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LHC运行2数据中托泊铵形成的特征

Signatures of toponium formation in LHC run 2 data

Benjamin Fuks, Kaoru Hagiwara, Kai Ma, Ya-Juan Zheng

备注：
6 pages, 2 figures and 2 tables; matches published version
发表信息：
Phys. Rev. D 104, 034023 (2021)
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摘要：

我们研究报告的观测和理论预测之间的偏差与生产的一对双轻子衰变顶夸克在大型强子对撞机，我们研究的可能性，他们反映了toponium形成的信号。我们研究了顶夸克和反顶夸克的色单重自旋为0的toponium $η_t$束缚态的胶子融合产生，然后双轻子衰变（$gg\toη_t \to \bar\ell \ell b \bar{b} ν\barν$）。我们发现强的相关性有利于生产的双轻子系统具有小的角度分离的方位角和一个小的不变质量。虽然toponium生产只占总顶夸克对生产截面在13 TeV的大型强子对撞机的0.8%，有一种可能性，它可以解释观察到的过剩在相空间的窄边。我们提出了一种方法来发现toponium形成的“重建”其顶部和反顶夸克成分的双轻子通道。

英文摘要：

We study reported deviations between observations and theoretical predictions associated with the production of a pair of di-leptonically decaying top quarks at the LHC, and we examine the possibility that they reflect a signal of toponium formation. We investigate the production by gluon fusion of a color-singlet spin-0 toponium $η_t$ bound state of a top and anti-top quark, that then decays di-leptonically ($gg\toη_t \to \bar\ell \ell b \bar{b} ν\barν$). We find strong correlations favoring the production of di-lepton systems featuring a small angular separation in azimuth and a small invariant mass. Although toponium production only contributes to 0.8% of the total top-quark pair-production cross section at the 13 TeV LHC, there is a possibility that it can account for observed excesses in the narrow edges of phase space. We propose a method to discover toponium formation by `reconstructing' both its top and anti-top quark constituents in the di-lepton channel.

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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