New relations for excited baryons in large-Nc QCD -: art. no. 012001

被引：217

作者：

Cohen, TD ^{[1
]}

Lebed, RF

机构：

[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[2] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.91.012001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that excited baryons in large-N-c QCD form multiplets, within which masses are first split at O(1/N-c). The dominant couplings of resonances to various mesons are highly constrained: The N(1535) decays at leading 1/N-c order exclusively to eta-N rather than pi-N, and vice versa for the N(1650). This multiplet structure is reproduced by a simple large-N-c quark model, well studied in the literature, that describes resonances as single-quark excitations.

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