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Review
Physics, Multidisciplinary
Hua-Xing Chen et al.
Summary: The past decades have seen significant advancements in hadron physics, particularly in the observation of excited open heavy flavor mesons and baryons since 2017. This review provides updated information on the recent experimental and theoretical developments in this field, including the observation of unconventional heavy hadrons, tetraquark states, and hidden heavy flavor multiquark states. Additionally, the review covers progress in understanding glueballs and light hybrid mesons, which are manifestations of the non-Abelian SU(3) gauge interaction in Quantum Chromodynamics at low energies.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Physics, Nuclear
Xiaoyun Chen et al.
Summary: This study explores bound states and low-lying resonance states of doubly-heavy tetraquark states cc (u) over bar(d) over bar (T-cc) and bb (u) over bar(d) over bar (T-bb) using a chiral quark model and accurate few-body method, Gaussian expansion method. The results reveal important findings regarding the binding energy and resonance states of these systems.
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
Astronomy & Astrophysics
M. Albaladejo
Summary: A coupled channel analysis is conducted on the D*D-+(0) and D*D-0(+) system to study the recently discovered doubly charmed T-cc(+) state by the LHCb collaboration. The study provides predictions and analysis on the properties and composition of the T-cc(+) state, as well as the possible locations of other related particles.
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
Physics, Particles & Fields
Huimin Ren et al.
Summary: Motivated by the discovery of a new tetraquark T-cc(+) with two charm quarks and two light antiquarks, this study investigates the DD* hadronic molecule interpretation of T-cc(+) and predicts possible beauty partners T-bb(10598) in future experiments.
ADVANCES IN HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Fu-Lai Wang et al.
Summary: This study systematically investigates the S-wave interactions between a pair of charmed mesons and proposes potential candidates for doubly charmed molecular tetraquark states. The authors suggest further experiments by LHCb or Belle II to search for these predicted states near the energy thresholds.
Article
Physics, Nuclear
Ulas Ozdem
Summary: This study systematically investigates the magnetic dipole moments of multiquark states and extracts the magnetic dipole moments of various states using light-cone sum rules. The results provide useful information for understanding the geometrical shapes and quark-gluon organization of hadrons.
Article
Physics, Nuclear
R. Albuquerque et al.
Summary: In this paper, improved estimates of the couplings, masses, and mass ratios of different states are presented using various methods. The study includes the inclusion of NLO factorized PT QCD corrections and focuses on the tetramole states and four-quark nature of the particles. The results show the importance of combined Rand DRSR in providing precise predictions.
Article
Physics, Particles & Fields
S. S. Agaev et al.
Summary: In this study, the doubly charmed four-quark meson Tcc(+) is explored by treating it as a hadronic molecule Mcc+(DD)-D0*(+), calculating its mass, current coupling, and width. The calculated mass exceeds the two-meson threshold, allowing decay to conventional mesons kinematically. The width of the decay is evaluated using the strong coupling G found at the vertex.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
L. M. Abreu et al.
Summary: We studied the evolution and influence of the doubly charmed state T-cc(+) in a hot hadron gas produced in late-stage heavy-ion collisions, comparing its yield as a hadronic S-wave molecule and as a tetraquark state. Our results show an increase in the tetraquark yield, but it is still much smaller than the yield of molecules formed from hadron coalescence.
Article
Astronomy & Astrophysics
Ulas Ozdem
Summary: The magnetic moments of vector hidden-charmed tetraquark states are determined using light-cone sum rules, and their consistency can be checked by various methods. The magnetic moments of hadrons provide useful knowledge about their geometrical shapes.
Article
Physics, Particles & Fields
Kan Chen et al.
Summary: In this study, a unified description of molecular systems composed of heavy flavor hadrons is given using quark level interaction. The observed states are reproduced and a new state is predicted. The isospin criterion is proposed to explain the preference for lower isospin numbers in molecular candidates.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
T. M. Aliev et al.
Summary: Motivated by the recent discovery of a new tetraquark T-cc(+) state, this study calculates the spectroscopic parameters of the beauty partners of T-cc(+) using QCD sum rules. The obtained results are compared with predictions from different approaches in the literature.
