Leptogenesis with triplet scalars at electroweak scale

TL;DR

This paper explores a novel leptogenesis mechanism using triplet scalars at the electroweak scale within an extended Georgi-Machacek model, linking baryon asymmetry generation to potential collider signatures at the LHC.

Contribution

It introduces a modified Georgi-Machacek scenario enabling leptogenesis with triplet VEVs that influence electroweak symmetry breaking, accessible at TeV-scale collider experiments.

Findings

Leptogenesis can occur with triplet scalars at the electroweak scale.

Triplet VEVs in the model affect electroweak symmetry breaking.

Potential LHC signatures can probe the triplet scalars responsible for leptogenesis.

Abstract

Up until now the works regarding leptogenesis have discussed different mechanisms to explain the observed baryon asymmetry of the universe (BAU). The type-$II$ seesaw mechanism employing triplet scalars has been well studied in this context and the triplet vacuum expectation value (VEV) answering to the observed BAU is $(< 10^{-2} ~ GeV)$. On the contrary we are invoking an extended Georgi-Machacek type scenario, capable of generating BAU through leptogenesis while keeping the triplet VEV at a moderate range where it plays a nontrivial role in electroweak symmetry breaking (EWSB). In this study we have also considered the decaying scalar mass responsible for leptogenesis to be within a TeV and hence one can probe this possibility at the Large Hadron Collider (LHC) itself via different kinds of signature corresponding to different triplet VEV region.