Four-lepton LHC events from MSSM Higgs boson decays into neutralino and chargino pairs

Four-lepton LHC events from MSSM Higgs boson decays into neutralino and chargino pairs
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来自 MSSM 希格斯玻色子的四轻子大型强子对撞机事件衰变为中性子和电荷子对

DOI:
10.1088/1126-6708/2009/08/037
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发表时间:
2007-09
影响因子:
5.4
通讯作者:
--
中科院分区:
物理与天体物理2区
文献类型:
--
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在最小超对称标准模型的背景下,研究了在大型强子对撞机上重中性希格斯玻色子的产生和衰变为中性伴子和电荷伴子对。希格斯玻色子衰变到较重的中性伴子和电荷伴子状态,即,H0,A0?X20、X30、X20、X40、X30、X30、X40、X40X40以及H0、A0?1±X2,X2+X2?(all导致四轻子加上失踪的横向能量的最终状态),发现提高发现这种希格斯状态的可能性超出了以前确定的考虑H0,A0?X20X20只会衰变。特别是,H0,A0玻色子相当重的质量,接近约800 GeV的所谓的“去耦区域”,没有明确的SM签名较重的MSSM希格斯玻色子已知存在,现在可以辨别,为适当的,但不是特别限制性的配置的低能量超对称参数。因此,可以极大地扩展H0和A0的高MA发现范围。完整的事件发生器级模拟,包括现实的检测器的影响和所有重要的背景分析,进行划定潜在的H0,A0的发现区域。楔形盒图技术也被用来进一步分析的4?加上缺失的横向能量信号和背景事件。这项研究标志着第一次彻底和合理完整的分析这一类重要的MSSM希格斯玻色子签名模式。事实上,这是第一次发现包括希格斯玻色子所有可能的中性伴子和电荷伴子衰变模式的区域。
Heavy neutral Higgs boson production and decay into neutralino and chargino pairs is studied at the Large Hadron Collider in the context of the minimal supersymmetric standard model. Higgs boson decays into the heavier neutralino and chargino states, i.e., H0,A0?X20,X30,X20,X40,X30,X30,X30,X40,X40X40 as well as H0,A0?1±X2,X2+X2? (all leading to four-lepton plus missing transverse energy final states), is found to improve the possibilities of discovering such Higgs states beyond those previously identified by considering H0,A0?X20X20 decays only. In particular, H0,A0 bosons with quite heavy masses, approaching ~ 800 GeV in the so-called `decoupling region' where no clear SM signatures for the heavier MSSM Higgs bosons are known to exist, can now be discerned, for suitable but not particularly restrictive configurations of the low energy supersymmetric parameters. The high MA discovery reach for the H0 and A0 may thus be greatly extended. Full event-generator level simulations, including realistic detector effects and analyses of all significant backgrounds, are performed to delineate the potential H0,A0 discovery regions. The wedgebox plot technique is also utilized to further analyze the 4? plus missing transverse energy signal and background events. This study marks the first thorough and reasonably complete analysis of this important class of MSSM Higgs boson signature modes. In fact, this is the first time discovery regions including all possible neutralino and chargino decay modes of the Higgs bosons have ever been mapped out.
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