论文标题
降低pati-salam的规模，突破seesaw混合
Lowering the scale of Pati-Salam breaking through seesaw mixing
论文作者
论文摘要
我们分析了标准模型的Pati-Salam扩展的破裂量表上的实验限制。这些来自模型中矢量leptoquark在树级介导的稀有膜衰减过程的实验限制。通常，这种leptoquark与左手和右手的sm fermions都伴侣，因此，介子衰变并没有抑制螺旋性。我们发现，当前限制从$ \ Mathcal {O}（80-2500）$ TEV不等，具体取决于相关的三代充电交互中出现的矩阵结构的选择。我们广泛地分析了引入其他典型自由度的场景，以完整的pati-salam多重体转换。这些可以降低Pati-salam的尺度，通过带电的莱普顿和夸克部门中的质量混合，从而导致对介子衰变宽度的螺旋抑制，从而限制了pati-salam的破裂。为此，我们发现四个具有不同程度的生存力的多重组：$ su（2）_ {l/r/r} $ bidoublet，一对$ su（4）$ decupletets和$ su（2）_l $或$ su（2）_l $或$ su（2）_r $ $ $ $ su（2）_r $ $ treblet所有其中包含sm smed offed lepted lepts lepts lepts的沉重的Exotic版本。我们发现，Pati-salam限制可以低至$ \ MATHCAL {O}（5-150）$ TEV，并加上这四个多重组。我们还确定了中微子质量的较小程度与四个多重多组中三个pati-salam限制的螺旋抑制之间的一种有趣的可能联系。
We analyse the experimental limits on the breaking scale of Pati-Salam extensions of the Standard Model. These arise from the experimental limits on rare-meson decay processes mediated at tree-level by the vector leptoquark in the model. This leptoquark ordinarily couples to to both left- and right-handed SM fermions and therefore the meson decays do not experience a helicity suppression. We find that the current limits vary from $\mathcal{O}(80-2500)$ TeV depending on the choice of matrix structure appearing in the relevant three-generational charged-current interactions. We extensively analyse scenarios where additional fermionic degrees of freedom are introduced, transforming as complete Pati-Salam multiplets. These can lower the scales of Pati-Salam breaking through mass-mixing within the charged-lepton and down-quark sectors, leading to a helicity suppression of the meson decay widths which constrain Pati-Salam breaking. We find four multiplets with varying degrees of viability for this purpose: an $SU(2)_{L/R}$ bidoublet, a pair of $SU(4)$ decuplets and either a $SU(2)_L$ or $SU(2)_R$ triplet all of which contain heavy exotic versions of the SM charged leptons. We find that the Pati-Salam limits can be as low as $\mathcal{O}(5-150)$ TeV with the addition of these four multiplets. We also identify an interesting possible connection between the smallness of the neutrino masses and a helicity suppression of the Pati-Salam limits for three of the four multiplets.
