论文标题
限制双线左右对称模型的尺度和标量扇区
Constraining the gauge and scalar sectors of the doublet left-right symmetric model
论文作者
论文摘要
我们考虑标准模型的左右对称扩展，其中左右对称性的自发分解是由双重触发的。与Triplet Case相反，Electroweak $ρ$参数可保护该双重左右模型（DLRM）中的大型校正。这原则上允许对称破坏的更多样化的模式。我们考虑了DLRM的量规和标量扇区的几个限制：涉及具有纵向极化的仪表玻色子的散射过程的单位性，对MUON $ΔR$参数的辐射校正以及在$ z $ POL和低能的电气型观测值的辐射校正。 Combining these constraints within the frequentist CKMfitter approach, we see that the fit pushes the scale of left-right symmetry breaking up to a few TeV, while favouring an electroweak symmetry breaking triggered not only by the $ SU(2)_L \times SU(2)_R $ bi-doublet, which is the case most commonly considered in the literature, but also by the $ SU(2)_L $ doublet.
We consider a left-right symmetric extension of the Standard Model where the spontaneous breakdown of the left-right symmetry is triggered by doublets. The electroweak $ρ$ parameter is protected from large corrections in this Doublet Left-Right Model (DLRM), contrary to the triplet case. This allows in principle for more diverse patterns of symmetry breaking. We consider several constraints on the gauge and scalar sectors of DLRM: the unitarity of scattering processes involving gauge bosons with longitudinal polarisations, the radiative corrections to the muon $Δr$ parameter and the electroweak precision observables measured at the $Z$ pole and at low energies. Combining these constraints within the frequentist CKMfitter approach, we see that the fit pushes the scale of left-right symmetry breaking up to a few TeV, while favouring an electroweak symmetry breaking triggered not only by the $ SU(2)_L \times SU(2)_R $ bi-doublet, which is the case most commonly considered in the literature, but also by the $ SU(2)_L $ doublet.
