用轨道函数计算轨道推力
Calculating Track Thrust with Track Functions
摘要：
在LEP的e+e-事件形状研究中，有时会进行两种不同的测量：使用带电粒子和中性粒子的“量热”测量，以及仅使用带电粒子的“基于径迹”测量。量热测量是红外线和共线安全的，因此可以在微扰QCD中计算，而基于轨道的测量必须依赖于非微扰强子化效应。另一方面，基于轨迹的测量通常具有较小的实验不确定性。在本文中，我们提出了第一次计算的事件形状轨道推力和比较在ALEPH和DELPHI进行的测量。这种计算是通过最近发展的轨道函数的形式主义，这是非微扰对象描述如何充满活力的部分子碎片成带电强子。通过将轨道函数引入软共线有效理论，计算了次超前对数迭代轨道推力分布。由于非微扰参数之间的部分抵消，量热计推力和轨道推力的分布非常相似，LEP数据中也可以看到这一特征。
英文摘要：
In e+e- event shapes studies at LEP, two different measurements were sometimes performed: a "calorimetric" measurement using both charged and neutral particles, and a "track-based" measurement using just charged particles. Whereas calorimetric measurements are infrared and collinear safe and therefore calculable in perturbative QCD, track-based measurements necessarily depend on non-perturbative hadronization effects. On the other hand, track-based measurements typically have smaller experimental uncertainties. In this paper, we present the first calculation of the event shape track thrust and compare to measurements performed at ALEPH and DELPHI. This calculation is made possible through the recently developed formalism of track functions, which are non-perturbative objects describing how energetic partons fragment into charged hadrons. By incorporating track functions into soft-collinear effective theory, we calculate the distribution for track thrust with next-to-leading logarithmic resummation. Due to a partial cancellation between non-perturbative parameters, the distributions for calorimeter thrust and track thrust are remarkably similar, a feature also seen in LEP data.
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