arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.3186hep-ph
收藏

再论$e^+e^-$碰撞中的辐射斑图

Revisiting Radiation Patterns in $e^+e^-$ Collisions

Nadine Fischer, Stefan Gieseke, Simon Plätzer, Peter Skands

摘要:

我们提出了四个简单的事件形状变量的半包容性$e^+e^- \to 4$喷流事件。观测量和削减的设计是特别敏感的事件结构的次主导方面,并允许测试的可靠性的唯象QCD模型更详细。其中三个,$θ_{14}$,$θ^*$,和$C_2^{(1/5)}$,专注于软排放关闭三喷流拓扑结构与一个小的开口角,为领先的QCD偶极模式以外的相干效应预计将得到增强。一个补充变量,$M_L^2/M_H^2$,测量半球质量的比例,在4喷流事件与压缩的规模层次(达勒姆$y_{23}\sim y_{34}$),其中子领导$1\to 3$分裂效应预计将得到增强。我们考虑了几种不同的部分子簇射模型,跨越传统和偶极子/天线的,所有调谐到相同的$e^+e^-$参考数据,并表明,建议的可观测量将允许额外的显着的模型之间的鉴别能力。

英文摘要:

We propose four simple event-shape variables for semi-inclusive $e^+e^- \to 4$-jet events. The observables and cuts are designed to be especially sensitive to subleading aspects of the event structure, and allow to test the reliability of phenomenological QCD models in greater detail. Three of them, $θ_{14}$, $θ^*$, and $C_2^{(1/5)}$, focus on soft emissions off three-jet topologies with a small opening angle, for which coherence effects beyond the leading QCD dipole pattern are expected to be enhanced. A complementary variable, $M_L^2/M_H^2$, measures the ratio of the hemisphere masses in 4-jet events with a compressed scale hierarchy (Durham $y_{23}\sim y_{34}$), for which subleading $1\to 3$ splitting effects are expected to be enhanced. We consider several different parton-shower models, spanning both conventional and dipole/antenna ones, all tuned to the same $e^+e^-$ reference data, and show that a measurement of the proposed observables would allow for additional significant discriminating power between the models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