EOS of Hadron Matter with Inclusions of Pentaquark θ＋1

• 作者: Li Xiguo Gao Yuan Li Yongqing
• 来源期刊: 近代物理研究所和兰州重离子加速器实验室年报：英文版
• 学科: 物理学
• 关键词: 五夸克态 状态方程 强子物质 夹杂物 手征孤立子模型 实验发现 同位旋 Π介子
• 年，卷（期）: 2004,（1）
• 页码范围: 17
• 页数: 1页
• 分类号: O572.243

摘要

<正>In 1997, Diakonov, Petrov, and Polyakov, in the framework of the chiral soliton model, predicted an exotic baryon (?)+ with mass M ≈1.53 GeV, S = +1, spin 1/2 and isospin 0. However, the subject has been thrust to the fore- front during the past two years by the experimental discovery of an exotic baryon. The self energy of the (?)+ pentaquark shows that the in-medium renormalization of the pion in the two meson cloud of the (?)+ leads to a sizable attraction, which is enough to produce a large number of bound and narrow (?)+ states in nuclei. We extend the density dependent relativistic hadron field theory(DDRH) to study the EOS of hadron matter with inclusions of pentaquark (?)+. In mean field approximation, the energy density is