Leptogenesis with triplet scalars at electroweak scale

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.