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arXiv 1409.0409hep-phhep-ex
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LHC顶级合作伙伴联盟超过2个TeV质量区域

LHC Top Partner Searches Beyond the 2 TeV Mass Region

Mihailo Backović, Thomas Flacke, Seung J. Lee, Gilad Perez

摘要:

我们提出了一个新的搜索策略,在LHC运行-II的早期阶段,基于轻子喷流的最终状态的重顶合作伙伴。我们的研究结果表明,除了顶夸克和可能的前向喷流之外,包含助推的大质量喷流和硬轻子的最终状态为探测和测量质量为$\sim 2$ TeV的顶级伙伴提供了一个新的窗口。我们得到的信号的意义是可比的或优于相同的符号双轻子通道的顶级合作伙伴的质量大于约1 TeV。与双轻子通道不同,我们提出的选择标准对$5/3$和$1/3$电荷顶部伙伴都敏感,并且允许共振质量峰的完全重建。我们的搜索策略利用一个简化的$b$标记过程和模板重叠方法来标记大量的提升对象,并拒绝相应的背景。此外,我们提出了一个新的,堆积不敏感的方法,标记前喷流的特征,我们的信号事件。我们认为,在50个相互作用每束交叉堆积污染的全部影响。我们证明,即使在最悲观的堆积的情况下,我们获得的意义是足以声称发现在广泛的顶级合作伙伴参数。虽然我们专注于最小的自然复合希格斯模型,本文的结果可以很容易地转化为任何重伙伴与$t\bar{t}Wj$的最终状态拓扑的界限。

英文摘要:

We propose a new search strategy for heavy top partners at the early stages of the LHC run-II, based on lepton-jet final states. Our results show that final states containing a boosted massive jet and a hard lepton, in addition to a top quark and possibly a forward jet, offer a new window to both detecting and measuring top partners of mass $\sim 2$ TeV. Our resulting signal significance is comparable or superior to the same sign di-lepton channels for top partner masses heavier than roughly 1 TeV. Unlike the di-lepton channel, the selection criteria we propose are sensitive both to $5/3$ and $1/3$ charge top partners and allow for full reconstruction of the resonance mass peak. Our search strategy utilizes a simplified $b$-tagging procedure and the Template Overlap Method to tag the massive boosted objects and reject the corresponding backgrounds. In addition, we propose a new, pileup insensitive method, to tag forward jets which characterize our signal events. We consider full effects of pileup contamination at 50 interactions per bunch crossing. We demonstrate that even in the most pessimistic pileup scenarios, the significance we obtain is sufficient to claim a discovery over a wide range of top partner parameters. While we focus on the minimal natural composite Higgs model, the results of this paper can be easily translated into bounds on any heavy partner with a $t\bar{t}Wj$ final state topology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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