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arXiv 0912.4150hep-ph
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LHC扩展模型中的极轻希格斯玻色子

Very Light Higgs Bosons in Extended Models at the LHC

Alexander Belyaev, Renato Guedes, Stefano Moretti, Rui Santos

摘要:

大型电子-正电子对撞机实验将标准模型(SM)希格斯玻色子的质量限制在114.4 GeV以上。这个界限适用于SM的所有扩展,其中希格斯玻色子玻色子与Z玻色子的耦合以及希格斯衰变轮廓与SM没有太大区别。然而,在扩展希格斯扇区的情况下,这种耦合可以通过适当选择模型参数而变得非常小。在这种情况下,最轻的CP-甚至希格斯玻色子玻色子的质量也可以变得非常小。这样一个非常轻的希格斯态,质量相当于Z玻色子的数量级,甚至更小,可能会逃过LEP的检测。在这项工作中,我们进行了详细的部分子水平上的可行性检测这样一个非常轻的希格斯粒子在大型强子对撞机(LHC)的生产过程中的pp \to h j \to τ^+ τ^- j,其中j是一个解决喷流的研究。我们的结论是,有几个模型,这样的希格斯状态可以检测到在大型强子对撞机的早期数据。

英文摘要:

The Large Electron-Positron (LEP) collider experiments have constrained the mass of the Standard Model (SM) Higgs boson to be above 114.4 GeV. This bound applies to all extensions of the SM where the coupling of a Higgs boson to the Z boson and also the Higgs decay profile do not differ much from the SM one. However, in scenarios with extended Higgs sectors, this coupling can be made very small by a suitable choice of the parameters of the model. In such cases, the lightest CP-even Higgs boson mass can in turn be made very small. Such a very light Higgs state, with a mass of the order of the Z boson one or even smaller, could have escaped detection at LEP. In this work we perform a detailed parton level study on the feasibility of the detection of such a very light Higgs particle at the Large Hadron Collider (LHC) in the production process pp \to h j \to τ^+ τ^- j, where j is a resolved jet. We conclude that there are several models where such a Higgs state could be detected at the LHC with early data.

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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