arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0709.1898hep-ph
收藏

无Higgsless模型中的谱、三次和四次规范耦合

Spectra, triple and quartic gauge couplings in a Higgsless model

Kingman Cheung, Xiao-Hong Wu, Qi-Shu Yan

摘要:

用数值方法研究了翘曲空间中规范群为$SU(2)_L\times SU(2)_R\times U(1)_{B-L}$的无Higgsless模型的谱、三次和四次规范耦合。我们将多规范玻色子顶点的运动方程、边界条件和形式推广到Hirn-Sanz情形。在理想离域费米子剖面的假设下,我们研究了矢量玻色子的能谱以及矢量玻色子之间的三次和四次规范耦合。结果表明,量子色动力学功率修正参数对质量谱有很大的修正作用。同时,三次和四次规范耦合可以偏离标准模型的值到至少$\pm 10%$,并且可以饱和LEP 2边界。我们发现$Z{\bar W}W$的三重规范耦合可以小于$ 50 %$的幺正性边界。而${\bar Z}WW$的三重规范耦合比幺正性边界小20%,这可能对$m_{\bar Z}> 500$ GeV的LHC通过s通道探测${\bar Z}$提出挑战。

英文摘要:

Spectra, triple and quartic gauge couplings of the Higgsless model with gauge group $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ defined in warped space are explored with numerical method. We extend the equation of motions, boundary conditions and formalism of multi-gauge-boson vertices to the Hirn-Sanz scenario. By assuming the ideally delocalized fermion profile, we study the spectra of vector bosons as well as the triple and quartic gauge couplings among vector bosons. It is found that mass spectra can be greatly modified by the parameters of QCD power corrections. Meanwhile, the triple and quartic gauge couplings can deviate from the values of the standard model to at least $\pm 10%$ and can saturate the LEP2 bounds. We find the triple gauge couplings of $Z{\bar W}W$ can be $ 50 %$ smaller than the unitarity bounds. While the triple gauge couplings of ${\bar Z}WW$ is 20% smaller than the unitarity bounds, which might challenge the detection of ${\bar Z}$ via s channel at LHC if $m_{\bar Z}> 500$ GeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