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arXiv 1005.2909hep-phhep-ex
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强子对撞机上Gaugino对产生的阈值再确认

Threshold resummation for gaugino pair production at hadron colliders

J. Debove, B. Fuks, M. Klasen

摘要:

我们提出了一个完整的分析阈值重直接轻和重的Gaugino对生产的Tevatron和LHC的影响。基于一种新的次领先阶微扰计算方法,考虑了squark混合效应,在有限系数函数中保留了SUSY-QCD修正的同时,在领先和次领先的对数精度下恢复了阈值区的软胶子辐射.这使我们能够正确地匹配的图形的微扰截面。泛子导图以全矩阵形式表示。我们发现,阈值remation略有增加,相当稳定不变的质谱和总截面相对于下一个领先的顺序计算。为了供将来参考,我们以表格形式列出了几个常用的SUSY基准点、高根诺对和强子对撞机能量的总截面及其理论误差。

英文摘要:

We present a complete analysis of threshold resummation effects on direct light and heavy gaugino pair production at the Tevatron and the LHC. Based on a new perturbative calculation at next-to-leading order of SUSY-QCD, which includes also squark mixing effects, we resum soft gluon radiation in the threshold region at leading and next-to-leading logarithmic accuracy, retaining at the same time the full SUSY-QCD corrections in the finite coefficient function. This allows us to correctly match the resummed to the perturbative cross section. Universal subleading logarithms are resummed in full matrix form. We find that threshold resummation slightly increases and considerably stabilizes the invariant mass spectra and total cross sections with respect to the next-to-leading order calculation. For future reference, we present total cross sections and their theoretical errors in tabular form for several commonly used SUSY benchmark points, gaugino pairs, and hadron collider energies.

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