Fully radiative electroweak symmetry breaking
Fully radiative electroweak symmetry breaking
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全辐射电弱对称性破缺
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
S. Park
中科院分区：
文献类型：
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作者：
G. Cacciapaglia;C. Csáki;S. Park
在额外维度中的规范-希格斯统一模型提供了一个非常优雅的操场，人们可以在那里研究电弱对称性破缺。Higgs势是完全辐射产生的，体费米子的贡献将导致真空期望值。一个普遍的问题是四次标量耦合太低，导致希格斯粒子的VEV太接近紧致化尺度，而希格斯粒子的质量太轻。在本文中，我们表明，这是可能的，以解决这些问题在一个最小的情况下，在平坦的空间中的希格斯势之间的不同的散装费米子的贡献取消。反周期费米子扮演了一个关键的角色：抵消不是微调的结果，而是由费米子的表示和宇称的选择决定的。我们还表明，引入一个相对较大的代表性，可以帮助实现足够重的顶部。在这种情况下，强耦合尺度被降低到一个边缘可接受的值，和两个回路效应的更仔细的分析应该决定，如果理论仍然在扰动控制。
Models of Gauge-Higgs unification in extra dimensions offer a very elegant playground where one can study electroweak symmetry breaking. The Higgs potential is fully radiatively generated and the contribution of bulk fermions will induce a vacuum expectation value. A generic problem is that the quartic scalar coupling is too low, resulting in a Higgs VEV that is too close to the compactification scale, and a Higgs mass that is too light. In this paper we show that it is possible to solve these problems in a minimal scenario in flat space by cancellations in the Higgs potential between the contribution of different bulk fermions. A crucial role is played by antiperiodic fermions: the cancellation is not the result of a fine tuning, but rather dictated by the choice of representations and parities of the fermions. We also show that introducing a relatively large representation can help in achieving a sufficiently heavy top. In this case, the strong coupling scale is lowered to a marginally acceptable value, and a more careful analysis of two loop effects should decide if the theory remains under perturbative control.