Energy and virtuality scale dependence in quark and gluon jets
Energy and virtuality scale dependence in quark and gluon jets
复制标题
夸克和胶子射流中的能量和虚拟尺度依赖性
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Sweden.
中科院分区：
文献类型：
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作者：
P. Edén;Gosta Gustafson Dept. of Ther. Phys.;L. University;Sweden.
我们讨论了e+e湮灭中夸克和胶子喷注中的一些重要问题。在QCD中，喷流的性质一般取决于两个尺度，即喷流的能量和虚度。通常，理论预测适用于这些尺度重合的情况，而对于实验数据，它们往往是不同的。因此，要分析得出夸克和胶子喷注之间的渐近多重数比Cf/CA，需要一个仔细指定的喷注定义，以及对多重数演化的非主导修正的计算。我们提出了系统地研究实验数据中两种尺度的分离依赖关系的方法，并将结果与理论进行了比较。我们给出了与理论上所考虑的喷流相对应的喷流发现算法。我们还表明，反冲效应增加了修正的前导对数近似，这在数量上是重要的，尽管在高能下形式上是被抑制的。(更少)
We discuss some important issues concerning multiplicities in quark and gluon jets in e+e- annihilation. In QCD the properties of a jet in general depend on two scales, the energy and virtuality of the jet. Frequently theoretical predictions apply to a situation where these scales coincide, while for experimental data they are often different. Thus an analysis to extract e.g. the asymptotic multiplicity ratio CF/CA between quark and gluon jets, needs a carefully specified jet definition, together with a calculation of nonleading corrections to the multiplicity evolution. We propose methods to systematically study the separate dependence upon the two scales in experimental data and compare the results with theory. We present jet finding algorithms which corresponds well to the theoretically considered jets. We also show that recoil effects add corrections to the modified leading log approximation which are quantitatively important, though formally suppressed at high energies. (Less)