标题： 介子-核子耦合的强度依赖性在多介子产生过程中的必要性 显示英文标题

标题： Need for the intensity-dependent pion-nucleon coupling in multipion production processes

摘要： 我们给出支持在热密度矩阵方法中使用有效强度依赖的介子-核子耦合哈密顿量来描述介子多重性分布和相应因子矩的性质的理由。我们解释了介子的负二项（NB）分布以及Wroblewski的著名经验关系的出现。我们的模型哈密顿量是SU(1,1)群生成元的线性组合。我们找到了有限温度T下的介子多重性分布的生成函数，并讨论了二阶因子矩的性质。此外，我们表明强度依赖的介子-核子耦合会产生介子场的压缩态。在T=0时，这些压缩态成为NB分布的固有属性。 显示英文摘要

摘要： We give reasons in support of the use of an effective intensity-dependent pion-nucleon coupling Hamiltonian for describing the properties of the pion multiplicity distribution and the corresponding factorial moments within the thermal-density matrix approach.We explain the appearance of the negative-binomial (NB) distribution for pions and the well-known empi- rical relation of Wroblewski.Our model Hamiltonian is written as a linear combination of the generators of the SU(1,1) group.We find the generating function for the pion multiplicity distribution at finite temperature T and discuss the properties of the second-order factorial moment.Also, we show that an intensity-dependent pion-nucleon coupling generates the squeezed states of the pion field. At T=0, these squeezed states become an inherent property of the NB distribution.