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arXiv 1608.00977hep-phhep-ex
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在当前和未来强子对撞机上解析胶子融合环

Resolving gluon fusion loops at current and future hadron colliders

Aleksandr Azatov, Christophe Grojean, Ayan Paul, Ennio Salvioni

摘要:

在大型强子对撞机上进行的包含性希格斯测量对胶子融合环的分辨率有限,无法区分顶夸克介导的长距离贡献和可能的短距离新物理效应。使用有效场论(EFT)的方法,我们比较了几种方法,以解除这种简并,包括$t\bar{t}h$和提升,离壳和双希格斯生产,并进行详细的预测,高亮度LHC和未来的强子对撞机。此外,我们重新审视离壳希格斯生产。首先,我们指出其修改的顶部$Z$耦合的敏感性,并通过一般的分析,我们表明,达到相当于树级过程,如$t\bar{t}Z$生产。复合希格斯模型的影响进行了讨论。其次,我们评估制度的有效性的EFT,执行一个简单的扩展标准模型包含一个矢量夸克明确的比较。

英文摘要:

Inclusive Higgs measurements at the LHC have limited resolution on the gluon fusion loops, being unable to distinguish the long-distance contributions mediated by the top quark from possible short-distance new physics effects. Using an Effective Field Theory (EFT) approach we compare several proposed methods to lift this degeneracy, including $t\bar{t}h$ and boosted, off-shell and double Higgs production, and perform detailed projections to the High-Luminosity LHC and a future hadron collider. In addition, we revisit off-shell Higgs production. Firstly, we point out its sensitivity to modifications of the top-$Z$ couplings, and by means of a general analysis we show that the reach is comparable to that of tree-level processes such as $t\bar{t}Z$ production. Implications for composite Higgs models are also discussed. Secondly, we assess the regime of validity of the EFT, performing an explicit comparison for a simple extension of the Standard Model containing one vector-like quark.

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