scholarly journals CHARMING MESONS WITH BARYONS AND NUCLEI

2013 ◽  
Vol 22 (11) ◽  
pp. 1330027 ◽  
Author(s):  
LAURA TOLOS
Keyword(s):  
Wave Interaction ◽  
Spin Symmetry ◽  
Negative Parity ◽  
Open Charm ◽  
S Wave ◽  
Charmed Baryon ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Consistent Manner ◽  
The Rich

The properties of charmed mesons in nuclear matter and nuclei are reviewed. Different frameworks are discussed paying a special attention to unitarized coupled-channel approaches which incorporate heavy-quark spin symmetry. Several charmed baryon states with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with 1/2+ and 3/2+ baryons. These states are compared to experimental data. Moreover, the properties of open-charm mesons in matter are analyzed. The in-medium solution accounts for Pauli blocking effects, and for the meson self-energies in a self-consistent manner. The behavior in the nuclear medium of the rich spectrum of dynamically-generated baryon states is studied as well as their influence in the self-energy and, hence, the spectral function of open charm. The possible experimental signatures of the in-medium properties of open charm are finally addressed, such as the formation of charmed nuclei, in connection with the future FAIR facility.

scholarly journals N AND Δ HIDDEN-CHARM RESONANCES WITH HEAVY-QUARK SPIN SYMMETRY

2014 ◽  
Vol 26 ◽  
pp. 1460108
Author(s):  
OLENA ROMANETS ◽  
CARMEN GARCÍA-RECIO ◽  
LORENZO LUIS SALCEDO ◽  
JUAN NIEVES ◽  
LAURA TOLÓS
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Wave Interaction ◽  
Spin Symmetry ◽  
S Wave ◽  
Coupled Channels ◽  
Quark Spin ◽  
Charm Baryon ◽  
Heavy Quark Spin Symmetry ◽  
Baryon Resonances

We study N and Δ hidden-charm baryon resonances that are generated dynamically from the s-wave interaction of pseudoscalar and vector mesons with 1/2+ and 3/2+ baryons. We use a unitary coupled-channels model that fulfills heavy-quark spin symmetry and respects spin-flavor symmetry in the light sector. We predict seven N-like and five Δ-like states with masses around 4 GeV, most of them as bound states. Some of these states form heavy-quark spin multiplets, which are almost degenerate in mass.

scholarly journals HEAVY BARYONS IN A QUARK MODEL

2008 ◽  
Vol 23 (19) ◽  
pp. 2817-2860 ◽  
Author(s):  
W. ROBERTS ◽  
MUSLEMA PERVIN
Keyword(s):  
Heavy Quark ◽  
Quark Model ◽  
Model Prediction ◽  
Spin Symmetry ◽  
Heavy Quarks ◽  
Charmed Baryon ◽  
Heavy Baryons ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry

A quark model is applied to the spectrum of baryons containing heavy quarks. The model gives masses for the known heavy baryons that are in agreement with experiment, but for the doubly-charmed baryon Ξcc, the model prediction is too heavy. Mixing between the ΞQ and Ξ′Q states is examined and is found to be small for the lowest lying states. In contrast with this, mixing between the Ξbc and Ξ′bc states is found to be large, and the implication of this mixing for properties of these states is briefly discussed. We also examine heavy-quark spin-symmetry multiplets, and find that many states in the model can be placed in such multiplets. We compare our predictions with those of a number of other authors.

scholarly journals Masses and strong decays of open charm hexaquark states $$\Sigma _{c}^{(*)}{\Sigma }_{c}^{(*)}$$

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Xi-Zhe Ling ◽  
Ming-Zhu Liu ◽  
Li-Sheng Geng
Keyword(s):  
Bound States ◽  
Spin Symmetry ◽  
Lhcb Collaboration ◽  
Open Charm ◽  
Triangle Diagram ◽  
Mass Distributions ◽  
Effective Lagrangian ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
The One

