Leptogenesis in the Light of Super-Kamiokande Data and a Realistic String Model

TL;DR

This paper explores how neutrino mass and mixing data from Super-Kamiokande can naturally lead to leptogenesis, using a realistic string-derived flipped SU(5) model that aligns with observed particle masses.

Contribution

It demonstrates a scenario within a string-inspired model where neutrino properties naturally produce the observed baryon asymmetry through leptogenesis.

Findings

Neutrino masses and mixings compatible with Super-Kamiokande data can generate sufficient lepton asymmetry.

The flipped SU(5) model can be configured to produce realistic quark and lepton masses.

A specific neutrino mass scenario supports successful leptogenesis.

Abstract

We discuss leptogenesis in the light of indications of neutrino masses and mixings from Super-Kamiokande and other data on atmospheric neutrinos, as well as the solar neutrino deficit. Neutrino masses and mixings consistent with these data may produce in a natural and generic way a lepton asymmetry that is suffient to provide the observed baryon asymmetry, after processing via non-perturbative electroweak effects. We illustrate this discussion in the framework of the string-derived flipped SU(5) model, using particle assignments and choices of vacuum parameters that are known to give realistic masses to quarks and charged leptons. We display one scenario for neutrino masses that also accommodates leptogenesis.