Positive parity pentaquark towers in large Nc QCD

Abstract

We construct the complete set of positive parity pentaquarks, which correspond in the quark model to {\bar s} q^{Nc+1} states with one unit of orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2 and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive predictions for the mass spectrum and the axial couplings of these states at leading order in 1/Nc. The strong decay width of the lowest-lying positive parity exotic state is of order O(1/Nc), such that this state is narrow in the large Nc limit. Replacing the antiquark with a heavy antiquark {\bar Q} q^{Nc+1}, the two towers become degenerate, split only by O(1/mQ) hyperfine interactions. We obtain predictions for the strong decay widths of heavy pentaquarks to ordinary baryons and heavy H(*)_{\bar Q} mesons at leading order in 1/Nc and 1/mQ.

arXiv comment21 pages, 2 figures, 5 tables

References in corpus (93)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Diquarks and Exotic Spectroscopy
• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• Exotica
• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• The 1/N Expansion for Baryons
• Evidence for the positive-strangeness pentaquark ${\Theta }^{+}$ in photoproduction with the SAPHIR detector at ELSA
• Observation of an Exotic S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS
• Baryon-Pion Couplings from Large-N QCD
• Spin-Flavor Structure of Large N Baryons
• Observation of an Exotic Baryon with S=+1 in Photoproduction from the Proton
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• 1/N Corrections to the Baryon Axial Currents in QCD
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment
• Evidence for formation of a narrow pKshort resonance with mass near 1533 MeV in neutrino interactions
• Baryons from Quarks in the $1/N$ Expansion
• On Spin Independence in Large $N_c$ Baryons
• Evidence for a Narrow Anti-Charmed Baryon State
• Baryon Hyperfine Mass Splittings in Large N QCD
• K+ nucleon scattering and exotic S=+1 Baryons
• Heavy Baryon Masses in the $1/m_Q$ and $1/N_c$ Expansions
• Masses of the 70- Baryons in Large Nc QCD
• Experimental Limits on the Width of the Reported Theta(1540)+
• Baryon Magnetic Moments in a Simultaneous Expansion in $1/N$ and $m_s$
• Search for the Pentaquark State in $\psi (2S)$ and $J/\psi$ Decays to $K_S^{0}p{K}^{-}\bar{n}$ and $K_S^0\bar{p}{K}^{+}n$
• Operator Analysis of L=1 Baryon Masses in Large N_c QCD
• Search for the ${\Theta }^{+}$ pentaquark in the reaction $\gamma d\to p{K}^{-}{K}^{+}n$
• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners
• Light Quark Spin-Flavor Symmetry for Baryons Containing a Heavy Quark in Large N QCD
• Large N_c Limit of Spin-Flavor Breaking in Excited Baryon Levels
• Masses of Orbitally Excited Baryons in Large N_c QCD
• Negative Parity 70-plet Baryon Masses in the 1/Nc Expansion
• Search for ${\Theta }^{+}(1540)$ pentaquark in high statistics measurement of $\gamma p\to {\bar{K}}^0{K}^{+}n$ at CLAS
• Baryon Magnetic Moments in the 1/N Expansion
• Analysis of the [56,2^+] Baryon Masses in the 1/Nc Expansion
• Influence of a Z+(1540) resonance on K+N scattering
• Is Theta+(1540) a Kaon--Skyrmion Resonance?
• $1/N_c$ Expansion for Excited Baryons
• Limits for the central production of Theta^+ and Xi^{--} pentaquarks in 920 GeV pA collisions
• Excited Baryons Phenomenology from Large-$N_c$ QCD
• Study of the Baryon-Antibaryon Low-Mass Enhancements in Charmless Three-body Baryonic B Decays
• New results on the limit for the width of the exotic Theta^+ resonance
