arXiv 1409.18972014-09-05hep-ph

Higgs介导的Z对加喷流产生的干涉效应

Interference effects for Higgs-mediated Z-pair plus jet production

John M. Campbell, R. Keith Ellis, Elisabetta Furlan, Raoul Röntsch

备注：: 18 pages, 6 figures
发表信息：: Phys. Rev. D 90, 093008 (2014)
DOI：: 10.1103/PhysRevD.90.093008

摘要：

我们研究的生产通道ZZ +喷流的干扰效应，特别是专注于希格斯玻色子的作用。这个产生通道既有希格斯玻色子通过衰变$H \to ZZ$介导的图（信号图），也有Z玻色子直接耦合到夸克环的图（背景图）。我们考虑部分子过程$gggZZ$和$gq \bar{q} ZZ$，其中信号和背景图之间的干扰首先发生。由于干涉主要是对希格斯玻色子玻色子的非共振效应，我们把Z玻色子当作壳层上的。因此，我们的分析仅限于阈值以上的区域，其中Z对的不变质量$m_{ZZ}$满足条件$m_{ZZ}>2m_Z$。在$m_{ZZ} > 300$ GeV区域，我们发现ZZ +喷流通道中的干涉定性地类似于包含性ZZ通道中的干涉。此外，一旦喷流分组数据可用，这些速率足以在LHC上研究这些效应。

英文摘要：

We study interference effects in the production channel ZZ + jet, in particular focusing on the role of the Higgs boson. This production channel receives contributions both from Higgs boson-mediated diagrams via the decay $H \to ZZ$ (signal diagrams), as well as from diagrams where the Z-bosons couple directly to a quark loop (background diagrams). We consider the partonic processes $gggZZ$ and $gq \bar{q} ZZ$ in which interference between signal and background diagrams first occurs. Since interference is primarily an off-resonant effect for the Higgs boson, we treat the Z-bosons as on-shell. Thus our analysis is limited to the region above threshold, where the invariant mass of the Z-pair, $m_{ZZ}$, satisfies the condition $m_{ZZ}>2m_Z$. In the region $m_{ZZ} > 300$ GeV we find that the interference in the ZZ + jet channel is qualitatively similar to interference in the inclusive ZZ channel. Moreover, the rates are sufficient to study these effects at the LHC once jet-binned data become available.

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摘要：

英文摘要：

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