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arXiv 1107.4364hep-phhep-ex
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Tevatron Top $A_{FB}$与LHC Top Physics

Tevatron Top $A_{FB}$ Versus LHC Top Physics

Moira I. Gresham, Ian-Woo Kim, Kathryn M. Zurek

摘要:

我们进行了全面的分析模型的顶部A_{FB}在CDF在新的顶部数据来自大型强子对撞机。我们开始一个仔细的Tevatron分析,考虑在一般情况下,有效的顶点集产生一个大的向前向后的不对称性,同时抑制的贡献,总的T tbar横截面。我们表明,一般的理由,标量模型的斗争,以产生足够的不对称性与CDF的意见一致,而矢量模型可以产生一个大的不对称性与一个不太重要的张力在总截面和$t\bar{t}$不变的质量分布在Tevatron。我们用1 fb^{-1}的数据检验了LHC 7顶级物理模型的基本观测值,包括总截面、不变质量分布和t tbar事件中附加喷流的数量。在t-通道介质的情况下,LHC的总截面对轻介质有很强的约束,而Tevatron不变质量分布对能够产生不对称性的重介质有很强的约束。重轴胶子越来越多地被LHC 7的t tbar和dijet共振搜索挤压。我们得出结论,LHC 7 top分析正在迅速关闭CDF top A_{FB}可行模型的窗口。

英文摘要:

We carry out a comprehensive analysis of models for top A_{FB} at CDF in light of new top data arriving from the LHC. We begin with a careful Tevatron analysis, considering in general which sets of effective vertices give rise to a large forward-backward asymmetry while suppressing the contribution to the total t tbar cross-section. We show on general grounds that scalar models struggle to produce sufficient asymmetries consistent with CDF observations, while vector models can produce a large asymmetry with a less significant tension in the total cross-section and $t\bar{t}$ invariant mass distribution at the Tevatron. We examine the essential observables of these models for top physics at LHC7 with 1 fb^{-1} of data, including the total cross-section, invariant mass distribution and number of additional jets in t tbar events. In the case of t-channel mediators, the LHC total cross-section places a strong constraint on light mediators, while the Tevatron invariant mass distributions place strong constraints on heavy mediators that are able to produce the asymmetry. Heavy axigluons are becoming increasingly squeezed by LHC7 t tbar and dijet resonance searches. We conclude that LHC7 top analyses are rapidly closing the window for viable models of the CDF top A_{FB}.

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