Five-quark components in baryons

Abstract

Evidence has been accumulating for the existence of significant intrinsic non-perturbative five-quark components in various baryons. The inclusion of the five-quark components gives a natural explanation of the excess of $\bar{d}$ over $\bar{u}$, significant quark orbital angular momentum in the proton, the problematic mass and decay pattern of the lowest $1/2^{-}$ baryon nonet, etc.. A breathing mode of $qqq\leftrightarrow qqqq\bar{q}$ is suggested for the lowest $1/2^{-}$ baryon octet. Evidence of a predicted member of the new scheme, ${\Sigma }^{\ast }(1/2^{-})$ around 1380 MeV, is introduced.

invited plenary talk at the 10th International Conference on Hypernuclear and Strange Particle Physics (HypX09) September 14th - 18th, 2009, Tokai, Ibaraki, Japan

References in corpus (20)

• Comment on "Mass and K Lambda coupling of N*(1535)"
• Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q**2=0.22 (GeV/c)**2
• Nucleon and Delta resonances in K Sigma(1385) photoproduction from nucleons
• The role of $N^{\ast }(1535)$ in $pp\to pp\varphi$ and ${\pi }^{-}p\to n\varphi$ reactions
• Evidence for a new ${\Sigma }^{\ast }$ resonance with $J^P=1/2^{-}$ in the old data of $K^{-}p\to \Lambda {\pi }^{+}{\pi }^{-}$ reaction
• The role of the $qqqq\bar{q}$ components in the electromagnetic transition ${\gamma }^{\ast }N\to N^{\ast }(1535)$
• Further evidence for the ${\Sigma }^{\ast }$ resonance with $J^P=1/2^{-}$ around 1380 MeV
• The role of $qqqq\bar{q}$ components in the nucleon and the N(1440) resonance
• The role of ${\Delta }^{++\ast }(1620)$ resonances in $pp\to n{K}^{+}{\Sigma }^{+}$ reaction and its important implications
• The role of $q\bar{q}$ components in the N(1440) resonance
• Cross Sections and Beam Asymmetries for K+ Sigma*- photoproduction from the deuteron at 1.5-2.4 GeV
• The role of $N^{\ast }(1535)$ in ${\eta }^{\prime }$ production
• Role of the $N^{\ast }$(1535) in the $J/\psi \to \bar{p}\eta p$ and $J/\psi \to \bar{p}{K}^{+}\Lambda$ reactions
• Evidence of N*(1535) resonance contribution in the pn->dϕreaction
• Phenomenology of the Lambda/Sigma^0 production ratio in pp collisions
• Strangeness in the proton and N*(1535)
• The small axial charge of the N(1535) resonance
• The s-s(bar) asymmetry in nucleon and "NuTeV anomaly"
• Dynamically generated resonances
• Single spin asymmetry and five-quark components of the proton

Cited by in corpus (33)

• Prediction of narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm above 4 GeV
• Nucleon Resonances with Hidden Charm in Coupled-Channel Models
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• Prediction of super-heavy $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden beauty
• A possible global group structure for exotic states
• Triangular singularity and a possible $\varphi p$ resonance in the ${\Lambda }_c^{+}\to {\pi }^0\varphi p$ decay
• Electromagnetic Transition Form Factors of Baryon Resonances
• Hadron spectroscopy from strangeness to charm and beauty
• Strong decay of low-lying $S_{11}$ and $D_{13}$ nucleon resonances to pseudoscalar mesons and octet baryons
• Review of the low-lying excited baryons ${\Sigma }^{\ast }(1/2^{-})$
• Associated strangeness production in the pp to pK^+K^-p and pp to pK^+ pi^0 Sigma^0 reactions
• Role of five-quark components in radiative and strong decays of the Lambda(1405) resonance
• $\Sigma$ Resonances from $K^{-}N\to \pi \Lambda$ reactions with the center of mass energy from 1550 to 1676 MeV
• Production of the superheavy baryon ${\Lambda }_{c\bar{c}}^{\ast }(4209)$ in kaon-induced reaction
• Role of the $N^{\ast }(1535)$ in the ${\Lambda }_c^{+}\to {\bar{K}}^0\eta p$ decay
• Coupling strength of the $N^{\ast }(1535)S_{11}$ to the $K^{+}\Lambda$ channel
• $P_c$-like pentaquarks in hidden strange sector
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• Isospin Decomposition of the Photoproduced Σπ System Near the Λ(1405)
• Nucleon resonances in the $\gamma p\to \varphi K^{+}\Lambda$ reaction near threshold
• Gravitational form factors of $N(1535)$ in QCD
• Study ${\Xi }_c^{+}\to \Lambda {\bar{K}}^0{\pi }^{+}$ and search for the low-lying baryons $\Xi (1/2^{-})$ and $\Sigma (1/2^{-})$
• Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory
• The production of neutral $N^{\ast }(11052)$ resonance with hidden beauty from ${\pi }^{-}p$ scattering
• Quark model study of the $\pi N\to \pi N$ reactions up to the $N(1440)$ resonance region
• Principles for a unified picture of fermions
• The odd-parity strange baryons $\Sigma ({\frac{1}{2}}^{-})$ below 1.8 GeV with Hamiltonian effective field theory
• Analysis of ${\Sigma }^{\ast }$ via isospin selective reaction $K_{L}p\to {\pi }^{+}{\Sigma }^0$
• Estimating proton radius and proportion of other non-perturbative components in the proton by the Maximum Entropy Method
• $\Xi$(2030) and $\Xi$(2120) as ${\bar{K}}^{\ast }\Sigma$ molecular states
• Penta-quark states with hidden charm and beauty
• Helicity amplitudes of $N(1520)$ and $N(1535)$ including pentaquark components
• Penta-quark States with Strangeness, Hidden Charm and Beauty