LHC ttbar事件中的碰撞搜索
Bump-hunting in LHC ttbar events
摘要：
我们证明了一个有目的的归一化NNLO顶对不变质量微分谱可以有很小的理论不确定性，特别是，一个小的灵敏度顶夸克质量。因此，这种观测可以是一个非常有效的碰撞狩猎工具，共振衰减到顶部对事件在LHC运行II及以后。为了说明这种方法是如何工作的，我们集中在一个具体的例子，目前的利益，即可能的750 GeV的二-伽马过剩共振Φ。仅考虑理论上的不确定性，我们证明了有可能将最近文献[Hespel，Maltoni和Vryonidou，arXiv：1606.04149]中研究的pp -> Phi -> tt信号与具有非常高显著性的纯SM背景区分开。或者，在未观察到的情况下，可以对衰减速率Phi -> tt设置强上限。
英文摘要：
We demonstrate that a purposefully normalised NNLO top pair invariant mass differential spectrum can have very small theoretical uncertainty and, in particular, a small sensitivity to the top quark mass. Such observable can thus be a very effective bump-hunting tool for resonances decaying to top pair events during LHC Run II and beyond. To illustrate how the approach works, we concentrate on one specific example of current interest, namely, the possible 750 GeV di-gamma excess resonance Phi. Considering only theoretical uncertainties, we demonstrate that it is possible to distinguish pp -> Phi -> tt signals studied in the recent literature [Hespel, Maltoni and Vryonidou, arXiv:1606.04149] from the pure SM background with very high significance. Alternatively, in case of non-observation, a strong upper limit on the decay rate Phi -> tt can be placed.
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