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arXiv 1207.6392hep-phhep-ex
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有无R-奇偶校验的自然逼真的NMSSM

Toward the Natural and Realistic NMSSM with and without R-Parity

Taoli Cheng, Jinmian Li, Tianjun Li, Xia Wan, You kai Wang, Shou-hua Zhu

摘要:

从目前ATLAS和CMS对希格斯玻色子质量和衰变率的计算结果来看,NMSSM明显优于MSSM。为了解释SM中的精细调谐问题,如规范层次问题和强CP问题,我们指出,超对称性不需要提供一个暗物质候选者,即,R-parity可以被破坏。因此,我们考虑了三种NMSSM情形:情形I和II中R宇称守恒,最轻的中性伴子遗迹密度分别在观测值附近和小于观测值,而情形III中R宇称被破坏。为了拟合所有的实验数据,我们考虑了χ^2分析,发现希格斯玻色子玻色子的质量和衰变率可以很好地解释在这些方案。考虑到小的χ^2值和2-3.7%(或1-2%)的微调,我们仅在场景III(或场景I和II)中获得具有轻(或相对重)超对称粒子谱的可行参数空间。由于单玻色子、希格斯玻色子和光阑一般都相对较轻,我们可以放松LHC超对称搜索的限制,但XENON 100实验在场景I和场景II中给出了很强的限制。在所有可行的参数空间中,μ子的反常磁矩(g_μ - 2)/2一般都很小。利用R宇称破缺,可以提高(g_μ - 2)/2,避免LHC超对称搜索和XENON 100实验的限制。因此,具有R-宇称破坏的情形III比情形I和情形II更自然和现实。

英文摘要:

From the current ATLAS and CMS results on Higgs boson mass and decay rates, the NMSSM is obviously better than the MSSM. To explain the fine-tuning problems such as gauge hiearchy problem and strong CP problem in the SM, we point out that supersymmetry does not need to provide a dark matter candidate, i.e., R-parity can be violated. Thus, we consider three kinds of the NMSSM scenarios: in Scenarios I and II R-parity is conserved and the lightest neutralino relic density is respectively around and smaller than the observed value, while in Scenario III R-parity is violated. To fit all the experimental data, we consider the χ^2 analyses, and find that the Higgs boson mass and decay rates can be explained very well in these Scenarios. Considering the small χ^2 values and fine-tuning around 2-3.7% (or 1-2%), we obtain the viable parameter space with light (or relatively heavy) supersymmetric particle spectra only in Scenario III (or in Scenarios I and II). Because the singlino, Higgsinos, and light stop are relatively light in general, we can relax the LHC supersymmetry search constraints but the XENON100 experiment gives a strong constraint in Scenarios I and II. In all the viable parameter space, the anomalous magnetic moment of the muon (g_μ - 2)/2 are generically small. With R-parity violation, we can increase (g_μ - 2)/2, and avoid the contraints from the LHC supersymmetry searches and XENON100 experiment. Therefore, Scenario III with R-parity violation is more natural and realistic than Scenarios I and II.

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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