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Article
Physics, Particles & Fields
S. S. Agaev et al.
Summary: In this work, the newly observed doubly charmed four-quark state T-cc(+) is treated as an axial-vector tetraquark and its spectroscopic parameters and width are calculated. Various methods, including the QCD two-point sum rule method and QCD three-point sum rule method, are used to determine the mass, current coupling, and width of the tetraquark T-cc(+).
Article
Physics, Multidisciplinary
A. M. Sirunyan et al.
Summary: The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The characteristics of X(3872) in lead-lead collisions are revealed through an analysis of the production process and decay chain. This result provides unique experimental evidence for the production mechanism and nature of X(3872).
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Xi-Zhe Ling et al.
Summary: Inspired by the recent discovery of a doubly charmed tetraquark state T-cc(+) by the LHCb Collaboration, this study investigates the decay width of T-cc(+) using the effective Lagrangian approach and assumes it to be an isoscalar DD* molecule. The results show that both T-cc -> DD pi and T-cc -> DD gamma contribute to the decay width, with the former being dominant.
Article
Astronomy & Astrophysics
Tao Guo et al.
Summary: This study systematically investigates the mass spectra of S-wave doubly heavy tetraquark states with different quantum numbers using the improved chromomagnetic interaction model. The parameters of the model are obtained by fitting conventional hadron spectra and used to predict the masses of the tetraquark states. The results show the presence of several stable bound states in both doubly charmed and doubly bottomed tetraquark systems, consistent with experimental measurements.
Article
Astronomy & Astrophysics
Mao-Jun Yan et al.
Summary: The LHCb Collaboration has recently announced the discovery of the T-cc(+) tetraquark, which is only a few hundred keV below the D*+D-0 threshold. It is expected to have a molecular component, and theoretical predictions can be made accurately due to the separation of scales. The important decay channels include D+D-0 pi(0), (DD0)-D-0 pi(+), and D+D-0 gamma. The mass and width of the T-cc(+) tetraquark depend on the resonance profile due to its closeness to threshold.
Article
Astronomy & Astrophysics
Meng-Lin Du et al.
Summary: In this study, a coupled-channel approach is applied to investigate the charged tetraquark state T-cc(+) recently discovered by the LHCb Collaboration. The observed line shape in the three-body (DD0)-D-0 pi(+) channel is fitted to determine the parameters of the interaction. Special attention is paid to the three-body dynamics in the T-cc(+) and it is argued that considering both the pion exchange between the D and D* mesons and the finite D* width is essential for a self-consistent approach. It is found that the T-cc(+) is a hadronic molecule generated by the interactions in the D*D-+(0) and D*D-0(+) channels, with a compositeness parameter close to unity. Additionally, a predicted isoscalar D* D* molecular partner of the T-cc(+) is proposed under certain assumptions.
Article
Physics, Nuclear
Jian-Bo Cheng et al.
Summary: In this study, the masses of QQ (q) over bar(q) over bar tetraquark states are calculated using the HDAS and CMI model. The results indicate that double-charm tetraquarks are unstable, while stable double-bottom tetraquarks have specific mass ranges.
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, Nuclear
Qin Qin et al.
Summary: This study investigates the discovery potential of double-charm tetraquarks T4.6.4.6.1, finding that their production cross sections at LHCb could lead to their discovery in the near future. The research also discusses the production and decays of these particles at future Tera-Z factories.
Article
Physics, Multidisciplinary
Xiang-Kun Dong et al.
Summary: In this study, the spectrum of hadronic molecules composed of heavy-antiheavy charmed hadrons was examined, with experimental candidates such as X(3872) and Y(4260) fitting well. The success in describing heavy-antiheavy hadronic molecules led to predictions for heavy-heavy cases, highlighting the potential existence of DD* and D-(*)Sigma((*))(c) molecules. Recent experimental findings support the existence of heavy-heavy hadronic molecules, providing opportunities for further observation in upcoming LHCb and other experiments.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2021)
Article
Astronomy & Astrophysics
Rui Chen et al.
Summary: This study successfully predicts the mass of doubly charmed molecular tetraquark states and proposes the existence of the resonance state T'(+)(cc) by considering the isospin breaking effect. The results provide a new method for identifying doubly charmed molecular states.
Article
Astronomy & Astrophysics
Yuanyuan Hu et al.
Summary: This paper demonstrates how heavy ion collisions can serve as a powerful platform for studying doubly charmed exotic hadrons, providing valuable insights into the dynamics of hadron structures in a charm-rich environment. The yields of T-cc(+) and its isospin partners in Pb-Pb collisions show significant enhancements compared to proton-proton collisions. The results on rapidity, transverse momentum dependence, and elliptic flow coefficient can be further tested by future experimental measurements.
Review
Astronomy & Astrophysics
Sean Fleming et al.
