Hybrid and Conventional Baryons in the Flux-Tube Model

Details Hybrid and Conventional Baryons in the Flux-Tube Model Hybrid and Conventional Baryons in the Flux-Tube Model

2002-07-11

arxiv.org/abs/nucl-th/0207027v2

Phys.Rev. C66 (2002) 065204

Physics

Nuclear Physics

Nuclear Theory

43 pages, 11 figures, version published in Physical Review C

Scientific paper

10.1103/PhysRevC.66.065204

Conventional and hybrid light quark baryons are constructed in the non-relativistic flux-tube model of Isgur and Paton, which is motivated by lattice QCD. The motion of the flux tube with the three quark positions fixed, except for center of mass corrections, is discussed. It is shown that the problem can be reduced to the independent motion of the junction and the strings connecting the junction to the quarks. The important role played by quark-exchange symmetry in constraining the flavor structure of (hybrid) baryons is emphasized. The flavor, quark spin S, total spin J, and parity P of the seven low-lying hybrid baryons are found to be N2(1/2)+, N2(3/2)+, Delta4(1/2)+, Delta4(3/2)+, and Delta4(5/2)+, where the notation is flavor[2S+1](J)P, and the N2(1/2)+ and N2(3/2)+ states are doublets. The motion of the three quarks in an adiabatic potential derived from the flux-tube dynamics is considered. A mass of 1870 +/- 100 MeV for the lightest nucleon hybrids is found by employing a variational method.

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