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Review
Physics, Multidisciplinary
Lu Meng et al.
Summary: Chiral symmetry and its spontaneous breaking are essential in both light and heavy hadron systems. Chiral perturbation theory (LPT) is an effective field theory of Quantum Chromodynamics. This paper reviews the research on chiral corrections to the properties of heavy mesons and baryons using LPT, as well as the scattering of light pseudoscalar mesons and heavy hadrons, which helps in understanding new resonances. Furthermore, this paper also discusses the progress on heavy hadronic molecular states within the framework of left, emphasizing the common chiral dynamics governing nuclei and the formation of deuteron and also the shallow bound states or resonances composed of two heavy hadrons.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
R. Aaij et al.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Gloria Montana et al.
Summary: This study investigates the properties of X(3872) and its spin partner X(4014) in both vacuum and at finite temperature. The X(3872) is dynamically generated through the s-wave rescattering of pseudoscalar and vector charm mesons, while the X(4014) is obtained from the scattering of charm vector mesons. The properties of their bottom counterparts are predicted using heavy-quark flavor symmetry. The dynamically generated states exhibit decreasing mass and increasing decay width with temperature, consistent with their meson constituents. These results have implications for relativistic heavy-ion collisions, analysis of the medium formed after hadronization, and femtoscopic studies, and can be tested in lattice-QCD calculations.
Article
Physics, Particles & Fields
Hong-Wei Ke et al.
Summary: Using the Bethe-Salpeter framework, this study investigates the possible molecular structures of D-(*()) D-(*()) and B-(*()) B-(*()) systems. The findings support the hypothesis that T-cc(+) is a molecular state of (DD)-D-0*(+) (or D*D-0(+)). Additionally, other potential molecular states are also identified.
EUROPEAN PHYSICAL JOURNAL C
(2022)
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
Physics, Particles & Fields
Luciano M. Abreu
Summary: Motivated by the tetraquark discovery, the authors revisit the Heavy-Meson Effective Theory to study possible deuteron-like and doubly charmed molecules. The potential associated with the shallow-bound DD* system is fixed using data from the tetraquark observables, and the conditions for the formation of other loosely-bound states in the doubly charmed sector are analyzed.
Article
Physics, Multidisciplinary
R. Aaij et al.
Summary: This study reported observing a hadronic state containing four quarks in the Large Hadron Collider experiment, with notable mass and resonance characteristics.
Review
Physics, Nuclear
Miguel Albaladejo et al.
Summary: The last two decades have brought numerous unexpected discoveries of new hadrons, and future experiments are expected to uncover even more surprises. Parallel theoretical efforts are necessary to understand the signals and properties of these states, along with careful amplitude modeling, statistical uncertainty treatment, and systematic investigation of model dependencies. The contributions of the Joint Physics Analysis Center to hadron spectroscopy are reviewed.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2022)
Article
Multidisciplinary Sciences
R. Aaij et al.
Summary: This study reports the discovery of a narrow exotic state in the (DD0)-D-0 pi(+) mass spectrum, which is consistent with a tetraquark state with specific quark content and spin-parity quantum numbers. The study also reveals an unexpected dependence of the production rate on track multiplicity.
NATURE COMMUNICATIONS
(2022)
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)
Review
Physics, Multidisciplinary
R. L. Workman et al.
Summary: The Review provides a comprehensive summary of particle physics and cosmology, including measurements, searches for hypothetical particles, and summaries of properties and search limits. It consists of two volumes, with Summary Tables, review articles, and Particle Listings.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2022)
Article
Astronomy & Astrophysics
Siyang Chen et al.
Summary: In this study, the S-wave DD* scattering in the isospin I = 0, 1 channels is investigated using N(f) = 2 lattice QCD method with a pion mass of about 350 MeV. It is found that the DD* interaction is repulsive in the I = 1 channel near the DD* threshold, while it is attractve in a wide range of the DD* energy in the I = 0 channel. The analysis of the DD* correlation functions indicates that the difference in the properties of I = 0, 1 DD* interactions can be attributed to the charged pion exchange effect. This observation provides direct insights into the internal dynamics of T-cc(+)(3875).
Article
Astronomy & Astrophysics
Vadim Baru et al.
Summary: In this paper, we discuss the general features of the effective range expansion, including the content of its parameters with respect to near-threshold states and the necessary modifications in the presence of coupled channels, isospin violations, and unstable constituents. As illustrative examples, we analyze the properties of the chi(c1)(3872) and T-cc(+) states, supporting the claim that these exotic states have a predominantly molecular nature.
Article
Physics, Particles & Fields
M. Albaladejo et al.
Summary: We discuss a model-independent estimator for the likelihood of compositeness of a shallow S-wave bound or virtual state. The estimator is based on an extension of Weinberg's relations and only relies on the proximity of the state's energy to the two-hadron threshold. By analyzing cases such as the deuteron, nucleon virtual state, and exotic Ds*(2317)+/-, we find strong support for the molecular interpretation in all cases, except for Ds*(2317)+/- where the method's applicability reaches its limit.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Nuclear
Yuki Kamiya et al.
