From weak-scale observables to leptogenesis

2003/02/20 by Sacha Davidson
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Asymmetry #Baryon asymmetry #Gravitino #Leptogenesis #Lepton #Neutrino #Neutrino Physics Research #Nuclear physics #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Seesaw molecular geometry #Supersymmetry #Yukawa potential #hep-ph

paper · pdf · doi:10.1088/1126-6708/2003/03/037

published as JHEP 0303:037,2003 · a few references added

arxiv created 2003/02/20 · openalex publication_date 2003/03/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Thermal leptogenesis is an attractive mechanism for generating the baryon asymmetry of the Universe. However, in supersymmetric models, the parameter space is severely restricted by the gravitino bound on the reheat temperature T_RH. For hierarchical light neutrino masses, it is shown that thermal leptogenesis \it can work when T_RH ∼ 10⁹ GeV. The low-energy observable consequences of this scenario are BR(τ→ ℓ γ) ∼ 10^-8 - 10^-9 . For higher T_RH, thermal leptogenesis works in a larger area of parameter space, whose observable consequences are more ambiguous. A parametrisation of the seesaw in terms of weak-scale inputs is used, so the results are independent of the texture chosen for the GUT-scale Yukawa matrices.

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