arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.00489hep-ex
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用ALEPH存档数据测量91 GeV的$e^+e^-$碰撞中的两粒子关联

Measurements of two-particle correlations in $e^+e^-$ collisions at 91 GeV with ALEPH archived data

Anthony Badea, Austin Baty, Paoti Chang, Gian Michele Innocenti, Marcello Maggi, Christopher McGinn, Michael Peters, Tzu-An Sheng, Jesse Thaler, Yen-Jie Lee

摘要:

测量了强子$Z$衰变中发射的带电粒子的两粒子角关联。存档的$e^+e^-$湮灭数据在一个中心的质量能量为91 GeV的ALEPH探测器收集在LEP在1992年和1995年之间。关联函数的测量范围广泛的赝快度和全方位作为带电粒子多重性的函数。在实验室坐标分析或推力坐标分析中均未观察到显著的长程相关性,其中后者对横向于来自$Z$玻色子衰变的传出$q\bar{q}$对之间的色弦的介质扩展敏感。与HERWIG v7.1.5相比,两种分析中的相关产量分布与PYTHIA v6.1事件发生器的预测更一致。它们为簇射和强子化建模提供了新的见解。这些结果对质子-质子、质子-核和核-核碰撞中所观察到的长程关联提供了重要的参考。

英文摘要:

Measurements of two-particle angular correlations of charged particles emitted in hadronic $Z$ decays are presented. The archived $e^+e^-$ annihilation data at a center-of-mass energy of 91 GeV were collected with the ALEPH detector at LEP between 1992 and 1995. The correlation functions are measured over a broad range of pseudorapidity and full azimuth as a function of charged particle multiplicity. No significant long-range correlation is observed in either the lab coordinate analysis or the thrust coordinate analysis, where the latter is sensitive to a medium expanding transverse to the color string between the outgoing $q\bar{q}$ pair from $Z$ boson decays. The associated yield distributions in both analyses are in better agreement with the prediction from the PYTHIA v6.1 event generator than from HERWIG v7.1.5. They provide new insights to showering and hadronization modeling. These results serve as an important reference to the observed long-range correlation in proton-proton, proton-nucleus, and nucleus-nucleus collisions.

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