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arXiv 1806.03463hep-ph
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味道变化矢量和标量模型中的同号顶对加$W$产生

Same-sign top pair plus $W$ production in flavor changing vector and scalar models

Javad Ebadi, Fatemeh Elahi, Morteza Khatiri, Mojtaba Mohammadi Najafabadi

摘要:

我们探讨了LHC通过新的策略发现新的物理效应的前景,在同号顶对和同号顶对与$W$玻色子签名。同号顶夸克(加上一个$W$玻色子)的产生的显著增强是标准模型之外的几个模型的联合性质。我们专注于轻子(电子和μ子)衰变的顶夸克和研究排除达到的LHC数据的简化模型的方法,顶夸克的味道改变可能发生通过$Z'$或中性标量$ϕ$交换。在同号产生过程中,顶夸克轻子衰变模式的优点是背景贡献少,签名干净。一个组合上执行相同的符号顶部对和相同的符号顶部对加上一个$W$玻色子生产模式,使我们能够达到模型参数空间的很大一部分。假设新物理的耦合为$10^{-2}$量级,则可以排除味道改变的$Z'$或1 TeV以上的中性标量的质量。我们提出了一个动量依赖的电荷不对称性和角观测值在同号顶部过程中,这提供了新的物理信号分离的SM背景以及从$tcX$的味道改变$tuX$的歧视,其中$X = Z',ϕ$的可能性。

英文摘要:

We investigate the prospect of the LHC for discovering new physics effects via new strategies in the same-sign top pair and same-sign top pair associated with a $W$ boson signatures. Significant enhancement in production of same-sign top quarks (plus a $W$ boson) is a joint property of several models beyond the standard model. We concentrate on the leptonic (electron and muon) decay of the top quarks and study the exclusion reach of the LHC data for a simplified model approach where top quark flavor changing could occur through a $Z'$ or a neutral scalar $ϕ$ exchange. Less background contributions and clean signature are the advantages of the leptonic decay mode of the top quarks in the same-sign production processes. A combination is performed on both same-sign top pair and same-sign top pair plus a $W$ boson production modes which enables us to reach a large fraction of the model parameter space. Assuming the couplings of new physics of the order of $10^{-2}$, the mass of a flavor changing $Z'$ or a neutral scalar above 1 TeV could be excluded. We propose a momentum dependent charge asymmetry and angular observables in the same-sign top process which provide the possibility of separation of new physics signal from the SM backgrounds as well as discrimination of the flavor changing $tuX$ from $tcX$, where $X = Z',ϕ$.

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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