Electroweakinos in the Light of the Higgs Boson
Electroweakinos in the Light of the Higgs Boson
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DOI：
10.1103/physrevd.88.115010
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发表时间：
2013-09
影响因子：
5
通讯作者：
T. Han;S. Padhi;S. Su
中科院分区：
文献类型：
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作者：
T. Han;S. Padhi;S. Su
由于越来越严格的界限超对称性（SUSY）从大型强子对撞机的搜索，我们有动机探索的情况下，唯一可访问的超对称性状态是电弱中微子（charginos和neutralinos）。在最小超对称性框架下，我们系统地研究了根据高吉诺质量参数M_1、M_2和希格斯诺质量参数\mu的相对大小分类的三种一般情况，其中六种不同的情况，其中四种自然会导致几乎简并的LSP的压缩谱。我们提出了相关的衰变分支分数，并提供了深刻的理解与戈德斯通玻色子等价定理的衰变模式。我们展示了LHC和ILC中电弱子对产生的横截面，并强调了涉及标准模型类希格斯玻色子作为新的搜索参考的独特信号。从对产生和随后衰减到Wh/Zh（h到B\bar{B}）终态的电弱子信号可以产生95% C. L的灵敏度。在14 TeV的LHC上，在300 fb^{-1}的亮度下，M_2的质量标度为350-400 GeV（220-270 GeV）。结合所有其他衰变通道，95% C. L.排除（5 σ发现）可以扩展到M_2，μ ~ 480-700 GeV（320-500 GeV）。在ILC中，一旦越过运动学阈值，就可以很容易地发现电弱子，并且可以彻底研究它们的性质。
Given the increasingly more stringent bounds on Supersymmetry (SUSY) from the LHC searches, we are motivated to explore the situation in which the only accessible SUSY states are the electroweakinos (charginos and neutralinos). In the minimal SUSY framework, we systematically study the three general scenarios classified by the relative size of the gaugino mass parameters M_1, M_2 and the Higgsino mass parameter \mu, with six distinctive cases, four of which would naturally result in a compressed spectrum of nearly degenerate LSPs. We present the relevant decay branching fractions and provide insightful understanding about the decay modes in connection with the Goldstone-boson Equivalence Theorem. We show the cross sections for electroweakino pair production at the LHC and ILC, and emphasize the unique signals involving the Standard Model-like Higgs boson as a new search reference. The electroweakino signal from pair production and subsequent decay to Wh/Zh (h to b\bar{b}) final state may yield a sensitivity of 95% C.L. exclusion (5sigma discovery) to the mass scale M_2, \mu ~ 350-400 GeV (220-270 GeV) at the 14 TeV LHC with an luminosity of 300 fb^{-1}. Combining with all the other decay channels, the 95% C.L. exclusion (5sigma discovery) may be extended to M_2, \mu ~ 480-700 GeV (320-500 GeV). At the ILC, the electroweakinos could be readily discovered once the kinematical threshold is crossed, and their properties could be thoroughly studied.