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arXiv 1302.7033hep-ph
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MSSM希格斯玻色子在LHC的实验研究:类希格斯粒子发现后的基准方案

MSSM Higgs Boson Searches at the LHC: Benchmark Scenarios after the Discovery of a Higgs-like Particle

M. Carena, S. Heinemeyer, O. Stål, C. E. M. Wagner, G. Weiglein

摘要:

在LHC中发现了一种质量约为125.5 GeV的类希格斯粒子。在目前的实验不确定性,这个新的状态是兼容的预测标准模型(SM)希格斯玻色子和希格斯部门在最小超对称标准模型(MSSM)。我们提出了新的低能量MSSM基准场景,在很宽的参数范围内,与所观察到的信号的质量和生产率兼容。这些场景也表现出有趣的现象MSSM希格斯部门。我们提出了一个稍微更新的版本的著名的mh-最大的情况下,和一个修改的情况下(mh-mod),轻CP-甚至希格斯玻色子玻色子可以解释为LHC信号在大部分的MA-tan β平面。此外,我们定义了一个导致最轻CP-偶Higgs胶子融合率被抑制的光停止场景,以及一个在大tan β下具有增强的h到γγ衰变率的光stau场景。我们还提出了一个恐惧τ的希格斯场景,其中最轻的希格斯粒子可以抑制向下型费米子的耦合。我们建议在其中一些场景中使用两个符号的附加值来补充μ参数的指定值。这对寻找非SM类MSSM希格斯玻色子玻色子的解释有重大影响。我们还讨论了灵敏度的搜索重希格斯衰变成轻charginos和neutralinos,和衰变的形式H HH。最后,除了最轻的CP偶希格斯玻色子被解释为LHC信号的所有其他方案之外,我们提出了一种低MH方案,在该方案中,重CP偶希格斯玻色子对应于125.5 GeV左右的新状态。

英文摘要:

A Higgs-like particle with a mass of about 125.5 GeV has been discovered at the LHC. Within the current experimental uncertainties, this new state is compatible with both the predictions for the Standard Model (SM) Higgs boson and with the Higgs sector in the Minimal Supersymmetric Standard Model (MSSM). We propose new low-energy MSSM benchmark scenarios that, over a wide parameter range, are compatible with the mass and production rates of the observed signal. These scenarios also exhibit interesting phenomenology for the MSSM Higgs sector. We propose a slightly updated version of the well-known mh-max scenario, and a modified scenario (mh-mod), where the light CP-even Higgs boson can be interpreted as the LHC signal in large parts of the MA-tan β plane. Furthermore, we define a light stop scenario that leads to a suppression of the lightest CP-even Higgs gluon fusion rate, and a light stau scenario with an enhanced decay rate of h to γγ at large tan β. We also suggest a τ-phobic Higgs scenario in which the lightest Higgs can have suppressed couplings to down-type fermions. We propose to supplement the specified value of the μ parameter in some of these scenarios with additional values of both signs. This has a significant impact on the interpretation of searches for the non SM-like MSSM Higgs bosons. We also discuss the sensitivity of the searches to heavy Higgs decays into light charginos and neutralinos, and to decays of the form H to hh. Finally, in addition to all the other scenarios where the lightest CP-even Higgs is interpreted as the LHC signal, we propose a low-MH scenario, where instead the heavy CP-even Higgs boson corresponds to the new state around 125.5 GeV.

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