New Aspects of Gauge-Boson Couplings and the Higgs Sector
New Aspects of Gauge-Boson Couplings and the Higgs Sector
复制标题
规范玻色子耦合和希格斯扇区的新方面
DOI：
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发表时间：
2004
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通讯作者：
F. Nagel
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文献类型：
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作者：
F. Nagel
标准模型将在未来的线性e+ e对撞机上被探索，以确定它在高能下的有效性及其可能的扩展。作为一个例子，我们研究了多希格斯双重模型的势的稳定性和自发的电弱对称性破缺。此外，在规范玻色子部门的新物理效应的模型无关的参数化的两种方法进行了研究。在e+ e-> WW -> 4费米子过程中线性对撞机上三规范玻色子耦合的形状因子方法中，通过最佳观测量确定了28个参数的最强可能界限。分析了光束纵向或横向偏振对灵敏度的改善。耦合的一个线性组合只能用横向极化来测量。公式的应用程序中的通用模糊度的情况下，在最终状态的重建的最佳可观的。在一个有效的拉格朗日方法规范玻色子希格斯扇区10维6运营商添加到标准模型的拉格朗日。在电弱对称破缺后，它们对规范玻色子自耦合、规范玻色子-希格斯顶点和规范玻色子质量都有贡献。从LEP观测值的异常参数的约束。有效的三规范玻色子耦合的定义，使得从形状因子的方法可以被翻译到有效的拉格朗日方法的界限。
The Standard Model will be probed at future linear e+ e- colliders for its validity at high energies and for its possible extensions. As an example we investigate Multi-Higgs-Doublet Models with respect to the stability of their potential and to spontaneous electroweak symmetry breaking. Further, two approaches to the model-independent parameterisation of new-physics effects in the gauge-boson sector are studied. In a form-factor approach to three-gauge-boson couplings at linear colliders in the process e+ e- ---> WW ---> 4 fermions the strongest possible bounds on the 28 parameters are determined by means of optimal observables. The improvement in sensitivity by longitudinal or transverse beam polarisation is analysed. One linear combination of couplings can be measured only with transverse polarisation. Formulae for the application of optimal observables in case of generic ambiguities in the reconstruction of final states are provided. In an effective-Lagrangian approach to the gauge-boson-Higgs sector ten dimension-six operators are added to the Lagrangian of the Standard Model. After electroweak symmetry breaking they contribute to gauge-boson self-couplings, gauge-boson-Higgs vertices and gauge-boson masses. Constraints from LEP observables on the anomalous parameters are derived. Effective three-gauge-boson couplings are defined such that the bounds from the form-factor approach can be translated to the effective-Lagrangian approach.