Reference : Excited baryons in the 1/Nc expansion.
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Physics
Excited baryons in the 1/Nc expansion.
Matagne, Nicolas mailto [University of Mons > > Physique Nucléaire et Subnucléaire > >]
Stancu, Floarea mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > IFPA > >]
AIP Conference Proceedings
American Institute of Physics
Yes (verified by ORBi)
New York
8th International Workshop on the Physics of Excited Nucleons: NSTAR 2011
17-20 May 2011
Thomas Jefferson Laboratory
Newport News, Virginia
[en] We briefly describe the 1/Nc expansion method for studying baryon masses. Two approaches of the large Nc excited baryons have been proposed so far. The first one, based on the Hartree picture, treats the baryon as a ground state core and an excited quark and the second one, suggested recently, considers the baryon globally, without decoupling the system. The masses of excited states of mixed orbital symmetry of nonstrange and strange baryons belonging to the lowest [70, −] multiplet are calculated in the 1/Nc expansion to order 1/Nc with the new method which allows to considerably reduce the number of linearly independent operators entering the mass formula. The status of the resonance Λ(1405) is discussed.

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