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arXiv 1706.08372hep-phhep-th
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现象学与F-理论SU(5)

Phenomenology with F-theory SU(5)

George K. Leontaris, Qaisar Shafi

摘要:

我们探讨了基于F理论的SU(5)模型的低能唯象,该模型除了已知的夸克和轻子外,还包含标准模型单线态、矢量色三线态和SU(2)双线态。根据它们的质量和耦合,这些新粒子中的一些可能会在LHC和未来的对撞机上被观察到。我们讨论了CKM约束对它们与三个手征族的普通下夸克混合的限制。该模型与通常的超对称GUT尺度下的规范耦合统一一致,五维质子衰变被充分抑制,而超重规范玻色子介导的六维衰变被增强了5-7倍。第三代带电费米子汤川耦合产生相应的低能质量与观测合理的协议。较轻的世代的质量的层次性质占通过non-renormalisable相互作用,与微扰真空期望值的SM单态场发挥了至关重要的作用。

英文摘要:

We explore the low energy phenomenology of an F-theory based SU(5) model which, in addition to the known quarks and leptons, contains Standard Model singlets, and vector-like color triplets and SU(2) doublets. Depending on their masses and couplings, some of these new particles may be observed at the LHC and future colliders. We discuss the restrictions by CKM constraints on their mixing with the ordinary down quarks of the three chiral familes. The model is consistent with gauge coupling unification at the usual supersymmetric GUT scale, dimension five proton decay is adequately suppressed, while dimension-six decay mediated by the superheavy gauge bosons is enhanced by a factor of 5-7. The third generation charged fermion Yukawa couplings yield the corresponding low-energy masses in reasonable agreement with observations. The hierarchical nature of the masses of lighter generations is accounted for via non-renormalisable interactions, with the perturbative vacuum expectation values of the SM singlet fields playing an essential role.

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