Pentaquark■^+对核物质状态方程的影响

Effect of Pentaquark ■^+ on the Equation of State of Nuclear Matter

假定■^+通过交换有效的同位旋标量介子σ和ω与核子和它本身发生相互作用,在密度相关的相对论平均场理论基础上研究了{p,n,■^+}系统状态方程和可能形成的亚稳定态．讨论了在不同的重子密度下质子中子同位旋比值以及Pentaquark ■^+成分对系统单个重子能的影响．计算结果表明,在单个重子能取极小时,■^+有可能在核物质中束缚存在．

Assuming Θ^＋ interacts with nucleon or Θ^＋ by exchanging isoscalar mesons σ and ω, the equation of state of {p,n,Θ^＋} and possible metastable state are studied in the framwork of the density dependent relativistic hadron field theory（DDRH）. The ratio of the proton isospin to the neutron isospin with different baryon densities and the effect of the Θ^＋ component on the binding energy per baryon of the system are also discussed. It is shown that when the binding energy per baryon of the system takes the maximal value, Θ^＋ might be bound in the nuclear matter.