Article
Physics, Nuclear
Qi Xin et al.
Summary: In this study, we investigated the properties of scalar, axialvector, and tensor doubly-charmed tetraquarks without strange, with strange, and with doubly-strange using QCD sum rules. We also provided a possible assignment for the T-cc(+) particle based on the molecular states scenario. The predictions suggest that the lighter DD* molecular state with specific spin-parity and isospin characteristics is the T-cc(+), while the heavier DD* molecular state remains undetected.
EUROPEAN PHYSICAL JOURNAL A
(2022)
Article
Astronomy & Astrophysics
Yonghee Kim et al.
Summary: The energy spectrum of doubly heavy tetraquarks, TQQ (QQq??q?? with Q = c, b and q = u, d, s), is investigated in the potential chiral-diquark model. The Tbb, Tcc, and Tcb tetraquarks are described as a three-body system composed of two heavy quarks and an antidiquark. Several Tbb bound states are found, and the change of TQQ tetraquark masses under restoration of chiral symmetry is also studied.
Article
Astronomy & Astrophysics
Ling-Yun Dai et al.
Summary: The scattering amplitudes of (DD0)-D-0 pi(+)- D*D-+(0) coupled channels are studied in this paper using the K matrix and the Chew-Mandelstam formalism. The (DD0)-D-0 pi(+) invariant mass spectrum of LHCb is fitted and the pole parameters of T-cc(+) are extracted. The analysis suggests that T-cc(+) may originate from a virtual state of D*D-+(0) and form due to the attractive interaction between D-0 and D*(+) and the coupling to the (DD0)-D-0 pi(+) channel.
Article
Astronomy & Astrophysics
Chengrong Deng et al.
Summary: This paper systematically investigates doubly heavy tetraquark states with a molecule configuration in a nonrelativistic quark model. The results show that meson-exchange interactions and coupled channel effects play a crucial role in the formation and properties of these states.
Article
Physics, Particles & Fields
L. M. Abreu et al.
Summary: In this study, we calculate the cross sections of various processes related to T-cc(+)pi and T-cc(+)rho -> D-(*()) D-(*()) reactions. We employ effective Lagrangians and QCD sum rules to calculate the form factors and find that the absorption cross sections are larger than the production ones. We compare our results with a previous estimate and observe a significant difference, with our cross sections being one order of magnitude smaller.
EUROPEAN PHYSICAL JOURNAL C
(2022)
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
Physics, Nuclear
S. S. Agaev et al.
Summary: The spectroscopic parameters and decay channels of the axial-vector tetraquark T-bb;(us) over bar(-) are explored using the quantum chromodynamics (QCD) sum rule method. The mass and coupling of this state are calculated and it is stable with respect to strong and electromagnetic decays, dissociating to conventional mesons only via weak transformations. Investigating the dominant semileptonic and nonleptonic decays provides valuable information for experimental investigations of these double-heavy exotic mesons.
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.
Article
Astronomy & Astrophysics
Q. Meng et al.
Summary: In this study, bound states of double-heavy tetraquarks are investigated using a constituent quark model. Two bound states with different properties are found in the bbud channel, one being deeply bound and compact made of colored diquarks, while the other is shallow and extended as a BB* molecule. By replacing one heavy quark with a lighter one, a systematic decrease in binding energy is observed, leading to the discovery of a total of ten bound states. It is the first time that hadrons with completely different natures have emerged from a single Hamiltonian.
Article
Physics, Nuclear
Zhi-Gang Wang
Summary: The study utilized scalar and axialvector diquark operators to construct four-quark currents and investigated diquark-antidiquark type axialvector tetraquark states. The predicted tetraquark mass closely matched the experimental value, supporting the identification of Z(cs)(3985) as a relative of Z(c)(3900). Consideration of flavor mass-breaking effect was included in estimating the mass spectrum of diquark-antidiquark type hidden-charm tetraquark states with strangeness.
