Sommerfeld corrections to type-II and III leptogenesis

TL;DR

This paper investigates how Sommerfeld corrections impact leptogenesis from electroweak triplet decays in type-II and III see-saw models, showing a significant reduction in baryon asymmetry and setting mass constraints beyond LHC reach.

Contribution

It provides the first detailed analysis of Sommerfeld effects on triplet-mediated leptogenesis, quantifying their impact on baryon asymmetry and mass bounds.

Findings

Sommerfeld corrections reduce baryon asymmetry by approximately 30%.

Successful leptogenesis requires triplet masses above 1.6 TeV.

Triplet masses are beyond current LHC discovery capabilities.

Abstract

We study thermal leptogenesis from decays of the electroweak triplets that mediate neutrino masses in type-II and type-III see-saw. We find that Sommerfeld corrections reduce the baryon asymmetry by ~30%, and that successful leptogenesis needs triplets heavier than 1.6 TeV, beyond the discovery reach of LHC.