Penta-quark States with Strangeness, Hidden Charm and Beauty

Abstract

The classical quenched quark models with three constituent quarks provide a good description for the baryon spatial ground states, but fail to reproduce the spectrum of baryon excited states. More and more evidences suggest that unquenched effects with multi-quark dynamics are necessary ingredients to solve the problem. Several new hyperon resonances reported recently could fit in the picture of penta-quark states. Based on this picture, some new hyperon excited states were predicted to exist; meanwhile with extension from strangeness to charm and beauty, super-heavy narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm or beauty were predicted to be around 4.3 and 11 GeV, respectively. Recently, two of such $N^{\ast }$ with hidden charm might have been observed by the LHCb experiment. More of those states are expected to be observed in near future. This opens a new window in order to study hadronic dynamics for the multi-quark states.

Talk given at the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015), Osaka, May 25--28 2015

References in corpus (25)

• Big-Bang Nucleosynthesis
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• Prediction of narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm above 4 GeV
• Identifying exotic hidden-charm pentaquarks
• How to reveal the exotic nature of the P_c(4450)
• The New Pentaquarks in the Diquark Model
• Towards exotic hidden-charm pentaquarks in QCD
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• Photoproduction of hidden charm pentaquark states $P_c^{+}(4380)$ and $P_c^{+}(4450)$
• Decay channels and charmonium mass-shifts
• DN interaction from meson exchange
• Xi and Omega baryons in the Skyrme model
• 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 ${\gamma }^{\ast }N\to N^{\ast }(1535)$
• The role of $qqqq\bar{q}$ components in the nucleon and 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
• Low-lying $\Omega$ states with negative parity in an extended quark model with Nambu-Jona-Lasinio interaction
• Role of the $N^{\ast }$(1535) in the $J/\psi \to \bar{p}\eta p$ and $J/\psi \to \bar{p}{K}^{+}\Lambda$ reactions
• Measurement of ${\pi }^0\Lambda$, ${\bar{K}}^{0}n$, and ${\pi }^0{\Sigma }^0$ production in $K^{-}p$ interactions for $p_{K^{-}}$ between 514 and 750 MeV/$c$
• Production of the superheavy baryon ${\Lambda }_{c\bar{c}}^{\ast }(4209)$ in kaon-induced reaction
• Evidence of N*(1535) resonance contribution in the pn->dϕreaction
• Three-body hadronic structure of low-lying $1/2^{+}$ $\Sigma$ and $\Lambda$ resonances
• Analysis of the Crystal Ball data on $K^{-}p\to {\pi }^0{\Sigma }^0$ reaction with center-of-mass energies of $1536\sim 1676$ MeV