Related references
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Article
Physics, Multidisciplinary
Nilmani Mathur et al.
Summary: We present the first lattice QCD study of the heavy dibaryons with all six quarks being of bottom flavor. Using state-of-the-art lattice QCD calculation, we provide clear evidence for a deeply bound SZbbb-SZbbb dibaryon in the 1S0 channel, identified as a pole singularity in the S-wave scattering amplitude. The binding energy is found to be -81(+14-16) MeV. The Coulomb repulsion only serves as a perturbation on the ground state wave function and has a negligible effect on the strong binding.
PHYSICAL REVIEW LETTERS
(2023)
Editorial Material
Multidisciplinary Sciences
Peng -Yu Niu et al.
Article
Astronomy & Astrophysics
Chang Gong et al.
Summary: We find that Pomeron exchanges play a crucial role in vector charmonium scatterings and can provide an explanation for the unique structures observed by the LHCb Collaboration. The presence of a narrow structure X(6900), formed by the exchange of Pomerons and coupled-channel effects, is predicted near the di-J/psi threshold. Furthermore, we predict that X(6900) will result in significant threshold enhancement in the J/psi-psi(2S) energy spectrum, which can be detected at LHCb.
Article
Multidisciplinary Sciences
Rudolf N. N. Faustov et al.
Summary: This study calculates the masses of fully heavy tetraquarks' ground and excited states (namely 1P, 2S, 1D, 2P, 3S) comprising charm and bottom quarks and antiquarks. The calculations are based on the diquark-antidiquark picture within the relativistic quark model and employ the quasipotential approach and quantum chromodynamics. The findings demonstrate that most investigated states of tetraquarks exist as broad resonances above the decay thresholds.
Proceedings Paper
Physics, Particles & Fields
Wei Chen et al.
Summary: This talk briefly reports on the investigations of mass spectra for tetraquark states using the QCD moment sum rule method. The existence of fully-charm tetraquarks, including the observation of X(6900) di-J/psi resonances in LHCb, has been successfully predicted. Quantum numbers for these resonance structures have also been suggested. More efforts are needed in both theoretical and experimental aspects to study the properties of these fully-heavy tetraquark states.
NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS
(2022)
Article
Physics, Nuclear
Zhi-Gang Wang
Summary: In this paper, we construct diquark-cliquark-cliquark-type vector six-quark currents and use them to investigate vector and scalar hexaquark states. We also make predictions for hexaquark masses. In the future, we can search for fully heavy hexaquark states in the di-Omega(ccc) and di-Omega(bbb) invariant mass spectra. This study, combined with previous works on tetraquark and pentaquark states, can provide insights into the nature of fully heavy multiquark states.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Astronomy & Astrophysics
Halil Mutuk
Summary: This article introduces the dynamical diquark model, which proposes that exotic hadrons can be formed from colored diquarks. Using numerical calculations and approximation methods, the mass spectra of S-wave cc (b) over bar(b) over bar, bc (c) over bar(c) over bar, and bc (b) over bar(b) over bar tetraquark systems are studied, with one of the systems identified as a candidate for a bound state.
Article
Astronomy & Astrophysics
J. M. Alcaraz-Pelegrina et al.
Summary: A diffusion Monte Carlo technique was used to describe fully heavy compact arrangements in a constituent quark model. The masses of the six-quark arrangements were found to be larger than the sums of any of the two baryons they can be split into, but smaller than the masses for a set of six isolated quarks, indicating that they are bound systems. The analysis showed that all the hexaquarks considered in this study are compact objects, except for cccbbb, which appears to be a loose association of two baryons for all possible spin values.
Article
Physics, Particles & Fields
Jie Zhang et al.
Summary: This study systematically investigates the fully heavy tetraquark states using a nonrelativistic constituent quark model, taking into account the instanton-induced and one-gluon exchange interactions. The results show the existence of specific states at certain energy ranges. It suggests that the newly observed X(6900) state by LHCb may be an excited state, while the reported X(6600) state by CMS and ATLAS may be a ground state tetraquark.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Hongxia Huang et al.
Summary: This study investigates the existence of fully heavy dibaryons Omega(ccc)Omega(bbb), Omega(ccb)Omega(bbc), Omega(ccc)Omega(ccc), and Omega(bbb)Omega(bbb) with specific quantum numbers in a constituent quark model framework. The findings suggest that under certain conditions, fully heavy dibaryons composed of specific quark combinations may form bound states, providing theoretical basis for the formation of fully heavy systems.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Zhongkui Kuang et al.
Summary: This study examines all-charm tetraquarks using basis light-front quantization in Hamiltonian dynamics, focusing on mass calculations and meson-meson breakup threshold estimates. Results indicate that the lowest two-charm-two-anticharm state is not a tightly bound tetraquark.
Article
Astronomy & Astrophysics
A. J. Majarshin et al.
Summary: In this study, the exact eigenenergies of T-4c, T-4b, and T-2[bc] tetraquarks were calculated using the extended transitional Hamiltonian approach. The results indicate that the rotation and vibration transitional theory provides a better description of heavy tetraquarks. A comparison with the current literature was also performed.
