在LHC上Tevatron ttbar不对称性和多喷流信号的轻轴流解释
Light axigluon explanation of the Tevatron ttbar asymmetry and multijet signals at the LHC
摘要：
在Tevatron上测量的ttbar不对称性在3 σ水平上仍然与标准模型的预测不一致。我们更新的状态的唯象轻轴胶子模型在解释的不对称数据，考虑到在Tevatron和LHC的ttbar截面的电荷不对称的约束。我们发现，轴胶子的质量在100和400 GeV之间提供了一个很好的适合的数据。最近的搜索由ATLAS和CMS的对生产的重共振衰减到dijets排除轴胶子与大分支分数dijets。然而，主要通过中间共振衰变为多喷流的轴胶子仍然是一种可能性。我们概述了四个不同的情况下，涵盖了最重要的衰变拓扑结构，并讨论了如何可能排除或发现轴胶子在大型强子对撞机的多射流共振。提供了每个场景的MadGraph实现。
英文摘要：
The ttbar asymmetry measured at the Tevatron continues to disagree with Standard Model predictions at the 3 sigma level. We update the status of the phenomenological light axigluon model in explaining the asymmetry data, taking into account constraints from the charge asymmetry at the LHC and the ttbar cross section at both Tevatron and LHC. We find that an axigluon with a mass between 100 and 400 GeV provides an excellent fit to the data. Recent searches by ATLAS and CMS for pair production of heavy resonances which decay to dijets rule out axigluons with large branching fractions to dijets. However axigluons which predominantly decay to multijets via intermediate resonances are still a possibility. We outline four distinct scenarios which cover the most important decay topologies and discuss how one might exclude or discover axigluons as multijet resonances at the LHC. MadGraph implementations for each of the scenarios are provided.
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