Abstract
We study the implications of thermal leptogenesis for neutrino parameters. Assuming that decays of N 1, the lightest of the heavy Majorana neutrinos, initiate baryogenesis, we show that the final baryon asymmetry is determined by only four parameters: the CP asymmetry ε 1, the heavy neutrino mass M 1, the effective light neutrino mass m 1 , and the quadratic mean m of the light neutrino masses. Imposing the CMB measurement of the baryon asymmetry as constraint on the neutrino parameters, we show, in a model independent way, that quasi-degenerate neutrinos are incompatible with thermal leptogenesis. For maximal CP asymmetry ε 1, and neutrino masses in the range from ( Δm 2 sol) 1/2 to ( Δm 2 atm) 1/2, the baryogenesis temperature is T B= O(10 10) GeV.
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