Article
Physics, Nuclear
S. S. Agaev et al.
Summary: In this study, the semileptonic and nonleptonic decays of the double-beauty axial-vector tetraquark T-bb are investigated using the QCD sum rule method. The spectroscopic parameters of the final-state tetraquark are calculated, and the partial widths of the dominant decays are computed in terms of weak form factors. The predictions obtained for the partial widths of the decays are used to improve the theoretical accuracy of the full width and lifetime of the tetraquark T-bb, which are crucial for experimental exploration.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Review
Physics, Nuclear
Wolfgang Lucha et al.
Summary: The study reviews the application of the large-Nc approach to the tetraquark states, exploring the differences in internal structure between multiquark states and ordinary hadrons, as well as the mechanisms of tetraquark state formation. Analyzing the energy balance of various schemes in the static limit provides clarification on the mechanisms at work in the formation of tetraquarks.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2021)
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
Fu-Lai Wang et al.
Summary: The investigation using the one-boson exchange model suggests that specific S-wave charmed meson states with certain I(JP) values are promising candidates for doubly charmed molecular tetraquark states. With the accumulation of experimental data at Run III and a High-Luminosity LHC upgrade, these predicted states could potentially be observed at LHCb in the near future.
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
Yi Jin et al.
Summary: This study suggests investigating the production mechanism and properties of the recently observed T-cc resonance to probe its structure. The similarity between T-cc and Xi(cc) can be determined by examining their production properties and kinematics spectra. Additionally, measuring the momentum correlation of DD* can help determine if T-cc is produced as a hadron molecule. The current cross-section calculations using a nonrelativistic hadron molecule model are significantly lower than experimental measurements.
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
R. M. Albuquerque et al.
Summary: This study presents a global analysis of observed Z(c), Z(cs), and future Z(css)-like spectra using inverse Laplace sum rule within stability criteria, giving integrated compact QCD expressions of spectral functions and including next-to-leading order perturbative contributions. It emphasizes the importance of including perturbative radiative corrections for heavy quark sum rules. The results suggest that the two-meson scattering contributions to four-quark spectral functions are numerically negligible, confirming the reliability of the Laplace sum rule predictions.
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.
Review
Physics, Multidisciplinary
Nora Brambilla et al.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2020)
Article
Physics, Nuclear
Zhi-Gang Wang et al.
Article
Physics, Nuclear
Zhi-Gang Wang
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2020)
Article
Astronomy & Astrophysics
Protick Mohanta et al.
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Astronomy & Astrophysics
R. M. Albuquerque et al.
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Zhi-Gang Wang
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Shahin Agaev et al.
TURKISH JOURNAL OF PHYSICS
(2020)
Article
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H. Sundu et al.
EUROPEAN PHYSICAL JOURNAL C
(2019)
Review
Physics, Nuclear
Yan-Rui Liu et al.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2019)
Article
Astronomy & Astrophysics
Wolfgang Lucha et al.
Article
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Stephen Lars Olsen et al.
REVIEWS OF MODERN PHYSICS
(2018)
Review
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A. Esposito et al.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2017)
Review
Physics, Nuclear
Richard F. Lebed et al.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2017)
Review
Physics, Nuclear
Ahmed Ali et al.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2017)
Review
Physics, Multidisciplinary
Hua-Xing Chen et al.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2016)
Article
Physics, Nuclear
Zhi-Gang Wang
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2015)
Review
Physics, Nuclear
Angelo Esposito et al.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2015)
Article
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Steven Weinberg
PHYSICAL REVIEW LETTERS
(2013)
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J. M. Dias et al.
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Physics, Multidisciplinary
Marina Nielsen et al.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
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PHYSICAL REVIEW LETTERS
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SH Lee et al.
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PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
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