弦模型中两个接受窗内多重性之间的强密集可观测性
Strongly intensive observable between multiplicities in two acceptance windows in a string model
摘要：
以夸克胶子弦为源，计算了在快度和方位角上分开的两个接受窗口中多重数之间的强可观测量。分析了该观测量与弦的两粒子关联函数、观测窗宽度以及观测窗之间的快度间隙的关系。在独立的相同字符串的情况下，模型计算证实了这个观察到的强烈的密集字符：它是独立的字符串的平均数和它的波动。对于这种情况下，它的行为的特殊性，不同的粒子与电荷进行了分析。在考虑弦融合过程的情况下，在碰撞中发生了几种不同类型的弦的形成，证明了这个观测值等于不同弦类型的值的加权平均值。不幸的是，在这种情况下，通过权重因子，这个可观察到的变得依赖于碰撞条件，并且严格地说，不能再被认为是强密集变量。为了进行比较，还介绍了与PYTHIA事件发生器的计算结果。
英文摘要：
The strongly intensive observable between multiplicities in two acceptance windows separated in rapidity and azimuth is calculated in the model with quark-gluon strings acting as sources. The dependence of this observable on the two-particle correlation function of a string, the width of observation windows and the rapidity gap between them is analyzed. In the case with independent identical strings the model calculation confirms the strongly intensive character of this observable: it is independent of both the mean number of string and its fluctuation. For this case the peculiarities of its behaviour for particles with different electric charges are also analyzed. In the case when the string fusion processes are taken into account and a formation of strings of a few different types takes place in a collision, this observable is proved to be equal to a weighted average of its values for different string types. Unfortunately, in this case through the weight factors this observable becomes dependent on collision conditions and, strictly speaking, can not be considered any more as strongly intensive variable. For a comparison the results of the calculation of considered observable with the PYTHIA event generator are also presented.
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