The 750 GeV di-photon LHC excess and extra <i>Z</i>'s in heterotic-string derived models

Faraggi, Alon E ORCID: 0000-0001-7123-6414 and Rizos, John (2016) The 750 GeV di-photon LHC excess and extra <i>Z</i>'s in heterotic-string derived models. EUROPEAN PHYSICAL JOURNAL C, 76 (3). 170-.

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Abstract

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.

Item Type:	Article
Additional Information:	17 pages. 1 figure. Minor revisions. References added. Published version
Uncontrolled Keywords:	hep-ph, hep-ph, hep-th
Depositing User:	Symplectic Admin
Date Deposited:	03 Mar 2017 09:13
Last Modified:	15 Mar 2024 01:22
DOI:	10.1140/epjc/s10052-016-4026-8
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3006183