Spectroscopy of pentaquark states

被引：89

作者：

Bijker, R

Giannini, MM

Santopinto, E

机构：

[1] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico

[2] Ist Nazl Fis Nucl, Sez Genova, Dipartimento Fis, I-16164 Genoa, Italy

来源：

EUROPEAN PHYSICAL JOURNAL A | 2004年 / 22卷 / 02期

关键词：

D O I：

10.1140/epja/i2003-10232-x

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We construct a complete classification of qqqq (q) over bar pentaquark states in terms of' the spin-flavour SU(6) representations. We find that only sonic definite SU(3) representations are allowed. that is singlets, octects. decuplets. ariti-decuplets, 27-plets and 35-plets. The latter three contain exotic states, which cannot be constructed from three quarks only. This complete classification is general and model independent and is useful both for model builders and experimentalists. The mass spectrum is obtained from a Gursey-Radicati type mass formula. whose coefficients have been determined previously by a study of qqq-baryons. The ground-state pentaquark, which is identified with the recently observed Theta(+)(1540) state, is predicted to be an isosinglet anti-decuplet state. Its parity depends on the interplay between the spin-flavour and orbital contributions to the mass operator.

引用

页码：319 / 329

页数：11

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