The Minimal Supersymmetric Leptogenesis

TL;DR

This paper revisits a minimal supersymmetric leptogenesis model, demonstrating it can generate sufficient baryon asymmetry consistent with neutrino oscillation data while avoiding gravitino problems.

Contribution

It provides a detailed analysis showing that a minimal supersymmetric leptogenesis model can produce the observed baryon asymmetry without introducing new physics beyond supersymmetry and Majorana neutrinos.

Findings

Baryon asymmetry can be generated with the model.

Reheating temperature can be low enough to avoid gravitino problems.

Model aligns with atmospheric and solar neutrino data.

Abstract

We reanalyze the supersymmetric leptogenesis model by one of the authors (HM) and Yanagida based on \tilde{L} = H_u flat direction in detail. We point out that the appropriate amount of baryon asymmetry can be generated in this model with the neutrino mass matrix consistent with the atmospheric neutrino oscillation and solutions to the solar neutrino problem, preferably the small angle MSW solution. The reheating temperature can be low enough to avoid the cosmological gravitino problem. This model is the minimal one because it does not rely on any new physics beyond supersymmetry and Majorana neutrino masses.