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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 下载免费PDF全文
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
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In order to trace azimuthal angle dependence of the initial interaction in ultra-relativistic heavy ion collision, two azimuthal multiplicity-correlation patterns neighboring and fixed-to-arbitrary angularbin correlation patterns -- are suggested. From the simulation of Au + Au collisions at √SNN = 200 GeV by using the Monte Carlo models RQMD with hadron re-scattering and AMPT with and without string melting, we observe that the correlation patterns change gradually from out-of-plane preferential one to inplane preferential one when the centrality of collision shifts from the central collision to peripheral collision, meanwhile the anisotropic collective flow v2 keeps positive in all cases. This regularity is found to be collision energy independent. The physics behind the two opposite trends of correlation patterns, in particular, the presence of out-of-plane correlation patterns at RHIC energy, are discussed. 相似文献
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在领头级近似下计算了HERA硬光生过程中直接光子和分解光子与质子作用的单、双光子产生截面.结果表明:当xT≤0.15时,对单光子产生的主要贡献来自于分解光子过程;当xT≥0.15时,主要贡献来自于直接光子过程.双光子的主要产生源则是分解光子的两个子过程:qq→γγ和gg→γγ,且双光子的产生截面与同等条件下,h1h2→γγX的截面在同一量级.研究双光子产生有助于探明分解光子的结构. 相似文献
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本文建议用相邻现代分割的条件熵和信息量来分析多重产生中的随机级联机制.证明了当所研究事件的多重数足够高时,这些特征量对分析自相似级联机制的存在及其性质很有效. 相似文献