Baryon resonances in large Nc QCD

[en] We review the current status and present open challenges of large $N_c$ QCD baryon spectroscopy. After introducing the $1/N_c$ expansion method we first shortly revisit the latest achievements for the ground state properties. Next we discuss the applicability of this method to excited states, presenting two different approaches with their advantages and disadvantages. Selected results for the spectrum and strong and electromagnetic decays are described. We also present further developments for the applicability of the method to excited states, based on the qualitative compatibility between the quark excitation picture and the meson-nucleon scattering picture. We show that a quantitative comparison between results obtained from the mass formula of the $1/N_c$ expansion method and quark models brings convincing support to quark models and shortly discuss the implications of different large $N_c$ limits. We stress that the SU(6) spin-flavor structure of large $N_c$ baryon allows a convenient classification of highly excited resonances into SU(3) multiplets and predicts mass ranges for the missing partners.

Disciplines :

Physics

Author, co-author :

Matagne, Nicolas; Université de Mons-Hainaut - UMH > Physique > Service de Physique Nucléaire et Subnucléaire

Stancu, Floarea ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)

Language :

English

Title :

Baryon resonances in large Nc QCD

Publication date :

10 March 2015

Journal title :

Reviews of Modern Physics

ISSN :

0034-6861

eISSN :

1539-0756

Publisher :

American Physical Society, United States

Volume :

Pages :

211-245

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://arXiv:1406.1791

Available on ORBi :

since 08 January 2015

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