A Flippon Related Singlet at the LHC II

TL;DR

This paper explores a supersymmetric GUT model with vector-like particles to explain the 750 GeV diphoton resonance observed at the LHC, demonstrating compatibility with experimental data and proposing benchmark scenarios.

Contribution

It introduces a model with a Standard Model singlet coupling to vector-like particles, explaining the diphoton resonance with realistic parameters and analyzing experimental viability.

Findings

The model can reproduce observed diphoton cross-sections at 8 TeV and 13 TeV.

Light vector-like particles are consistent with current experimental constraints.

Benchmark scenarios satisfy LHC and other experimental bounds.

Abstract

We consider the 750 GeV diphoton resonance at the 13 TeV LHC in the ${\cal F}$-$SU(5)$ model with a Standard Model (SM) singlet field which couples to TeV-scale vector-like particles, dubbed $flippons$. This singlet field assumes the role of the 750 GeV resonance, with production via gluon fusion and subsequent decay to a diphoton via the vector-like particle loops. We present a numerical analysis showing that the observed 8 TeV and 13 TeV diphoton production cross-sections can be generated in the model space with realistic electric charges and Yukawa couplings for light vector-like masses. We further discuss the experimental viability of light vector-like masses in a General No-Scale ${\cal F}$-$SU(5)$ model, offering a few benchmark scenarios in this consistent GUT that can satisfy all experimental constraints imposed by the LHC and other essential experiments.