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arXiv 1612.00643hep-phhep-ex
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从标量顶对共振中寻找新物理

Searching for New Physics in Scalar Top-Pair Resonance

Jérémie Quevillon

摘要:

我们考虑了在LHC碰撞中胶子融合产生一个或两个新的自旋为零的共振粒子$Φ$衰变为顶夸克对的效应。我们回顾了以前的分析之间的干扰重费米子环诱导的$gg \rightarrow Φ\rightarrow t\bar{t}$信号和连续QCD背景$gg \rightarrow t\bar{t}$。我们表明,在标准模型费米子的存在下,只有在$gg \rightarrow Φ$环路,干涉效应是破坏性的,导致下降的$t \bar t$质量分布。包括新物理学,如额外的矢量夸克,导致一个完全不同的图片,因为线形可以被峰和谷扭曲。目前,在ATLAS和CMS数据中缺乏这种效应限制了$Φ$状态的产生和衰变的模型。

英文摘要:

We consider the effects in the production via gluon fusion in LHC collisions of one or two spin-zero new resonant particles $Φ$ that decay into a top quark pair. We revisit previous analyses of the interferences between the heavy-fermion loop-induced $gg \rightarrow Φ\rightarrow t\bar{t}$ signal and the continuum QCD background $gg \rightarrow t\bar{t}$. We show that in the presence of standard model fermions only in the $gg \rightarrow Φ$ loops, the interference effect is destructive causing a dip in the $t \bar t$ mass distribution. Including New Physics such as additional vector-like quarks leads to a totally different picture as the line-shape can be distorted by peaks and dips. For the time being, the absence of such effects in ATLAS and CMS data constrain models of the production and decays of the $Φ$ state(s).

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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