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arXiv 1001.4082hep-ph
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强子对撞机事件形状的唯象学

Phenomenology of event shapes at hadron colliders

Andrea Banfi, Gavin P. Salam, Giulia Zanderighi

摘要:

本文给出了强子对撞机上一系列双喷流事件形状的匹配分布的计算结果,其中结合了再膨胀指数的次首对数(NLL)精度、其展开的次首对数(NNLL)精度和纯α_s展开的次首阶(NLO)精度。这是首次在强子对撞机上对强子末态观测量进行这样的匹配。我们比较我们的结果,蒙特卡罗预测,有和没有匹配的多部分子树级固定顺序计算。这些研究表明,强子对撞机事件的形状有显着的范围约束微扰和非微扰方面的强子对撞机QCD。各种计算方法之间的差异也突出了依赖于重正化和因子化尺度的同时变化在QCD预测中对不确定性进行可靠估计的局限性。我们还讨论了事件形状的多喷流事件,这是预计将出现在许多新的物理场景的拓扑结构的敏感性。

英文摘要:

We present results for matched distributions of a range of dijet event shapes at hadron colliders, combining next-to-leading logarithmic (NLL) accuracy in the resummation exponent, next-to-next-to leading logarithmic (NNLL) accuracy in its expansion and next-to-leading order (NLO) accuracy in a pure alpha_s expansion. This is the first time that such a matching has been carried out for hadronic final-state observables at hadron colliders. We compare our results to Monte Carlo predictions, with and without matching to multi-parton tree-level fixed-order calculations. These studies suggest that hadron-collider event shapes have significant scope for constraining both perturbative and non-perturbative aspects of hadron-collider QCD. The differences between various calculational methods also highlight the limits of relying on simultaneous variations of renormalisation and factorisation scale in making reliable estimates of uncertainties in QCD predictions. We also discuss the sensitivity of event shapes to the topology of multi-jet events, which are expected to appear in many New Physics scenarios.

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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