Summary: We investigate the nature of T-cc and X(3872) exotic hadrons through the study of momentum correlations in high-energy collisions. Single range Gaussian potentials with channel couplings are constructed based on empirical data in the pure hadronic-molecule picture. The momentum correlation functions of various pairs are calculated with including the coupled-channel effects, and we discuss how the exotic states are reflected in the correlation results.
EUROPEAN PHYSICAL JOURNAL A
(2022)
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
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
Nico Santowsky et al.
Summary: This study investigates the internal structure of four-quark states with charm quark contributions using a two-body Bethe-Salpeter equation. The results reveal the dominant components in known quark states and propose candidates for yet unknown all-charm states.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
L. R. Dai et al.
Summary: In this study, we extended the theoretical framework to describe the T-cc state as a molecular state of D* D and made predictions for the D* D* and D-s(*) D) systems. We found that bound states only exist in the J(P) = 1+ channel. Additionally, by using input parameters to regularize the loops of the Bethe-Salpeter equation, we observed different binding energies and widths for the D*D* and D*s D-* systems.
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, Multidisciplinary
Hui Zhang et al.
Summary: Exploring the production of X(3872) in heavy ion collisions reveals the crucial role of fireball volume in distinguishing between hadronic molecules and compact tetraquarks, leading to significant differences in yield and centrality dependence. The first prediction of X(3872) elliptic flow coefficient is made for future experimental measurements.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
R. Aaij et al.
Summary: The first evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness. Additionally, narrow excited Xi(-) states have been seen for the first time in a Xi(-)(b) decay.
Article
Physics, Nuclear
Biaogang Wu et al.
Summary: The study investigates the formation and dissociation of the X(3872) particle in heavy-ion collisions through transport calculations, showing that different reaction rates significantly affect its yields and pT spectra.
EUROPEAN PHYSICAL JOURNAL A
(2021)
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
Physics, Multidisciplinary
Xiang-Kun Dong et al.
Summary: This article discusses the threshold characteristics of exotic hadrons, pointing out that only channels with attractive interactions will exhibit a threshold peak, and the width of the peak is inversely proportional to the reduced mass. Predictions are made for the possible near-threshold peaks in ground state heavy hadrons composed of heavy quarks and antiquarks with attractive interactions.
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
Physics, Nuclear
M. Albaladejo et al.
Summary: Researchers studied the behavior of X(3872) in dense nuclear matter, revealing significant nuclear corrections on the scattering matrix and resonance pole position, and discussing the dependence of these results on the molecular component in the wave function.
Review
Physics, Multidisciplinary
Nora Brambilla et al.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2020)
Article
Physics, Multidisciplinary
R. Aaij et al.
PHYSICAL REVIEW LETTERS
(2020)
Article
Astronomy & Astrophysics
R. Aaij et al.
Article
Astronomy & Astrophysics
K. Azizi et al.
Review
Physics, Nuclear
Yan-Rui Liu et al.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2019)
Article
Physics, Multidisciplinary
R. Aaij et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Astronomy & Astrophysics
A. Andronic et al.
Article
Astronomy & Astrophysics
Martin Cleven et al.
Article
Astronomy & Astrophysics
C. E. Fontoura et al.
Article
Physics, Multidisciplinary
Feng-Kun Guo et al.
REVIEWS OF MODERN PHYSICS
(2018)
Article
Physics, Particles & Fields
K. Azizi et al.
Article
Astronomy & Astrophysics
Meng-Lin Du et al.
Article
Astronomy & Astrophysics
Miguel Albaladejo et al.
Review
Physics, Nuclear
Sungtae Cho et al.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2017)
Article
Physics, Nuclear
R. Aaij et al.
Article
Astronomy & Astrophysics
L. M. Abreu et al.
Article
Physics, Multidisciplinary
R. Aaij et al.
PHYSICAL REVIEW LETTERS
(2015)
Review
Physics, Nuclear
Laura Tolos
INTERNATIONAL JOURNAL OF MODERN PHYSICS E
(2013)
Article
Physics, Nuclear
Sungtae Cho et al.
Article
Physics, Nuclear
C. Garcia-Recio et al.
Article
Astronomy & Astrophysics
O. Romanets et al.
Article
Physics, Nuclear
Sungtae Cho et al.
Article
Physics, Multidisciplinary
Sungtae Cho et al.
PHYSICAL REVIEW LETTERS
(2011)
Article
Astronomy & Astrophysics
D. Gamermann et al.
Article
Astronomy & Astrophysics
D. Gamermann et al.
Article
Astronomy & Astrophysics
C. Garcia-Recio et al.
Article
Physics, Nuclear
L. Tolos et al.
Article
Astronomy & Astrophysics
C. Garcia-Recio et al.
Article
Physics, Multidisciplinary
SK Choi et al.
PHYSICAL REVIEW LETTERS
(2003)
Article
Physics, Multidisciplinary
A Bramon et al.
PHYSICAL REVIEW LETTERS
(2002)
Article
Physics, Nuclear
J Nieves et al.
