A theory of scalar mesons

被引：207

作者：

't Hooft, G. ^{[5
,6
]}

Isidori, G. ^{[3
,4
]}

Maiani, L. ^{[1
,2
]}

Polosa, A. D. ^{[1
]}

Riquer, V. ^{[1
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Roma La Sapienza, I-00185 Rome, Italy

[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[3] Ist Nazl Fis Nucl, Nazl Frascati Lab, I-00044 Frascati, Italy

[4] Scuola Normale Super Pisa, I-56126 Pisa, Italy

[5] Univ Utrecht, Inst Theoret Phys, NL-3508 TA Utrecht, Netherlands

[6] Spinoza Inst, NL-3508 TA Utrecht, Netherlands

来源：

PHYSICS LETTERS B | 2008年 / 662卷 / 05期

关键词：

D O I：

10.1016/j.physletb.2008.03.036

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss the effect of the instanton induced, six-fermion effective Lagrangian on the decays of the lightest scalar mesons in the diquark-antidiquark picture. This addition allows for a remarkably good description of light scalar meson decays. The same effective Lagrangian produces a mixing of the lightest scalars with the positive parity q (q) over bar states. Comparing with previous work where the q (q) over bar mesons are identified with the nonet at 1200-1700 MeV, we find that the mixing required to fit the mass spectrum is in good agreement with the instanton coupling obtained from light scalar decays. A coherent picture of scalar mesons as a mixture of tetraquark states (dominating in the lightest mesons) and heavy q (q) over bar states (dominating in the heavier mesons) emerges. (C) 2008 Published by Elsevier B.V.

引用

页码：424 / 430

页数：7

共 48 条

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