AbstractInspired by the recent discovery of the doubly charmed tetraquark state $$T_{cc}^{+}$$ T cc + by the LHCb Collaboration, we perform a systematic study of masses and strong decays of open charm hexaquark states $${\Sigma }_{c}^{(*)}\Sigma _{c}^{(*)}$$ Σ c ( ∗ ) Σ c ( ∗ ) . Taking into account heavy quark spin symmetry breaking, we predict several bound states of isospin $$I=0$$ I = 0 , $$I=1$$ I = 1 , and $$I=2$$ I = 2 in the one boson exchange model. Moreover, we adopt the effective Lagrangian approach to estimate the decay widths of $${\Sigma }_{c}^{(*)}\Sigma _{c}^{(*)} \rightarrow \Lambda _{c}\Lambda _{c}$$ Σ c ( ∗ ) Σ c ( ∗ ) → Λ c Λ c and their relevant ratios via the triangle diagram mechanism, which range from a few MeV to a few tens of MeV. We strongly recommend future experimental searches for the $${\Sigma }_{c}^{(*)}\Sigma _{c}^{(*)}$$ Σ c ( ∗ ) Σ c ( ∗ ) hexaquark states in the $$\Lambda _c\Lambda _c$$ Λ c Λ c invariant mass distributions.

scholarly journals Exotic molecular states in the decays of vector bottomonia

2019 ◽  
Vol 212 ◽  
pp. 02002
Author(s):  
V. Baru ◽  
E. Epelbaum ◽  
A. A. Filin ◽  
C. Hanhart ◽  
A. V. Nefediev ◽  
...  
Keyword(s):  
Short Range ◽  
Spin Symmetry ◽  
Radiative Decays ◽  
Recent Experimental Data ◽  
Line Shapes ◽  
Quantum Numbers ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Belle Ii ◽  
The One

The most recent experimental data for the decays of the vector bottomonium γ(10860) proceeding through the formation of the states Zb(10610) and Zb(10650) are analysed simultaneously using solutions of the Lippmann-Schwinger equations which respect constraints from unitarity and analyticity. The interaction potential in the open-bottom channels $ {B^{(*)}}{\bar B^*} $ contains short-range interactions as well as the one-pion exchange; both types of the interaction are taken into account fully nonperturbatively. This way, all parameters of the interaction are fixed directly from the data and the pole positions for the Zb’s are determined as a prediction. In particular, both Zb states are found to be described by resonance poles located on the unphysical Riemann sheets in the vicinity of the corresponding thresholds. The heavy quark spin symmetry (HQSS) is employed to predict, in a parameter-free way, the pole positions and the line shapes in the elastic and inelastic channels for the Zbs’ spin partner states WbJ with the quantum numbers J++ (J = 0, 1, 2). Such spin partners can be produced in radiative decays of the vector bottomonium Υ(10860) and are expected to be detected in the Belle-II experiment.

HYPERFINE MIXING IN b → c SEMILEPTONIC AND ELECTROMAGNETIC DECAYS OF DOUBLY HEAVY bc BARYONS

2014 ◽  
Vol 26 ◽  
pp. 1460107
Author(s):  
C. ALBERTUS ◽  
E. HERNÁNDEZ ◽  
J. NIEVES
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Semileptonic Decay ◽  
Spin Symmetry ◽  
Mass Limit ◽  
Electromagnetic Decays ◽  
Heavy Quark Mass ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Symmetry Relations

We show that semileptonic and electromagnetic decays involving spin-1/2 doubly heavy bc baryons are very sensitive to hyperfine mixing in their wave functions. We further show how heavy quark spin symmetry relations, obtained in the infinite heavy quark mass limit and near zero recoil, could be used to extract the admixtures in a model independent way from semileptonic decay data. On the other hand the infinite heavy quark mass limit gives wrong predictions in the electromagnetic case.

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