arXiv 1101.06702011-01hep-ph

最小宇宙额外维模型中的第二个Kaluza-Klein中性希格斯玻色子

The second Kaluza-Klein neutral Higgs bosons in the minimal Universal Extra Dimension model

Sanghyeon Chang, Kang Young Lee, Jeonghyeon Song

备注：: 22 pages, 7 figures
发表信息：: Phys. Lett. B 708 (2012) 144
DOI：: 10.1016/j.physletb.2012.01.047

摘要：

环诱导中性希格斯玻色子衰变为一对胶子或光子对在LHC发现希格斯有很大的意义。然而，如果希格斯玻色子的质量大于$\sim 500\gev$，那么这些辐射分支比在标准模型（SM）中会受到很大的抑制，因为新的衰变通道在运动学上是开放的。我们注意到，这些辐射衰变可以是相当大的重CP奇第二卡鲁扎-克莱因（KK）模式的希格斯玻色子，$χ^\tw$，在最小的通用额外维模型：高度简并的质量谱的理论禁止占主导地位的KK数守恒衰变到第一KK模式的$W$，$Z$和顶夸克。我们发现在单圈水平上$h^{(2)} \to g g$的CP偶衰变是不存在的，这是因为$h^{(2)}$与$t_{1,2}^\on$的不同质量本征态耦合，而胶子与相同质量本征态耦合。在大型强子对撞机上的$h^\tw$生产受到了很大的抑制。相反，过程$ gg \to χ^\tw \to γγ$在一个最佳的情况下，可以观察到可管理的SM背景在大型强子对撞机。

英文摘要：

Loop-induced decay of a neutral Higgs boson into a pair of gluons or photons has great implications for the Higgs discovery at the LHC. If the Higgs boson is heavy with mass above $\sim 500\gev$, however, these radiative branching ratios are very suppressed in the standard model (SM), as the new decay channels are kinematically open. We note that these radiative decays can be sizable for the heavy CP-odd second Kaluza-Klein (KK) mode of the Higgs boson, $χ^\tw$, in the minimal universal extra dimension model: highly degenerate mass spectrum of the theory prohibits kinematically the dominant KK-number-conserving decays into the first KK modes of the $W$, $Z$ and top quark. We find that the CP-even decay of $h^{(2)} \to g g$ is absent at one-loop level since $h^{(2)}$ couples with different mass eigenstates of $t_{1,2}^\on$ while a gluon does with the same mass eigenstates. The $h^\tw$ production at the LHC is very suppressed. On the contrary, the process $ gg \to χ^\tw \to γγ$ in an optimal scenario can be observed with manageable SM backgrounds at the LHC.

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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