Dibaryons: Molecular versus Compact Hexaquarks

Abstract

Hexaquarks constitute a natural extension of complex quark systems like also tetra- and pentaquarks do. To this end the current status of $d^{\ast }(2380)$ in both experiment and theory is shortly reviewed. Recent high-precision measurements in the nucleon-nucleon channel and analyses thereof have established $d^{\ast }(2380)$ as an indisputable resonance in the long-sought dibaryon channel. Important features of this $I(J^P)=0(3^{+})$ state are its narrow width and its deep binding relative to the $\Delta (1232)\Delta (1232)$ threshold. Its decay branchings favor theoretical calculations predicting a compact hexaquark nature of this state. We review the current status of experimental and theoretical studies on $d^{\ast }(2380)$ as well as new physics aspects it may bring in the future. In addition, we review the situation at the $\Delta (1232)N$ and $N^{\ast }(1440)N$ thresholds, where evidence for a number of resonances of presumably molecular nature have been found -- similar to the situation in charmed and beauty sectors. Finally we briefly discuss the situation of dibaryon searches in the flavored quark sectors.

References in corpus (85)

• Probing Cold Dense Nuclear Matter
• Evidence for the Strong Dominance of Proton-Neutron Correlations in Nuclei
• ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?
• Updated analysis of NN elastic scattering to 3 GeV
• Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements
• Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV
• Evidence for a New Resonance from Polarized Neutron-Proton Scattering
• $\Lambda \Lambda$ and N$\Xi$ interactions from Lattice QCD near the physical point
• Most Strange Dibaryon from Lattice QCD
• Isospin Decomposition of the Basic Double-Pionic Fusion in the Region of the ABC Effect
• Novel Six-Quark Hidden-Color Dibaryon States in QCD
• Three-body calculation of the Delta-Delta dibaryon candidate D(03) at 2.37 GeV
• Three-body model calculations of Nucleon-Delta and Delta-Delta dibaryon resonances
• Double pion photoproduction on nucleon and deuteron
• Origin of the low-mass electron pair excess in light nucleus-nucleus collisions
• Spin-2 $N\Omega$ Dibaryon from Lattice QCD
• Possible Deuteron-like Molecular States Composed of Heavy Baryons
• Deltaron Dibaryon Structure in Chiral SU(3) Quark Model
• Quark models of dibaryon resonances in nucleon-nucleon scattering
• Measurement of the $pn\to pp{\pi }^0{\pi }^{-}$ Reaction in Search for the Recently Observed Resonance Structure in $d{\pi }^0{\pi }^0$ and $d{\pi }^{+}{\pi }^{-}$ systems
• Neutron-Proton Scattering in the Context of the $d^{\ast }$(2380) Resonance
• Measurement of the $np\to np{\pi }^0{\pi }^0$ Reaction in Search for the Recently Observed $d^{\ast }(2380)$ Resonance
• Dibaryon Systems In SU(3) Chira Quark Model
• Hadronic Molecular States Composed of Heavy Flavor Baryons
• Observation of Two New N* Peaks in J/psi -> $pp{i}^{-}\bar{n}$ and $\bar{p}{\pi }^{+}n$ Decays
• Dibaryons in a constituent quark model
• Two-Pion Production in Proton-Proton Collisions -- Experimental Total Cross Sections and their Isospin Decomposition
• QCD sum rule Study of the $d^{\ast }(2380)$
• Exclusive Measurements of $pd{\to }^{3}He\pi \pi$ : the $ABC$ Effect Revisited
• ${\Lambda }_{c}N$ interaction from lattice QCD and its application to ${\Lambda }_c$ hypernuclei
• A study of $d^{\ast }(2380)\to d\pi \pi$ decay width
• ABC effect as a signal of chiral symmetry restoration in hadronic collisions
• Deuteron-like states composed of two doubly charmed baryons
• Decay width of $d^{\ast }(2380)\to NN\pi \pi$ processes
• The $d^{\ast }$(2380) dibaryon resonance width and decay branching ratios
• Hidden dibaryons in one- and two-pion production in NN collisions
• Scattering of decuplet baryons in chiral effective field theory
• First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV
• The $d^{\ast }(2380)$ in neutron stars - a new degree of freedom?
• Non-strange Dibaryon Resonances Observed in the $\gamma d\to {\pi }^0{\pi }^{0}d$ Reaction
• ABC Effect and Resonance Structure in the Double-Pionic Fusion to ${}^3$He
• ABC Resonance Structure in the Double-Pionic Fusion to 4He
