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通过运用蒙特卡罗方法,研究了熵指数对多重数分布的宽度和形状的依赖性,并和NA2?2实验结果作比较.发现,熵指数对多重数分布的形状变化不敏感,但是却随着分布宽度的增加而减小.这一发现和通常基于熵指数的物理意义的期待是矛盾的 相似文献
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讨论高能多粒子产生反常标度性研究中的各种相空间变量选择.为了克服几种常用的横向相空间变量的缺点,引入了一组新的横向变量.这组变量在讨论高能多粒子产生中的反常标度性时有优越性.给出了这组新变量的统计分布及数值特征,讨论了它们之间的独立性,给出了相应的累积变量. 相似文献
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利用AMPT蒙特卡罗产生器中的强子化程序模块ART1.0, 得到了强子化过程的演化图形, 并基于强子在不同时刻的空间分布图, 估算出了不同时刻的反应区域半径. 将所得结果与根据HBT关联得到的结果相比较, 定出了冻结为强子气体的时刻, 得到了合理的结果. 相似文献
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A study of the dynamical-fluctuation property of 2-jet events is carried out. It is found that the dynamical fluctuations of the hadronic system inside 2-jet events change with the variation of the cut parameter ycut. There is a transition point, where the dynamical fluctuations in these systems are circular in the transverse plane; and are elliptical in the longitudinal-transverse planes. It is shown that this transition point corresponds to the scale of visible jets. Meanwhile, the dynamical fluctuation properties inside a single-jet in 2-jet and 3-jet events are compared. The dynamical fluctuations inside quark- and gluon-jets are found to be qualitatively different. A scale for the "visible gluon jet" production is thus obtained. 相似文献
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有限温度下无质量ψ^3理论中角度红外发散的正规化 总被引:2,自引:2,他引:0
讨论了无质量标量场ψ^3理论三圈真空图中的角度红外发散以及它的维数正规化方案,并给出了它在D维空间的解析表达式。 相似文献
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利用三火球模型,对强子-强子碰撞中平均横动量和多重数的关系进行了计算,根据两个侧边火球贡献的变化,成功地解释了在ISR顶峰能量以下平均横动量与多重数关系曲线的斜率为负、并随能量的升高而增加、以及多重数低时平均横动量近似地与能量无关的现象. 相似文献
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Source Function Determined from Hanbury—Brown/Twiss Correlations by the Maximum Entropy Principle
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We study the reconstruction of the source function in space-time directly from the measured Hanbury-Brown/Twiss (HBT) correlation function using the maximum entropy principle.We find that the problem is ill-defined without at least one additional theoretical constraint as input.Using the requirement of a finite source lifetime for the problem we find a new Gaussian parametrization of the source function directly in terms of the measured HBT radius parameters and its lifetime,where the latter is a free parameter which is not directly measurable by HBT.We discuss the implication of our results for the remaining freed om in building source models consistent with a given set of measured HBT radius parameters. 相似文献