces in the Ds0⁎(2317)± and Ds1(2460)±. In the vacuum, we consider them as isoscalar D(⁎)K and ▪S-wave bound states, which are dynamically ...generated from effective interactions that lead to different Weinberg compositeness scenarios. Matter effects are incorporated through the two-meson loop functions, taking into account the self energies that the D(⁎), ▪, K, and ▪ develop when embedded in a nuclear medium. Although particle-antiparticle Ds0,s1(⁎)(2317,2460)+versusDs0,s1(⁎)(2317,2460)− lineshapes are the same in vacuum, we find extremely different density patterns in matter. This charge-conjugation asymmetry mainly stems from the very different kaon and antikaon interaction with the nucleons of the dense medium. We show that the in-medium lineshapes found for these resonances strongly depend on their D(⁎)K/▪ molecular content, and discuss how this novel feature can be used to better determine/constrain the inner structure of these exotic states.
We review the present status of the experimental and theoretical developments in the field of strangeness in nuclei and neutron stars. We start by discussing the K̄N interaction, that is governed by ...the presence of the Λ(1405). We continue by showing the two-pole nature of the Λ(1405), and the production mechanisms in photon-, pion-, kaon-induced reactions as well as proton–proton collisions, while discussing the formation of K̄NN bound states. We then move to the theoretical and experimental analysis of the properties of kaons and antikaons in dense nuclear matter, paying a special attention to kaonic atoms and the analysis of strangeness creation and propagation in nuclear collisions. Next, we examine the ϕ meson and the advances in photoproduction, proton-induced and pion-induced reactions, so as to understand its properties in dense matter. Finally, we address the dynamics of hyperons with nucleons and nuclear matter, and the connection to the phases of dense matter with strangeness in the interior of neutron stars.
We study charmed and strange baryon resonances that are generated dynamically by a unitary baryon-meson coupled-channel model which incorporates heavy-quark spin symmetry. This is accomplished by ...extending the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry plus a suitable symmetry breaking. The model produces resonances with negative parity from s-wave interaction of pseudoscalar and vector mesons with l/2 super(+) and 3/2 super(+) baryons. Resonances in all the isospin, spin, and strange sectors with one, two, and three charm units are studied. Our results are compared with experimental data from several facilities, such as the CLEO, Belle or BABAR collaborations, as well as with other theoretical models. Some of our dynamically-generated states can be readily assigned to resonances found experimentally, while others do not have a straightforward identification and require the compilation of more data and also a refinement of the model. In particular, we identify the Xi sub()c2790) and Xi sub()c2815) resonances as possible candidates for a heavy-quark spin symmetry doublet.
Abstract
We study odd parity
$$J=1/2$$
J
=
1
/
2
and
$$J=3/2$$
J
=
3
/
2
$$\Xi _c$$
Ξ
c
resonances using a unitarized coupled-channel framework based on a
$$\mathrm{SU(6)}_{\mathrm{lsf}}\times $$
SU
...(
6
)
lsf
×
HQSS-extended Weinberg–Tomozawa baryon–meson interaction, while paying a special attention to the renormalization procedure. We predict a large molecular
$$\Lambda _c {\bar{K}}$$
Λ
c
K
¯
component for the
$$\Xi _c(2790)$$
Ξ
c
(
2790
)
with a dominant
$$0^-$$
0
-
light-degree-of-freedom spin configuration. We discuss the differences between the
$$3/2^-$$
3
/
2
-
$$\Lambda _c(2625)$$
Λ
c
(
2625
)
and
$$\Xi _c(2815)$$
Ξ
c
(
2815
)
states, and conclude that they cannot be SU(3) siblings, whereas we predict the existence of other
$$\Xi _c$$
Ξ
c
-states, one of them related to the two-pole structure of the
