Tetraquarks, Pentaquarks and Dibaryons in the large $N$ QCD

Abstract

We study the multiquark hadrons in large $N$ QCD under the 't-Hooft limit, extending Witten's picture of the baryons. We explore the decay widths of tetraquarks, pentaquarks and dibaryons. Based on the decay behaviors, we point out in the $N\to \infty$ limit decay widths of tetraquarks stay constant, while those of pentaquarks and dibaryons above certain thresholds can diverge. In the large $N$ limit, we find that the ground states of the three spectroscopic series are stable or narrow and that the excited states of pentaquarks and dibaryons above the indicated thresholds are not observables. We compare our results with those obtained in a different large $N$ generalization of tetraquarks.

9 pages, 6 figures; v2: discussions on phase space added in the appendix

References in corpus (12)

• Multiquark Resonances
• Exotics: Heavy Pentaquarks and Tetraquarks
• Discovery of doubly-charmed Xi_{cc} baryon implies a stable (b b ubar dbar) tetraquark
• Heavy-quark symmetry implies stable heavy tetraquark mesons $Q_i{Q}_j{\bar{q}}_k{\bar{q}}_l$
• Four-Quark Hadrons: an Updated Review
• A Theory of X and Z Multiquark Resonances
• Are There Tetraquarks at Large $N_c$ in QCD(F)?
• Narrow exotic tetraquark mesons in large-$N_c$ QCD
• Non-ordinary light meson couplings and the $1/N_c$ expansion
• Re-examining the $X(4630)$ resonance in the reaction $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$
• Baryonium, tetra-quark state and glue-ball in large N_c QCD
• Tetraquark and two-meson states at large $N_{\mathrm{c}}$

Cited by in corpus (8)

• Tetraquarks in large-$N_c$ QCD
• Interpretation of $Y_b(10750)$ as a tetraquark and its production mechanism
• Radial and orbital Regge trajectories in heavy quarkonia
• Weak Decays of Triply Heavy Tetraquarks $b\bar{c}b\bar{q}$
• Cluster reducibility of multiquark operators
• Do near-threshold molecular states mix with neighbouring $\bar{Q}Q$ states?
• The Production of Singly Charmed Pentaquark $\bar{c}qqqq$ from Bottom Baryon
• OPE and quark-hadron duality for two-point functions of tetraquark currents in $1/N_c$ expansion