Tetraquarks with exotic flavor quantum numbers at large Nc in QCD(AS)

被引：26
作者：
Cohen, Thomas D. [1 ]
Lebed, Richard F. [2 ]
机构：
[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[2] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
来源：
PHYSICAL REVIEW D | 2014年 / 89卷 / 05期
基金：
美国国家科学基金会;
关键词：
MESONS;
D O I：
10.1103/PhysRevD.89.054018
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
It is shown that the large N-c limit of QCD with quarks in the two-index antisymmetric color representation [QCD(AS)] has narrow tetraquark states with exotic flavor quantum numbers. They decay into mesons with a width that is parametrically O(1/N-c(2)). Tetraquarks with nonexotic quantum numbers mix at leading order with mesons of the same overall quantum numbers. QCD(AS) at N-c = 3 corresponds to ordinary QCD; its large N-c limit represents an alternative starting point for a 1/N-c expansion to the standard one with quarks in the fundamental color representation.
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