What question did this study set out to answer?

The research aims to develop a neutrino mass texture that accounts for observed neutrino oscillation data and the CP asymmetry in leptogenesis.

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April 1, 2026Open Access

Neutrino texture saturating the CP asymmetry

Key Points

The research aims to develop a neutrino mass texture that accounts for observed neutrino oscillation data and the CP asymmetry in leptogenesis.
Evaluated a neutrino mass texture in correlation with neutrino oscillation data.
Investigated both thermal and nonthermal leptogenesis scenarios.
Estimated reheating temperature bounds necessary for baryon asymmetry explanation.
Identified a lower reheating temperature bound of O(10^8) GeV for thermal leptogenesis.
Established a lower bound of O(10^6) GeV for nonthermal leptogenesis.
Proposed a specific texture construction to illustrate findings.

Abstract

We study a neutrino mass texture which can explain the neutrino oscillation data and also saturate the upper bound of the CP asymmetry ε1 in the leptogenesis. We consider the thermal and nonthermal leptogenesis based on the right-handed neutrino decay in this model. A lower bound of the reheating temperature required for the explanation of the baryon number asymmetry is estimated as O (10⁸) GeV for the thermal leptogenesis and O (10⁶) GeV for the nonthermal one. It can be lower than the upper bound of the reheating temperature imposed by the cosmological gravitino problem. An example of the construction of the discussed texture is also presented. © 2005 The American Physical Society.

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