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arXiv 1601.03604hep-phhep-th
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杂化弦导出模型中的750个GeV双光子LHC过剩和额外Z

The 750 GeV diphoton LHC excess and Extra Z's in Heterotic-String Derived Models

Alon E. Faraggi, John Rizos

摘要:

ATLAS和CMS合作最近记录了可能的双光子过剩在750 GeV和一个不太重要的双玻色子过剩约1.9 TeV。这样的过剩可能产生于由杂弦导出的Z'模型,其中双光子过剩可能与负责Z'对称性破缺的标准模型单线态标量有关,而双玻色子过剩则来自额外矢量玻色子的产生。弦Z'模型中的附加矢量态有助于解释双光子事件的相对较大的宽度,并且通过异常抵消被强制要求在Z'破缺尺度附近。弦模型中非阿贝尔规范对称性的威尔逊线破缺自然地产生了暗物质的候选者。未来的对撞机实验将区分高尺度异质弦模型和低尺度弦模型,前者保留了标准模型数据所指示的微扰统一范式。我们还讨论了高尺度$U(1)_{Z^\prime}$破缺产生双光子事件的可能性。

英文摘要:

The ATLAS and CMS collaborations recently recorded possible di-photon excess at 750 GeV and a less significant di-boson excess around 1.9 TeV. Such excesses may be produced in heterotic-string derived Z' models, where the di-photon excess may be connected with the Standard Model singlet scalar responsible for the Z' symmetry breaking, whereas the di-boson excess arises from production of the extra vector boson. Additional vector-like states in the string Z' model are instrumental to explain the relatively large width of the di-photon events and mandated by anomaly cancellation to be in the vicinity of the Z' breaking scale. Wilson line breaking of the non-Abelian gauge symmetries in the string models naturally gives rise to dark matter candidates. Future collider experiments will discriminate between the high-scale heterotic-string models, which preserve the perturbative unification paradigm indicated by the Standard Model data, versus the low scale string models. We also discuss the possibility for the production of the di-photon events with high scale $U(1)_{Z^\prime}$ breaking.

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