scholarly journals Molecular interpretation of the LHCb pentaquarks from an analysis of J/ψp spectrum

2022 ◽  
Vol 258 ◽  
pp. 04007
Author(s):  
Meng-Lin Du
Keyword(s):  
Spin Symmetry ◽  
Lhcb Collaboration ◽  
Exchange Potential ◽  
Mass Distributions ◽  
Line Shapes ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Molecular Interpretation ◽  
The One ◽  
Coupled Channel

A coupled-channel approach including the ΛcD¯(*) and ηcp channels in addition to the Σc(*)D¯(*) and J/ψp channels, as required by unitarity and heavy quark spin symmetry (HQSS), is applied to the hidden-charm pentaquark Pc states, i.e., Pc(4312), Pc(4440) and Pc(4457), discovered by LHCb Collaboration. It is demonstrated that to obtain cutoff independent results, the one-pion exchange potential in the multichannel systems is to be supplemented with next-leading order counter terms responsible for the S-wave-to-D-wave transitions. We show that the experimental data for the J/ψp mass distributions are fully in line with the ΣcD¯ and ΣcD¯* hadronic molecular interpretation of the Pc(4312) and Pc(4440)/Pc(4457), respectively. A narrow Σc*D¯ molecule around 4.38 GeV is required by the HQSS with the evidence for its existence seen in the J/ψp spectrum. Moreover, we predict the line shapes for the elastic and inelastic channels.

$\bar{D}$ and B nuclei with one pion exchange potential

2014 ◽  
Vol 29 ◽  
pp. 1460226
Author(s):  
Y. Yamaguchi ◽  
A. Hosaka ◽  
S. Yasui
Keyword(s):  
Spin Symmetry ◽  
Pion Exchange ◽  
Exchange Potential ◽  
Exotic States ◽  
Resonant States ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
The One ◽  
Three Body ◽  
Coupled Channel

We discuss the possible existence of exotic dibaryons with a heavy antiquark, being realized three-body systems, [Formula: see text] and B(*)NN. These are genuinely exotic states with no quark-antiquark annihilation. We consider the heavy quark spin symmetry and chiral symmetry, and introduce the one pion exchange potential between a [Formula: see text] meson and a nucleon N. As for the NN interaction, we employ the Argonne [Formula: see text] potential. By solving the coupled-channel equations for PNN and [Formula: see text], we find bound and resonant states near the thresholds both in charm and bottom sectors.

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.

scholarly journals Heavy-quark spin-symmetry partners of Zb(10610) and Zb(10650) molecules

2019 ◽  
Vol 218 ◽  
pp. 08005
Author(s):  
V. Baru ◽  
E. Epelbaum ◽  
A. A. Filin ◽  
C. Hanhart ◽  
A. V. Nefediev
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Spin Symmetry ◽  
Mass Splitting ◽  
Quantum Numbers ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Tensor Part ◽  
Coupled Channel ◽  
Molecular Picture

Heavy-quark spin-symmetry (HQSS) partners of the isovector bottomonium like states Zb(10610) and Zb(10650) are predicted within the molecular picture. Treating both Zb’s as shallow bound states, we solve the system of coupled-channel integral equations for the contact plus one-pion exchange (OPE) potentials to predict the location of the partner states with the quantum numbers J++ (J = 0,1,2). In particular, we predict the existence of a narrow tensor 2++ state residing a few MeV below the B∗ B¯∗ threshold. It is emphasised that the tensor part of the OPE potential in combination with HQSS breaking due to the nonvanishing B∗ -B mass splitting has a significant impact on the location of this partner state.

scholarly journals Charmed dibaryon resonances in the potential quark model

2019 ◽  
Vol 49 ◽  
pp. 1960004 ◽  
Author(s):  
Makoto Oka ◽  
Saori Maeda ◽  
Yan-Rui Liu
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Binding Energies ◽  
Resonance States ◽  
Complex Scaling Method ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Heavy Quark Limit ◽  
Partial Channel ◽  
Coupled Channel

Charmed dibaryon states with the spin-parity [Formula: see text], and [Formula: see text] are predicted for the two-body [Formula: see text] ([Formula: see text], [Formula: see text], or [Formula: see text]) systems. We employ the complex scaling method for the coupled channel Hamiltonian with the [Formula: see text]-CTNN potentials, which were proposed in our previous study. We find four sharp resonance states near the [Formula: see text] and [Formula: see text] thresholds. From the analysis of the binding energies of partial channel systems, we conclude that these resonance states are Feshbach resonances. We compare the results with the [Formula: see text] resonance states in the heavy quark limit, where the [Formula: see text] and [Formula: see text] thresholds are degenerate, and find that they form two pairs of the heavy-quark doublets in agreement with the heavy quark spin symmetry.

PREDICTION OF HIDDEN CHARM BARYONS WITH HEAVY QUARK SPIN AND LOCAL HIDDEN GAUGE SYMMETRIES

2014 ◽  
Vol 26 ◽  
pp. 1460072
Author(s):  
CHU-WEN XIAO ◽  
JUAN NIEVES ◽  
EULOGIO OSET
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Baryon Interaction ◽  
Gauge Symmetries ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Unitary Approach ◽  
Basic States ◽  
Charm Baryons ◽  
Coupled Channel

In our talk, we explore a coupled channel unitary approach to investigate the meson baryon interaction with hidden charm, using constraints of heavy quark spin symmetry. With the full space of states demanded by the heavy quark spin symmetry and the dynamics of the local hidden gauge, we find four basic states which are bound by about 50 MeV with respect to the corresponding [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] thresholds respectively and decay mostly into ηcN and J/ψN. All the states appear in isospin I = 1/2, some of which are degenerated in different momentum J.

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