论文标题
$ e^+e^ - $ collisions的两粒子方位角相关性在91---209 GEV，lep-2的存档aleph数据
Two-particle azimuthal correlations in $e^+e^-$ collisions at 91--209 GeV with archived ALEPH data at LEP-2
论文作者
论文摘要
我们介绍了以$ e^+e^ - $ nihihitation产生的带电粒子的两粒子角相关性的第一个测量，最高为$ \ sqrt {s} = $ 209 GEV。该分析利用了在1992年至2000年之间在LEP上与Aleph检测器收集的91至209 GEV之间的存档的HADRONIC $ e^+E^ - $数据。在较大的假速率上测量了角度的相关函数，该函数在广泛的伪造范围内，并且全含Azimuth和全适合使用LEP-2数据的电荷粒子函数。在91 GEV时，在光束坐标分析或推力坐标分析中未观察到显着的远距离相关性，其中后者对从Z Boson衰减的介绍$ q \ bar {q} $对之间的介质横向向横向伸展敏感。首次提出了$ e^+e^ - $ $数据的碰撞能量比91 GEV更高的碰撞能量（提供更高的事件多重性达到50左右）的结果首次提出。推力轴分析显示了两粒子相关函数的近距离近距离过度。我们进行了两粒子相关函数的傅立叶串联分解。在具有50多个粒子的高多种事件中，提取的傅立叶系数$ v_2 $和$ v_3 $的数据大小比MC参考大。
We present the first measurement of two-particle angular correlations of charged particles produced in $e^+e^-$ annihilation up to $\sqrt{s}=$ 209 GeV. This analysis utilized the archived hadronic $e^+e^-$ data at center-of-mass energy between 91 and 209 GeV collected with the ALEPH detector at LEP between 1992 and 2000. The angular correlation functions are measured over a broad range of pseudorapidity and full azimuth as a function of charged particle multiplicity for the first time with LEP-2 data. At 91 GeV, no significant long-range correlation is observed in either the beam 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 the Z boson decays. Results with $e^+e^-$ data at higher collision energy than 91 GeV, providing higher event multiplicity reach up to around 50, are presented for the first time. The thrust axis analysis shows a long-range near-side excess in the two-particle correlation function. We performed Fourier series decomposition of the two-particle correlation functions. In high multiplicity events with more than 50 particles, the extracted Fourier coefficients $v_2$ and $v_3$ magnitudes in data are larger than the MC reference.
