Structure of corrections to electroweak interactions in Higgsless models
Structure of corrections to electroweak interactions in Higgsless models
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DOI：
10.1103/physrevd.70.075008
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发表时间：
2004-06
影响因子：
5
通讯作者：
R. Chivukula;E. Simmons;H. He;M. Kurachi;M. Tanabashi
中科院分区：
文献类型：
--
作者：
R. Chivukula;E. Simmons;H. He;M. Kurachi;M. Tanabashi
最近，人们提出了关于电弱对称性破缺的无希格斯模型。基于紧化的五维规范理论，这些模型通过交换大量矢量玻色子而不是交换标量希格斯玻色子来实现电弱玻色子自相互作用的幺正性。在本文中，使用解构，我们分析的修正形式的电弱相互作用在一个大类的这些模型，允许任意的5-D几何形状，位置相关的规范耦合，和膜动能项。我们发现，许多模型在文献中考虑，包括那些最有可能是现象学上可行的，是在这一类。通过分析规范流关联函数在高动量下的渐近行为，在树水平上得到了相关关联函数的精确形式，并利用重矢量玻色子谱计算了对精细电弱观测量的修正.我们确定当非斜修正由于费米子与重矢量玻色子的相互作用变得重要，并指定这种相互作用的形式可以采取。特别地，我们发现在这类模型中，只要理论保持酉性，S-4cos{sup 2}{theta}{sub W}T>O（1），其中S和T是通常的斜参数。我们更同意Cacciapaglia等人的结果，即小的或负的S是可能的--尽管这只是以在树水平上大量的负T为代价。虽然我们强调我们的结果，因为它们适用于连续5-D模型，它们也适用于模型的扩展电弱规范对称性的动机模型隐藏的局部对称性。«少
Recently, Higgsless models of electroweak symmetry breaking have been proposed. Based on compactified five-dimensional gauge theories, these models achieve unitarity of electroweak boson self-interactions through the exchange of a tower of massive vector bosons rather than the exchange of a scalar Higgs boson. In this paper, using deconstruction, we analyze the form of the corrections to the electroweak interactions in a large class of these models, allowing for arbitrary 5-D geometry, position-dependent gauge coupling, and brane kinetic-energy terms. We show that many models considered in the literature, including those most likely to be phenomenologically viable, are in this class. By analyzing the asymptotic behavior of the correlation function of gauge currents at high momentum, we extract the exact form of the relevant correlation functions at tree level and compute the corrections to precision electroweak observables in terms of the spectrum of heavy vector bosons. We determine when nonoblique corrections due to the interactions of fermions with the heavy vector bosons become important, and specify the form such interactions can take. In particular, we find that in this class of models, so long as the theory remains unitary, S-4cos{sup 2}{theta}{sub W}T>O(1), where S and T are the usual oblique parameters. Wemore » concur with the result of Cacciapaglia et al. that small or negative S is possible--though only at the expense of substantial negative T at tree level. Although we stress our results as they apply to continuum 5-D models, they apply also to models of extended electroweak gauge symmetries motivated by models of hidden local symmetry.« less