Exotic quark structure of Λ(1405) and scalar nonet in QCD sum rule

被引：0

作者：

Nakamura, T. ^{[1
]}

Sugiyama, J. ^{[1
]}

Ishii, N. ^{[2
]}

Nishikawa, T. ^{[1
]}

Oka, M. ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan

[2] Univ Tsukuba, Ctr Computat Sci, Tsukuba 3058571, Japan

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2007年 / 40卷 / 02期

关键词：

exotic hadron; QCD sum rule;

D O I：

10.1016/j.physe.2007.06.043

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mixing of multi-quark components in the non-singlet scalar mesons and the flavor singlet A(1405) baryon with negative parity are studied in the QCD sum rule. We propose a formulation to evaluate cross-correlators of q (q) over bar (qqq) and qq (q) over bar(q) over bar (qqqq (q) over bar) operators and to define mixing of different Fock states in the sum rule. It is applied to the non-singlet scalar mesons and Lambda(1405) baryon. We find that the multi-quark operators predict lower masses than the q (q) over bar (qqq) operators and that the multi-quark states are dominant in the lowest mass states. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：410 / 413

页数：4

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