On Electroweak Phase Transition and Di-photon Excess with a 750 GeV Scalar Resonance

TL;DR

This paper explores how additional scalar particles in beyond Standard Model theories can enable a strong first order electroweak phase transition, potentially explaining the 750 GeV diphoton excess observed at the LHC.

Contribution

It investigates various scalar models to connect electroweak baryogenesis with the 750 GeV diphoton resonance, proposing a unified explanation within BSM frameworks.

Findings

Certain scalar models can produce a strong first order phase transition.

Some models can account for the 750 GeV diphoton excess.

The study identifies viable parameter spaces linking baryogenesis and collider signals.

Abstract

For successful electroweak baryogenesis to take place through the sphaleron process the universe needs to undergo a strong first order cosmological phase transition. While it does not occur in the Standard Model it becomes possible in the presence of extra scalars in BSM. One of these scalars can well be responsible for the recently observed diphoton excess in the CMS and ATLAS experiments in LHC. We study the Electroweak phase transition in a myriad of scalar models in this context.