The SU(3) structure of negative-parity baryon states

After a brief historical background on the Λ s (1405), we revisit the 25 year old controversy on whether Λ s (1405) is a qqq (L=1) three quark state or aKN quasi virtual bound state. This work is stimulated by the recent suggestion of Isgur that s be treated as a heavy quark in heavy quark effective theory HQET. We re-examine the empirical evidence for minimal mixing amongst singlets and octets in negative parity baryon states, with a possible dynamical origin in the opening of inelastic threshold channels. Finally, we suggest that Λ s (1405) belongs to a class of hadrons which are described simultaneously as qqq or qq states and as hadronic bound states. *

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Some Comments on Baryonic States

Feynman

Pakvasa

Tuan

1970

Phys. Rev. D

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We discuss some regularities in the baryon mass spectrum which have been suggested by one of us and possible experimental verification of them.I N this paper we should like to call attention to certain approximate regularities among the square masses of the baryons with the hope that future research can establish whether they are real or are the result of numerical accidents in the limited data available.Our classification of states will be guided by the three-quark model of "baryons" and the principle of Regge recurrence. The states1 of three quarks each of spin 3 depend on the symmetry character of the state.If it is symmetric, i t is a 56 (consisting of a spinquartet unitary-spin decimet, '10, and a spin-doublet unitary-spin octet, 28). If it is antisymmetric it is a 20 (spin-doublet unitary-spin octet, 28, and a spinquartet singlet, 41). For the intermediate symmetry, we have the double representation of a 70=21, 28, 48, 210.Ib-e nest suppose that the over-all state is entirely symmetric. If we add internal degrees of freedom, we suppose that the lowest states are the s states, themselves symmetric and of zero angdlar momentum. Thus our lowest states are where the ablP give spin multiplicity a, unitary spin multiplicity b, parity $, and angular momentum j of the states. These, of course, are talien to be the fundamental octet and the lowest decimet (with A=1236).

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The SU(3) structure of negative-parity baryon states

Cited by 5 publications

References 42 publications

Formation and decay of negative-parity baryon resonances in a brokenU 6,6 model

Formation and decay of negative-parity baryon resonances in a brokenU 6,6 model

Λs(1405) and negative parity baryon states

Some Comments on Baryonic States

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