Orbitally excited baryons in large Nc QCD

Excited baryons and heavy pentaquarks in large Nc QCD

We briefly discuss the large Nc picture for excited baryons, present a new method for the calculation of matrix elements and illustrate it by computing the strong decays of heavy exotic states. PACS. 11.15.Pg 1/Nc expansions – 14.20.-c Baryons

Excited [70, ℓ +] baryons in large Nc QCD N. Matagne a ∗ and Fl. Stancu a†

Masses of the 70 2 Baryons in Large Nc QCD

C. L. Schat,1,2 J. L. Goity,1,2 and N. N. Scoccola3,4 1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 2Department of Physics, Hampton University, Hampton, Virginia 23668 3Physics Department, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, (1429) Buenos Aires, Argentina 4Universidad Favaloro, Solís 453, (1078) Buenos Aires, Argentina (Received 7 Novem...

Orbitally Excited Baryon Spectroscopy in the 1/nc Expansion

The discussion of the 70-plet of negative parity baryons illustrates the large Nc QCD approach to orbitally excited baryons. In the case of the ` = 1 baryons the existing data allows to make numerous predictions to first order in the SU(3) symmetry breaking. New relations between splittings are found that follow from the spin-flavor symmetry breaking. The Λ(1405) is well described as a three-qu...

New relations for excited baryons in large-N(c) QCD.

We show that excited baryons in large-N(c) QCD form multiplets, within which masses are first split at O(1/N(c)). The dominant couplings of resonances to various mesons are highly constrained: The N(1535) decays at leading 1/N(c) order exclusively to eta-N rather than pi-N, and vice versa for the N(1650). This multiplet structure is reproduced by a simple large-N(c) quark model, well studied in...