We propose here—for the first time in the literature, to our best knowledge—an electroweak unification based on the $SU(5)_{L}\times U(1)_{Y}$ gauge group. The spontaneous symmetry breaking takes place in the manner $SU(5)_{L}\times U(1)_{Y} \rightarrow U(1)_{em}$, due to a particular Higgs sector consisting of five scalar quintuplets. Each scalar quintuplet acquires its own vacuum expectation value, by means of a proper parametrization which is worked out once an overall vacuum expectation value in the model is established. The decoupling of the low-energy regime (corresponding to the Standard Model) from the high scale (required by our model here) is straightforwardly achieved in order to preserve the consistency with the present experimental data. Finally, a promising phenomenological outcome is derived by simply tuning a single free parameter. Our results also include, besides a viable one-parameter mass spectrum, the prediction of precisely three generations in the fermion sector and the electric charge quantization.

中文翻译：

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$SU(5)_{L} \times U(1)_{Y}$ 弱电统一

我们在这里提出——据我们所知，这是文献中的第一次——基于 $SU(5)_{L}\times U(1)_{Y}$ 规范组的弱电统一。由于由五个标量组成的特定希格斯扇区，自发的对称性破缺以 $SU(5)_{L}\times U(1)_{Y}\rightarrow U(1)_{em}$ 的方式发生五胞胎。每个标量五元组通过适当的参数化获得自己的真空期望值，一旦模型中的整体真空期望值被建立，该参数化就会被计算出来。为了保持与当前实验数据的一致性，可以直接实现低能量状态（对应于标准模型）与高尺度（我们的模型在此要求）的解耦。最后，通过简单地调整单个自由参数即可得出有希望的现象学结果。