1/N Expansion for Exotic Baryons

Abstract

The 1/N expansion for exotic baryons is developed, and applied to the masses, meson couplings and decay widths. Masses and widths of the 27 and 35 pentaquark states in the same tower as the Theta+ are related by spin-flavor symmetry. The 27 and 35 states can decay within the pentaquark tower, as well as to normal baryons, and so have larger decay widths than the lightest pentaquark Theta. The 1/N expansion also is applied to baryon exotics containing a single heavy antiquark. The decay widths of heavy pentaquarks via pion emission, and to normal baryons plus heavy D^(*),B^(*) mesons are studied, and relations following from large-N spin-flavor symmetry and from heavy quark symmetry are derived.

Major additions: plots of widths and branching ratios, discussion of strong decays of heavy pentaquarks, including consequences of heavy quark symmetry

References in corpus (5)

• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• Experimental Limits on the Width of the Reported Theta(1540)+
• Stable Heavy Pentaquark States
• The width of ${\Theta }^{+}$ for large $N_c$ in chiral quark soliton model

Cited by in corpus (17)

• SU(N) gauge theories at large N
• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Pentaquark baryons in SU(3) quark model
• On the Existence of Heavy Pentaquarks: The large Nc and Heavy Quark Limits and Beyond
• Color Non-Singlet Spectroscopy
• SU(3) Clebsch-Gordan Coefficients for Baryon-Meson Coupling at Arbitrary N_c
• Negative-Parity Heavy Pentaquark States in 1/N_c
• Negative parity pentaquarks in large Nc QCD and quark model
• SU(3) Baryon Resonance Multiplets in Large N_c QCD
• Baryon resonances in large $N_c$ QCD
• Light-Front Approach for Pentaquark Strong Decays
• Phenomenology of spin 3/2 baryons with pentaquarks
• Moments of inertia, nucleon axial-vector coupling, the {\bf 8}, {\bf 10}, $\overline{10}$ and ${27}_{3/2}$ mass spectrums and the higher SU(3)_f representation mass splittings in the Skyrme model
• Occupation number formalism for arbitrary Nc baryons
• Positive parity pentaquark towers in large Nc QCD
• The Skyrme model predictions for the ${27}_{J=3/2}$ mass spectrum and the ${27}_{3/2}$-$\overline{10}$ mass splittings
• Excited baryons and heavy pentaquarks in large Nc QCD