两种色联接下的重子介子比及重子反重子关联  

Ratio of Baryon to Meson and Baryon Antibaryon Correlation in e^+e^- Annihilation under Two Kinds of Color Connections

作　　者：邵凤兰[1] 谢去病[1] 

机构地区：[1]山东大学物理与微电子学院,济南250100

出　　处：《高能物理与核物理》2002年第8期779-785,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (1 0 0 75 0 3 1 )~~

摘　　要：在e+e- →h′s反应中 ,末态重子介子比及重子反重子关联 ,在流行的强子化模型中 ,仅有JETSET事件发生器能通过调节专用附加参数较好拟合实验 ,被认为是检验强子化模型的最敏感可观察量 .用微扰QCD所允许的末态部分子1 0 0 %的色分离联接 ,取代JETSET中大Nc 近似下的色中性流联接 ,对这些可观察量作了预言 .并与JETSET原有预言及最新实验结果作了比较 .发现色分离联接同样甚至更好地与这些实验符合 ,这表明原来用色中性流联接与这些实验事实基本符合 ,并不意味着色中性流就是非微扰QCD选择的色联接方式 ,1 0 0 %的色分离联接也是可能的 .The ratio of final baryon to meson and baryon antibaryon correlation in e +e - annihilation are considered as sensitive observables to test the hadronizition models,because among the results obtainted in different popular hadronizition models,only those from JETSET event generator can fit experimental data by adjusting extra ad hoc parameters. We replace the color neutral flow connection,which is the results in large N c limit and is used in JETSET,with the color separate connection,which is allowed by PQCD,and calculate these observables. We compare the obtained results with those from the standard JETSET7.4 code and the available experimental data. We find that the results and the relevant properties are consistent with data. This shows that the consistency of the data with the results from the standard JETSET7.4 code for these properties does not mean that the traditional color neutral flow is the only color connection selected by NPQCD. The 100% color separate connection is also possible.

关 键 词：色联接 色分离联接 重子介子比 重子反重子关联 强子化模型 强相互作用 

分 类 号：O572.24[理学—粒子物理与原子核物理]