• 1/Nc corrections to the SU(4)_c symmetry for L=1 baryons: The Three Towers
• The $[56,4^{+}]$ baryons in the $1/N_c$ expansion
• New Relations for Excited Baryons in Large N_c QCD
• Hyperfine Mass Splittings of Baryons Containing a Heavy Quark in Large N QCD
• Search for the ${\Theta }^{+}$ pentaquark in the reactions $\gamma p\to {\bar{K}}^0{K}^{+}n$ and $\gamma p\to {\bar{K}}^0{K}^{0}p$
• Search for Theta(1540)^+ in exclusive proton-induced reaction p+C(N) \to Theta^+ \bar{K}^0 + C(N) at the energy of 70 GeV
• The pentaquark in K-plus-d total cross section data
• Delta --> N gamma in Large-Nc QCD
• Partners of the Theta^+ in Large N_c QCD
• Excited Baryons in Large N_c QCD Revisited: The Resonance Picture Versus Single-Quark Excitations
• High Statistics Search for the Theta+(1.54) Pentaquark State
• Masses of $[70,{\ell }^{+}]$ Baryons in the $1/N_c$ Expansion
• Pentaquark Searches at CDF
• Stable Heavy Pentaquark States
• Search for Theta+ via pi- p --> K- X reaction near production threshold
• Search for the Theta+ pentaquark in the gamma d -> Lambda n K+ reaction measured with CLAS
• The width of ${\Theta }^{+}$ for large $N_c$ in chiral quark soliton model
• Search for a narrow charmed baryonic state decaying to D^*+/- p^-/+ in ep collisions at HERA
• Observation of narrow baryon resonance decaying into $p{K}_s^0$ in pA-interactions at $70GeV/c$ with SVD-2 setup
• Search for the exotic ${\Xi }^{--}(1860)$ Resonance in 340GeV/c ${\Sigma }^{-}$-Nucleus Interactions
• Bound State versus Collective Coordinate Approaches in Chiral Soliton Models and the Width of the ${\Theta }^{+}$ Pentaquark
• Baryon Exotics in the Quark Model, the Skyrme Model and QCD
• On the Existence of Heavy Pentaquarks: The large Nc and Heavy Quark Limits and Beyond
• Decays of Non-strange Negative Parity Baryons in the 1/Nc Expansion
• Excited $[70,{\mathbf{\ell }}^{+}]$ baryons in large $N_c$ QCD
• The theta^+ baryon in soliton models: large Nc QCD and the validity of rigid-rotor quantization
• Search for an exotic S=-2, Q=-2 baryon resonance at a mass near 1862 MeV in quasi-real photoproduction
• Pentaquark Searches in Electron-Positron Annihilations and Two-Photon Collisions at LEP
• CKM Results From CLEO
• Spin 3/2 Pentaquark Resonance Signature in Lattice QCD
• Search for a strongly decaying neutral charmed pentaquark
• Spin 3/2 Penta-quarks in anisotropic lattice QCD
• 1/N Expansion for Exotic Baryons
• Phenomenology of the Baryon Resonance 70-plet at Large N_c
• Negative-Parity Heavy Pentaquark States in 1/N_c
• Negative parity pentaquarks in large Nc QCD and quark model
• Search for a pentaquark decaying to p K_S^0
• On the determination of the parity of the ${\Theta }^{+}$
• Search for the pentaquark candidate ${\Theta }^{+}$(1540) in the hyperon beam experiment WA89
• Search for the Charmed Pentaquark Candidate Theta_c(3100) in e+e- Annihilations at sqrt(s)=10.58 GeV
• Search for Exotic Baryons in 800 GeV pp (rtarrow) pXiPiX
• Determining Pentaquark Quantum Numbers from Strong Decays
• Hybrid Baryons in Large-N_c QCD
• Recent Results on Searches for Pentaquark States from STAR at RHIC
• Anti-charmed pentaquark from B decays
• $1/m_Q$ and $1/N_c$ Expansions for Excited Heavy Baryons with Light Quarks in the Spin-Flavor Symmetric Representation
• A Review of Pentaquark Calculations on the Lattice
• Baryon Spectrum in Large N(C) Chiral Soliton and in Quark Models
• Occupation number formalism for arbitrary Nc baryons

Cited by in corpus (2)

• Baryon resonances in large $N_c$ QCD
• The permutation group S_N and large Nc excited baryons