From weak-scale observables to leptogenesis

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 $T_{RH}\sim 10^9$ GeV. The low-energy observable consequences of this scenario are $BR(\tau \to \ell \gamma )\sim 10^{-8}-10^{-9}$. 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.

a few references added

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Cited by in corpus (45)

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• Neutrino Phenomenology -- the case of two right handed neutrinos
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• Flavour-Dependent Leptogenesis with Sequential Dominance
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• SUSEFLAV: program for supersymmetric mass spectra with seesaw mechanism and rare lepton flavor violating decays
• Leptogenesis in SO(10)
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• Patterns of Lepton-Flavour Violation Motivated by Decoupling and Sneutrino Inflation
• Lepton Flavor Violation, Neutralino Dark Matter and the Reach of the LHC
• Scenarios of modulated perturbations
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• Neutrino Data, CP violation and Cosmological Implications
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