论文标题
矢量般的顶级伴侣腐烂到单身玻色子的发现前景
Discovery prospects of a vectorlike top partner decaying to a singlet boson
论文作者
论文摘要
矢量般的顶级伴侣可能衰减到新的无色弱弱鳞片标量或伪内科的可能性引起了文献中的一些关注。我们调查了弱弹力费用的生产-2/3 $ $ t $ Quark，该Quark可能会腐烂到LHC的无旋玻璃孔（$φ$）和顶级夸克。早些时候，在2203.13753中，我们已经证明，在参数空间的很大一部分中，$ t \ totφ$和环路诱导的$φ\ to gg $衰减成为这些粒子的主要衰减模式。在这里，我们通过上述衰减调查了该地区$ t $夸克的发现前景。特别是，我们专注于$ pp \ to tt \ to（tφ）（tφ）\ to（t（gg））\，（t（gg））$通道。将此信号与巨大的标准模型背景区分开是一项艰巨的任务，迫使我们采用多元机器学习技术。我们发现，上面的通道可以是上述衰减链占主导地位的参数空间的大部分中的顶级伙伴的发现通道。我们的分析在很大程度上是独立于模型的，因此我们的结果在广泛的新物理模型中很有用。
The possibility of a vectorlike top partner decaying to a new colourless weak-singlet scalar or pseudoscalar has attracted some attention in the literature. We investigate the production of a weak-singlet charge-$2/3$ $T$ quark that can decay to a spinless boson ($Φ$) and a top quark at the LHC. Earlier, in 2203.13753, we have shown that in a large part of the parameter space, the $T\to tΦ$ and the loop-induced $Φ\to gg$ decays become the dominant decay modes for these particles. Here, we investigate the discovery prospects of the $T$ quark in this region through the above decays. In particular, we focus on the $pp\to TT\to (tΦ)(tΦ)\to (t(gg))\,(t(gg))$ channel. Separating this signal from the huge Standard Model background is a challenging task, forcing us to employ a multivariate machine-learning technique. We find that the above channel can be a discovery channel of the top partner in the large part of the parameter space where the above decay chain dominates. Our analysis is largely model-independent, and hence our results would be useful in a broad class of new physics models.
