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arXiv 1202.6231hep-phhep-ex
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从最近的LHC数据看普适额外维中ILC处的Higgs

Higgs at ILC in Universal Extra Dimensions in Light of Recent LHC Data

Takuya Kakuda, Kenji Nishiwaki, Kin-ya Oda, Naoya Okuda, Ryoutaro Watanabe

摘要:

考虑到Kaluza-Klein(KK)环对主要胶子融合产生和双光子/双胶子衰变的影响,我们从大型强子对撞机最新的希格斯粒子搜索数据中给出了所有已知的普适额外维模型的边界.根据不同的模型,KK标度的下限从500 GeV到1 TeV。我们发现,希格斯粒子产生的截面与随后的双光子衰变可以增强1.5倍,在这个实验范围内,与希格斯粒子的质量在115 GeV和130 GeV之间的依赖性很小。我们还表明,在这种情况下,希格斯衰变到双光子最终状态的分支比可以被抑制的一个因素80%,这是勉强观察到的高能量/光度选项在国际直线对撞机。在光子-光子对撞机上,希格斯粒子的产生截面也可以被抑制90%,这完全在预期的实验范围内。

英文摘要:

We present bounds on all the known universal extra dimension models from the latest Higgs search data at the Large Hadron Collider, taking into account the Kaluza-Klein (KK) loop effects on the dominant gluon-fusion production and on the diphoton/digluon decay. The lower bound on the KK scale is from 500GeV to 1TeV depending on the model. We find that the Higgs production cross section with subsequent diphoton decay can be enhanced by a factor 1.5 within this experimental bound, with little dependence on the Higgs mass in between 115GeV and 130GeV. We also show that in such a case the Higgs decay branching ratio into a diphoton final state can be suppressed by a factor 80%, which is marginally observable at a high energy/luminosity option at the International Linear Collider. The Higgs production cross section at a photon-photon collider can also be suppressed by a similar factor 90%, being well within the expected experimental reach.

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