$$\Lambda _c(2595)$$
Λ
c
(
2595
)
. It is of particular interest a pair of
$$J=1/2$$
J
=
1
/
2
and
$$J=3/2$$
J
=
3
/
2
poles, which form a HQSS doublet and that we tentatively assign to the
$$\Xi _c(2930)$$
Ξ
c
(
2930
)
and
$$\Xi _c(2970)$$
Ξ
c
(
2970
)
, respectively. Within this picture, the
$$\Xi _c(2930)$$
Ξ
c
(
2930
)
would be part of a SU(3) sextet, containing either the
$$\Omega _c(3090)$$
Ω
c
(
3090
)
or the
$$\Omega _c(3119)$$
Ω
c
(
3119
)
, and that would be completed by the
$$\Sigma _c(2800)$$
Σ
c
(
2800
)
. Moreover, we identify a
$$J=1/2$$
J
=
1
/
2
sextet with the
$$\Xi _b(6227)$$
Ξ
b
(
6227
)
state and the recently discovered
$$\Sigma _b(6097)$$
Σ
b
(
6097
)
. Assuming the
equal spacing rule
and to complete this multiplet, we predict the existence of a
$$J=1/2$$
J
=
1
/
2
$$\Omega _b$$
Ω
b
odd parity state, with a mass of 6360 MeV and that should be seen in the
$$\Xi _b {\bar{K}}$$
Ξ
b
K
¯
channel.
.
Open and hidden heavy-flavor physics in high-energy nuclear collisions are entering a new and exciting stage towards reaching a clearer understanding of the new experimental results with the ...possibility to link them directly to the advancement in lattice Quantum Chromo-Dynamics (QCD). Recent results from experiments and theoretical developments regarding open and hidden heavy-flavor dynamics have been debated at the Lorentz Workshop
Tomography of the Quark-Gluon Plasma with Heavy Quarks
, which was held in October 2016 in Leiden, The Netherlands. In this contribution, we summarize identified common understandings and developed strategies for the upcoming five years, which aim at achieving a profound knowledge of the dynamical properties of the quark-gluon plasma.
We investigate the structure and formation of charmed meson–nucleus systems, with the aim of understanding the charmed meson–nucleon interactions and the properties of the charmed mesons in the ...nuclear medium. The D¯ mesic nuclei are of special interest, since they have tiny decay widths due to the absence of strong decays for the D¯N pair. Employing an effective model for the D¯N and DN interactions and solving the Klein–Gordon equation for D¯ and D in finite nuclei, we find that the D−–11B system has 1s and 2p mesic nuclear states and that the D0–11B system binds in a 1s state. In view of the forthcoming experiments by the PANDA and CBM Collaborations at the future FAIR facility and the J-PARC upgrade, we calculate the formation spectra of the D−–11B and D0–11B mesic nuclei for an antiproton beam on a 12C target. Our results suggest that it is possible to observe the 2pD− mesic nuclear state with an appropriate experimental setup.
D mesic nuclei García-Recio, C.; Nieves, J.; Tolos, L.
Physics letters. B,
06/2010, Letnik:
690, Številka:
4
Journal Article
Recenzirano
Odprti dostop
The energies and widths of several D0 meson bound states for different nuclei are obtained using a D-meson selfenergy in the nuclear medium, which is evaluated in a selfconsistent manner using ...techniques of unitarized coupled-channel theory. The kernel of the meson–baryon interaction is based on a model that treats heavy pseudoscalar and heavy vector mesons on equal footing, as required by heavy quark symmetry. We find D0 bound states in all studied nuclei, from 12C up to 208Pb. The inclusion of vector mesons is the keystone for obtaining an attractive D–nucleus interaction that leads to the existence of D0–nucleus bound states, as compared to previous studies based on SU(4) flavor symmetry. In some cases, the half widths are smaller than the separation of the levels, what makes possible their experimental observation by means of a nuclear reaction. This can be of particular interest for the future P̄ANDA@FAIR physics program. We also find a D+ bound state in 12C, but it is too broad and will have a significant overlap with the energies of the continuum.
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