Electroweak symmetry breaking and precision tests with a fifth dimension
Electroweak symmetry breaking and precision tests with a fifth dimension
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第五维电弱对称破缺和精密测试
DOI：
10.1016/j.nuclphysb.2006.10.032
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Wulzer
中科院分区：
文献类型：
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作者：
G. Panico;M. Serone;A. Wulzer
我们对最近提出的R4×S1/Z2上的五维模型进行了稍微改进，其中Higgs是规范场的内部分量，Lorentz对称性在第五维中被破缺，对风味和CP守恒的电弱观测量进行了全面的研究。有趣的是，对电弱可观测量的相关修正是普适的，本质上只依赖于希格斯质量的值和新物理学的尺度，在我们的例子中是紧化尺度1/R。该模型通过了90% C.L.下1/R = 4.7 TeV的所有约束，对参数进行适度的微调。希格斯粒子的质量总是小于200 GeV，尽管由于T参数的大修正，更高的值是允许的。模型中最轻的非SM态通常是质量为1-2 TeV的有色费米子。
We perform a complete study of flavor and CP conserving electroweak observables in a slight refinement of a recently proposed five-dimensional model on R4×S1/Z2, where the Higgs is the internal component of a gauge field and the Lorentz symmetry is broken in the fifth dimension. Interestingly enough, the relevant corrections to the electroweak observables turn out to be of universal type and essentially depend only on the value of the Higgs mass and on the scale of new physics, in our case the compactification scale 1/R. The model passes all constraints for 1/R⩾4.7 TeV at 90% C.L., with a moderate fine-tuning in the parameters. The Higgs mass turns out to be always smaller than 200 GeV although higher values would be allowed, due to a large correction to the T parameter. The lightest non-SM states in the model are typically colored fermions with a mass of order 1–2 TeV.