A Three site Higgsless model
A Three site Higgsless model
复制标题
DOI：
10.1103/physrevd.74.075011
复制
发表时间：
2006-07
影响因子：
5
通讯作者：
R. Chivukula;Baradhwaj Coleppa;S. Chiara;E. Simmons;H. He;M. Kurachi;M. Tanabashi
中科院分区：
文献类型：
--
作者：
R. Chivukula;Baradhwaj Coleppa;S. Chiara;E. Simmons;H. He;M. Kurachi;M. Tanabashi
我们分析了只有三个点的高度解构的希格斯模型的光谱和性质。这样的模型包含了足够的复杂性，可以包含与费米子质量和电弱观测相关的有趣物理问题，但仍然足够简单，可以在矩阵元素生成器程序中编码，用于蒙特卡罗模拟。该模型的规范扇区与强破缺电弱对称（BESS）模型的规范扇区相当；这里的新物理学感兴趣的是费米子扇区。我们分析了产生理想的费米子离域所需的费米子汤川耦合的形式，该离域导致树级精度电弱修正消失。我们讨论了对$b\ensuremath{\rightarrow}s\ensuremath{\gamma}$的单环修正的大小，弱同位旋违反参数$\ensuremath{\alpha}T$和衰变$Z\ensuremath{\rightarrow}b\overline{b}$。我们发现新的费米恐矢量态（类似于连续介质模型中的测量-玻色子Kaluza-Klein模式）可以相当轻，质量低至380 GeV，而额外的（近似矢量的）夸克和轻子态（类似于费米子Kaluza-Klein模式）必须比1.8 TeV重。
We analyze the spectrum and properties of a highly deconstructed Higgsless model with only three sites. Such a model contains sufficient complexity to incorporate interesting physics issues related to fermion masses and electroweak observables, yet remains simple enough that it could be encoded in a Matrix Element Generator program for use with Monte Carlo simulations. The gauge sector of this model is equivalent to that of the Breaking Electroweak Symmetry Strongly (BESS) model; the new physics of interest here lies in the fermion sector. We analyze the form of the fermion Yukawa couplings required to produce the ideal fermion delocalization that causes tree-level precision electroweak corrections to vanish. We discuss the size of one-loop corrections to $b\ensuremath{\rightarrow}s\ensuremath{\gamma}$, the weak-isospin violating parameter $\ensuremath{\alpha}T$ and the decay $Z\ensuremath{\rightarrow}b\overline{b}$. We find that the new fermiophobic vector states (the analogs of the gauge-boson Kaluza-Klein modes in a continuum model) can be reasonably light, with a mass as low as 380 GeV, while the extra (approximately vectorial) quark and lepton states (the analogs of the fermion Kaluza-Klein modes) must be heavier than 1.8 TeV.