Summary: Researchers have discovered the tetraquark system T thorn cc, which may have a significant molecular component, and have calculated its decay process and differential spectrum in good agreement with experimental measurements. Furthermore, it is pointed out that the existence of shallow bound states of two pseudoscalar charm mesons can significantly enhance the width of T thorn cc if present.
Article
Astronomy & Astrophysics
A. Feijoo et al.
Summary: In this study, a unitary coupled channel analysis was performed on the interaction of the D*D-+(0), D*D-0(+) channels, revealing a state that is barely bound and very close to isospin I = 0. Using experimental data as input, the width of the state and the (DD0π-)-D0+ mass distribution were obtained, showing good agreement with results from other data analyses. When considering experimental resolution, the width of the state was found to be about 43 keV, a significant difference from the initial findings.
Article
Astronomy & Astrophysics
K. Azizi et al.
Summary: This study investigates the magnetic dipole moments of the doubly charmed state T-cc and the theoretically predicted singly charmed state Z(v)(+)(+), providing numerical results for their values. The findings could be useful for further phenomenological verification and exact determination of the nature of these states.
Article
Astronomy & Astrophysics
Lu Meng et al.
Summary: The study focuses on the characteristics of the doubly charmed tetraquark state T-cc(+), including binding energy, coupling constants, and various decay channels. The results indicate that the decay width of T-cc(+) -> (DD0)-D-0 pi(+) is the largest, suggesting this as the dominant experimental observation channel.
Article
Astronomy & Astrophysics
Sungsik Noh et al.
Summary: The study improves the nonrelativistic quark model by introducing a complete set of three-dimensional harmonic oscillator bases and validates the method by comparing calculated binding energies with exact values for the hydrogen model. The new method is applied to analyze double heavy tetraquark states and calculate ground state masses, with certain states found to be stable against the two lowest threshold meson states. The study also discusses the spatial sizes of the tetraquarks.
Article
Astronomy & Astrophysics
Eric Braaten et al.
Summary: In the heavy-quark limit, two heavy quarks in a doubly heavy baryon or tetraquark are bound into a compact diquark by their color-Coulomb potential. The doubly heavy hadrons are related to heavy hadrons obtained by replacing the heavy diquark with a heavy antiquark, based on the heavy-quark-diquark symmetry of QCD. Effective field theories can be used to approximate the masses of singly heavy and doubly heavy hadrons by expanding them in inverse powers of heavy-quark masses. The masses of ground-state doubly heavy tetraquarks, predicted to be stable against strong decays, can be determined based on experimental measurements of heavy mesons and baryons, as well as lattice QCD calculations for doubly heavy baryons.
Article
Physics, Nuclear
Chengrong Deng et al.
EUROPEAN PHYSICAL JOURNAL A
(2020)
Article
Physics, Multidisciplinary
Yue Tan et al.
EUROPEAN PHYSICAL JOURNAL PLUS
(2020)
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Astronomy & Astrophysics
Gang Yang et al.
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Astronomy & Astrophysics
Qi-Fang Lu et al.
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Physics, Nuclear
Woosung Park et al.
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Astronomy & Astrophysics
Rui Chen et al.
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Astronomy & Astrophysics
Parikshit Junnarkar et al.
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Luciano Maiani et al.
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Astronomy & Astrophysics
Ming-Zhu Liu et al.
Article
Physics, Multidisciplinary
Zhi-Gang Wang
ACTA PHYSICA POLONICA B
(2018)
Article
Physics, Particles & Fields
Si-Qiang Luo et al.
EUROPEAN PHYSICAL JOURNAL C
(2017)
Article
Physics, Multidisciplinary
Estia J. Eichten et al.
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Multidisciplinary
Marek Karliner et al.
PHYSICAL REVIEW LETTERS
(2017)
Review
Physics, Multidisciplinary
Hua-Xing Chen et al.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2016)
Article
Physics, Particles & Fields
Jun He et al.
EUROPEAN PHYSICAL JOURNAL C
(2012)
Article
Physics, Nuclear
Xu Cao et al.
Article
Physics, Particles & Fields
Su Houng Lee et al.
EUROPEAN PHYSICAL JOURNAL C
(2009)
Article
Astronomy & Astrophysics
Youchang Yang et al.
Article
Astronomy & Astrophysics
Fernando S. Navarra et al.
Article
Physics, Nuclear
J Vijande et al.
EUROPEAN PHYSICAL JOURNAL A
(2004)
Article
Astronomy & Astrophysics
MB Voloshin
Article
Physics, Multidisciplinary
E Braaten et al.
PHYSICAL REVIEW LETTERS
(2004)
Article
Astronomy & Astrophysics
BA Gelman et al.
Review
Physics, Nuclear
R Machleidt
