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arXiv 0801.4321hep-ph
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NMSSM的基准场景

Benchmark scenarios for the NMSSM

A. Djouadi, M. Drees, U. Ellwanger, R. Godbole, C. Hugonie, S. F. King, S. Lehti, S. Moretti, A. Nikitenko, I. Rottlaender, M. Schumacher, A. Teixeira

摘要:

我们讨论了约束和半约束版本的下一个-到-最小的超对称扩展的标准模型(NMSSM),其中一个单重态希格斯超场被添加到两个二重态超场的最小扩展(MSSM)。这导致了更丰富的希格斯和中性伴子光谱,并允许许多有趣的现象,不存在于MSSM。特别是,轻的希格斯粒子仍然被电流限制所允许,并且可能作为较重的希格斯态的衰变产物出现,这使得在LHC中寻找它们变得相当困难。我们提出了基准方案,解决新的现象学特征,符合目前的限制从对撞机和暗物质遗迹密度,并与(半-)通用软条款在大统一体规模。我们提出了相应的光谱希格斯粒子,他们的耦合规范玻色子和费米子和他们最重要的衰变分支比。简要介绍了在LHC上对这些态的搜索策略。

英文摘要:

We discuss constrained and semi--constrained versions of the next--to--minimal supersymmetric extension of the Standard Model (NMSSM) in which a singlet Higgs superfield is added to the two doublet superfields that are present in the minimal extension (MSSM). This leads to a richer Higgs and neutralino spectrum and allows for many interesting phenomena that are not present in the MSSM. In particular, light Higgs particles are still allowed by current constraints and could appear as decay products of the heavier Higgs states, rendering their search rather difficult at the LHC. We propose benchmark scenarios which address the new phenomenological features, consistent with present constraints from colliders and with the dark matter relic density, and with (semi--)universal soft terms at the GUT scale. We present the corresponding spectra for the Higgs particles, their couplings to gauge bosons and fermions and their most important decay branching ratios. A brief survey of the search strategies for these states at the LHC is given.

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