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 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.

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.

$\bar{D}$ 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 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 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.

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