Article
Physics, Particles & Fields
Jacob Sonnenschein et al.
Summary: A novel hadronic state with a mass of 6.9 GeV discovered by LHCb decays mainly to a pair of charmonia, while data also suggests the presence of broader structures and unconfirmed resonances. It is argued that these exotic hadrons are tetraquarks with a V-baryonium structure, and the need for further research and testing for the decay of the state at 7.2 GeV into Xi ccXi cc is emphasized.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Nuclear
Rohit Tiwari et al.
Summary: In this article, a non-relativistic potential model is utilized to calculate the mass-spectra of bottom and heavy-light bottom tetraquark states. The four-body problem is simplified into a two-body problem using a diquark-antidiquark approximation, and the Schrodinger equation is solved numerically with a Cornell-inspired potential and relativistic correction term. Various spin-dependent terms are used to describe the splitting structure of the tetraquark spectrum. The calculated masses of bottom mesons, diquarks, and tetraquarks fall within specific energy ranges, and the Z(b)(10610) and Z(b)(10650) states are found to be below certain thresholds in the current model.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Astronomy & Astrophysics
Rafal Maciula et al.
Summary: The study discusses the production mechanism of a putative fully charm tetraquark observed by LHCb recently, considering both single parton scattering (SPS) and double parton scattering (DPS) mechanisms. Calculations show that the contribution of DPS is almost two orders of magnitude larger than SPS, but the tetraquark formation mechanism remains unknown. The preferred spin scenario is 0(+) over 0(-) based on comparison with LHCb preliminary data.
Article
Physics, Particles & Fields
Bo-Cheng Yang et al.
Summary: Researchers identified distinct structures in the J/Psi-pair mass spectrum as different masses of tetraquark states using QCD sum rules. The octet-octet tetraquark states were found to have masses around 6.44-6.96 GeV, with corresponding fully-bottom partners around 18.38-18.59 GeV.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Hong-Wei Ke et al.
Summary: This study investigates the possible cc-(c) over bar(c) over bar bound states and the interaction between diquark (cc) and antidiquark ((c) over bar(c) over bar) within the Bethe-Salpeter framework. Numerical solutions of the B-S equations for different quantum numbers show that some excited states' spectra can be close to the mass of the newly discovered X(6900) with appropriate parameter values. Future measurements of the bb-(b) over bar(b) over bar state may aid in determining the exact form of effective interaction.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Halil Mutuk
Summary: This study aimed to estimate the masses of ground and excited states of fully-heavy tetraquark systems using a nonrelativistic model. The predicted masses of ground states were found to be higher than the decay thresholds, making them difficult to observe experimentally, while the first excited states showed lower masses compared to their respective thresholds, suggesting potential observability in experiments.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Victor P. Goncalves et al.
Summary: The study investigates the production of fully-heavy tetraquark states T-4Q in gamma gamma interactions at the LHC, focusing on the γγ -> QQ(Q = J/psi, Y) subprocess mediated by the T-4Q resonance in the s-channel. Predictions for hadronic cross sections in the kinematic ranges probed by the ALICE and LHCb Collaborations are presented, demonstrating the potential of experimental studies on this process to investigate the existence and properties of the T-4Q states.
Review
Astronomy & Astrophysics
Rudolf N. Faustov et al.
Summary: The masses of tetraquarks with two and four heavy quarks were calculated in the relativistic quark model using the quasipotential approach and QCD, based on the diquark-antidiquark picture. A comparison with experimental data revealed numerous candidates for tetraquarks, with the recent structures observed in the di-J/psi mass spectrum potentially corresponding to ccc over bar c over bar tetraquarks.
Article
Physics, Particles & Fields
A. V. Nefediev
Summary: The LHCb Collaboration recently observed nontrivial structures in the double-J/psi mass spectrum in the mass range of 6.2-7.2 GeV, and identified a new state X(6200) close to the double-J/psi threshold. The QCD string model suggests the existence of a compact cccc state below the double-J/psi threshold, with an interplay between quark dynamics and molecular dynamics. The physical X(6200) is argued to be a shallow bound state, consistent with the results of the coupled-channel analysis of the LHCb data.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Jean-Marc Richard
Summary: In the framework of potential models, the stability of multiquarks made of heavy quarks and antiquarks is discussed. Handling the few-body problem seriously and accurately is emphasized. No bound states are found within current models, but resonances are likely present in the spectrum above the lowest threshold.
Article
Astronomy & Astrophysics
Feng Feng et al.
Summary: The study uses a novel factorization formula within the NRQCD framework to analyze the exclusive production of fully-charmed tetraquark T-4c with a hard photon at a super B factory. By concentrating on the production of 0(++) and 2(++) T-4c with a photon and making rough estimates about unknown nonperturbative NRQCD matrix elements in a simplified model, the study predicts the production rates of these exclusive production channels at root s = 10.58 GeV and evaluates their observation prospect at the Belle 2 experiment.
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Jean-Marc Richard et al.
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