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arXiv 0903.3255hep-ph
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最小普适额外维模型中第二Kaluza-Klein规范玻色子在LHC的产生

Productions of second Kaluza-Klein gauge bosons in the minimal universal extra dimension model at LHC

Shigeki Matsumoto, Joe Sato, Masato Senami, Masato Yamanaka

备注：
21 pages, reference added, version to appear in PRD
发表信息：
Phys.Rev.D80:056006,2009
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摘要：

我们计算了LHC中第二个Kaluza-Klein（KK）光子$γ^{(2)}$和Z玻色子$Z^{(2)}$的产生率，包括了最小普适额外维（MUED）模型中所有重要的过程.为了区分MUED模型与LHC上其他TeV尺度模型，$γ^{(2)}$和$Z^{(2)}$起着至关重要的作用。为了讨论鉴别和计算它们的产生率，我们导出了包含顶部Yukawa耦合贡献的KK数破坏算子。利用这些算符，我们精确地计算了第二KK粒子的分支比。此外，我们还发现这些KK数破坏算符为$γ^{(2)}$和$Z^{(2)}$的产生提供了新的过程，如通过这些算符产生的第二个KK夸克的级联衰变.它们对它们的总生产率有很大贡献。特别地，这些生产过程对$1/R \gtrsim 800$ GeV的$γ^{(2)}$生产做出了主要贡献。结果，在积分亮度为100 fb的$^{-1}$的情况下，对于400 GeV和2000 GeV之间的致密化尺度，产生的$γ^{(2)}$和$Z^{(2)}$的数量估计为10 $^6$ - 10 $^2$。

英文摘要：

We calculate the production rates of the second Kaluza-Klein (KK) photon $γ^{(2)}$ and Z boson $Z^{(2)}$ at the LHC including all significant processes in the minimal Universal Extra Dimension (MUED) model. For discrimination of the MUED model from other TeV scale models at the LHC, $γ^{(2)}$ and $Z^{(2)}$ play a crucial role. In order to discuss the discrimination and calculate their production rates, we derive KK number violating operators including the contribution of the top Yukawa coupling. Using these operators, we accurately calculate branching ratios of second KK particles. In addition we find that these KK number violating operators provide new processes for $γ^{(2)}$ and $Z^{(2)}$ productions, such as cascade decay from second KK quarks produced through these operators. They have large contributions to their total production rates. In particular, these production processes give the dominant contribution for $γ^{(2)}$ production for $1/R \gtrsim 800$ GeV. As a result, with an integrated luminosity of 100 fb$^{-1}$, the number of produced $γ^{(2)}$ and $Z^{(2)}$ are estimated as 10$^6$ - 10$^2$ for the compactification scale between 400 GeV and 2000 GeV.

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