The Observed Diphoton Excess in F-theory Inspired Heterotic String-Derived Model

TL;DR

This paper explores a string-inspired GUT model from F-theory that could explain the LHC's diphoton excess through heavy vector-like particles and specific symmetry breaking mechanisms.

Contribution

It presents a novel flipped SO(10) model embedded in E6 GUT with a unique arrangement of Standard Model representations within the 27-dimensional E6 representation.

Findings

Proposes a string-inspired GUT framework for diphoton excess

Analyzes the role of heavy vector-like particles in decay processes

Reviews previous models and introduces a new accommodation of SM in E6

Abstract

The production and the subsequent decay of the SM singlet via heavy vector--like colour triplets and electroweak doublets in one--loop diagrams can shed light on the recent observation of diphoton excess at the LHC. In this paper, the $E_6$ GUT is considered in the F-theory setting where the $E_6$ is broken by making use of the spectral cover construction and by turning on the hypercharge gauge flux. This paper is based on the results presented in \cite{Athanasopoulos:2014bba, Faraggi:2016xnm, Ashfaque:2016jha} which will be reviewed briefly. Here, by following the F-theory approach, akin to \cite{Karozas:2016hcp, Leontaris:2016wsy, Das:2016xuc}, we present a study of the flipped $SO(10)$ model embedded completely in the $E_{6}$ GUT but with a different accommodation of the SM representations in the ${\bf{27}}$ of $E_{6}$.