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arXiv 0704.0597hep-ex
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用LEP-2的DELPHI探测器研究WW事例的色重联

Investigation of Colour Reconnection in WW Events with the DELPHI detector at LEP-2

The DELPHI Collaboration, J. Abdallah

摘要:

在反应e+e-> WW ->(q_1 qbar_2)(q_3 qbar_4)中,通常的强子化模型分别处理来自两个W玻色子的色单态q_1 qbar_2和q_3 qbar_4。然而,由于末态部分子可能在时空中共存,两个演化的强子系统之间的串扰可能在碎裂过程中通过软胶子交换。这种效应被称为颜色重连。本文介绍了在LEP上用DELPHI研究W对全强子衰变中色重联效应的结果。进行了两个互补的分析,研究射流和W质量估计之间的粒子流,它们之间的相关性可以忽略不计,并将结果结合起来,并与模型进行比较。在SK-1模型的框架中,发现其与数据最相容的kappa参数的值为:kappa_{SK-I} = 2.2^{+2.5}_{-1.3},对应于在68%置信水平下重连的概率P_{reco}在0.31 < P_{reco} < 0.68的范围内,其最佳值为0.52。

英文摘要:

In the reaction e+e- -> WW -> (q_1 qbar_2)(q_3 qbar_4) the usual hadronization models treat the colour singlets q_1 qbar_2 and q_3 qbar_4 coming from two W bosons independently. However, since the final state partons may coexist in space and time, cross-talk between the two evolving hadronic systems may be possible during fragmentation through soft gluon exchange. This effect is known as Colour Reconnection. In this article the results of the investigation of Colour Reconnection effects in fully hadronic decays of W pairs in DELPHI at LEP are presented. Two complementary analyses were performed, studying the particle flow between jets and W mass estimators, with negligible correlation between them, and the results were combined and compared to models. In the framework of the SK-I model, the value for its kappa parameter most compatible with the data was found to be: kappa_{SK-I} = 2.2^{+2.5}_{-1.3} corresponding to the probability of reconnection P_{reco} to be in the range 0.31 < P_{reco} < 0.68 at 68% confidence level with its best value at 0.52.

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。

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