• Decay width of $d^{\ast }(2380)\to NN\pi$ process in a chiral constituent quark model
• Search for doubly-heavy dibaryons in a quark model
• Heavy flavor dibaryons
• Bound States of Heavy Flavor Hyperons
• On a Possible Explanation of the DLS-Puzzle
• Experimental and theoretical evidences for an intermediate $\sigma$-dressed dibaryon in the NN interaction
• Nucleon-nucleon interaction in a chiral SU(3) quark model revisited
• Constraints on a possible dibaryon from combined analysis of the $pn\to d{\pi }^{+}{\pi }^{-}$ and $pn\to pn{\pi }^{+}{\pi }^{-}$ cross sections
• Estimation of the ratio of the pn -> pn pi0 pi0/pn -> d pi0 pi0 cross sections
• Single-Pion Production in pp Collisions at =.95 GeV/c (I)
• Study of the $\Lambda p$ Interaction Close to the ${\Sigma }^{+}n$ and ${\Sigma }^{0}p$ Thresholds
• Measurement of the $\vec{n}p\to d{\pi }^0{\pi }^0$ Reaction with Polarized Beam in the Region of the $d^{\ast }(2380)$ Resonance
• Nature of $\mathbf{S}$-wave $\mathbf{NN}$ interaction and dibaryon production at nucleonic resonance thresholds
• Possible hadronic molecules composed of the doubly charmed baryon and nucleon
• Determination of N* amplitudes from associated strangeness production in p+p collisions
• On the width of N-Delta and Delta-Delta states
• On the SigmaN cusp in the pp -> pK+Lambda reaction
• Deuteron photodisintegration by polarized photons in the region of the $d^{\ast }(2380)$
• Signatures of the $d^{\ast }(2380)$ hexaquark in d($\gamma$,$p\vec{n}$)
• $d^{\ast }(2380)$ dibaryon from lattice QCD
• Manifestation of the $P$-wave diproton resonance in single-pion production in $pp$ collisions
• Coherent pi0-pi0 photoproduction on lightest nuclei
• Search for an Isospin I =3 Dibaryon
• Properties of single cluster structure of $d^{\ast }(2380)$ in chiral SU(3) quark model
• A new possibility for light-quark Dark Matter
• Six-quark structure of $d^{\ast }(2380)$ in chiral constituent quark model
• An Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction?
• $d^{\ast }(2380)$ and its partners in a diquark model
• On the charge distribution of $d^{\ast }(2380)$
• Possible Molecular States Composed of Doubly Charmed Baryons with Couple-channel Effect
• Hadronic Molecular States Composed of Spin-$\frac{3}{2}$ Singly Charmed Baryons
• From CELSIUS to COSY: on the observation of a dibaryon resonance
• Neutron star matter equation of state including $d^{\ast }$-hexaquark degrees of freedom
• Possible existence of a dibaryon candidate $N\Delta$ ($D_{21}$)
• Charmed dibaryon resonances in the potential quark model
• Possible $\Delta \Delta$ dibaryons in the quark cluster model
• Photo-absorption on deuteron contributed by d^*(2380) resonance
• Electromagnetic properties of the $d^{\ast }(2380)$ hexaquark
• Theoretical study of a $d^{\ast }$ resonance in ${}^3{G}_3$ partial wave of nucleon-nucleon scattering
• Differential Cross Sections for Neutron-Proton Scattering in the Region of the $d^{\ast }(2380)$ Dibaryon Resonance
• $P$-wave dibaryon resonances in $pp$ elastic scattering and near-threshold pion production
• A diquark model for the d*(2380) dibaryon resonance?
• On the Production of an Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction

Cited by in corpus (13)

• 50 Years of Quantum Chromodynamics
• Triangle singularity mechanism for the $pp\to {\pi }^{+}d$ fusion reaction
• Diffusion Monte Carlo calculations of fully-heavy compact hexaquarks
• Evidence of a dibaryon spectrum in coherent ${\pi }^0{\pi }^{0}d$ photoproduction at forward deuteron angles
• Sequential single pion production explaining the dibaryon "$d^{\ast }(2380)$" peak
• Reply to "Comment on Sequential Single-pion Production Explaining the dibaryon $d^{\ast }(2380)$ peak''
• Search for the charmed baryonium and dibaryon structures via the QCD sum rules
• Systematics of fully heavy dibaryons
• Reveal short range interactions between $u/d$ quarks in the $NN$, $D_{03}$, and $D_{30}$ systems
• Isospin symmetry breaking in double-pion production in the region of $d^{\ast }(2380)$ and the scalar $\sigma$ meson
• Is $d^{\ast }(2380)$ a compact hexaquark state?
• Possible dibaryon production at $\bar{\mathrm{P}}$anda with a Lagrangian approach
• Prospects for compact hexaquarks under the limitation imposed by quark confinement