References of "Matagne, Nicolas"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailUpdated $1/N_c$ expansion analysis of $[56,2^+]$ and $[70,\ell^+]$ baryon multiplets
Matagne, Nicolas ULiege; Stancu, Floarea ULiege

in Physical Review. D, Particles and Fields (2016), 93

The mass spectra of the $[{\bf 56, 2^+}]$ and $[{\bf 70, \ell+}]$ multiplets, both belonging to the $N$ = 2 band, is reviewed in the $1/N_c$ expansion method. Previous studies, separately made for each ... [more ▼]

The mass spectra of the $[{\bf 56, 2^+}]$ and $[{\bf 70, \ell+}]$ multiplets, both belonging to the $N$ = 2 band, is reviewed in the $1/N_c$ expansion method. Previous studies, separately made for each multiplet, are presently updated to the 2014 Particle Data Group. The mass formula including corrections up to $\mathcal{O}(1/N_c)$ and first order in SU(3) flavor symmetry breaking, has the same independent operator basis in both cases. A special emphasis is made on the role of the SU(3) symmetry breaking operators $B_i$ $(i = 1,2,3)$. This can allow for multiplet assignment of $\Lambda$ and $\Sigma$ hyperons, which generally is quite difficult to make. Tentative assignments of hyperons with two- and one-star resonances are made to the $[{\bf 70, \ell+}]$ multiplet. Another important aim is to find out whether or not a common value of the coefficient $c_1$ of the dominant operator in the mass formula, can well fit the present data in both multiplets. A negative answer, which is here the case, implies distinct Regge trajectories for symmetric and mixed symmetric states. [less ▲]

Detailed reference viewed: 12 (1 ULiège)
Full Text
Peer Reviewed
See detailHighly excited negative parity baryons in the 1/Nc expansion.
Matagne, Nicolas ULiege; Stancu, Floarea ULiege

in Physical Review. D, Particles and Fields (2012), D85

Detailed reference viewed: 11 (8 ULiège)
Full Text
See detailNegative parity nonstrange baryons in large Nc QCD: quark excitation versus meson-nucleon scattering
Stancu, Floarea ULiege; Matagne, Nicolas ULiege

in Bled Workshops in Physics (2011), 12(1), 57-63

We show that the two complementary pictures of large $N_c$ baryons - the single-quark orbital excitation about a symmetric core and the meson-nucleon resonance -- are compatible for $\ell$ = 3 SU(4 ... [more ▼]

We show that the two complementary pictures of large $N_c$ baryons - the single-quark orbital excitation about a symmetric core and the meson-nucleon resonance -- are compatible for $\ell$ = 3 SU(4) baryons. The proof is based on a simple Hamiltonian including operators up to order $\mathcal{O}(N^0_c)$ used previously in the literature for $\ell$ = 1. [less ▲]

Detailed reference viewed: 6 (2 ULiège)
Full Text
Peer Reviewed
See detailNew look at the [70,1-] nonstrange and strange baryons in the 1/Nc expansion
Matagne, Nicolas ULiege; Stancu, Floarea ULiege

in AIP Conference Proceedings (2011), 1343

The masses of excited nonstrange and strange baryons belonging to the multiplet $[{\bf 70},1^-]$ are calculated in the $1/N_c$ expansion to order $1/N_c$ with a new method which allows to considerably ... [more ▼]

The masses of excited nonstrange and strange baryons belonging to the multiplet $[{\bf 70},1^-]$ are calculated in the $1/N_c$ expansion to order $1/N_c$ with a new method which allows to considerably reduce the number of linearly independent operators entering the mass formula. This study represents an extension to SU(6) of our work on nonstrange baryons, the framework of which was SU(4). [less ▲]

Detailed reference viewed: 24 (12 ULiège)