科研之友
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摘要
We extend the results of a previous analysis of ours showing that, when both heavy and light flavour effects are taken into account, successful minimal (type I + thermal) leptogenesis with SO(10)-inspired relations is possible. Barring fine tuned choices of the parameters, these relations enforce a hierarchical RH neutrino mass spectrum that results into a final asymmetry dominantly produced by the next-to-lightest RH neutrino decays (N-2 dominated leptogenesis). We present the constraints on the whole set of low energy neutrino parameters. Allowing a small misalignment between the Dirac basis and the charged lepton basis as in the quark sector, the allowed regions enlarge and the lower bound on the reheating temperature gets relaxed to values as low as similar to 10(10) GeV. It is confirmed that for normal ordering (NO) there are two allowed ranges of values for the lightest neutrino mass: m(1) similar or equal to (1 - 5) x 10(-3) eV and m(1) similar or equal to (0.03 - 0.1) eV. For m(1) less than or similar to 0.01 eV the allowed region in the plane theta(13)-theta(23) is approximately given by theta(23) less than or similar to 49 degrees + 0.65(theta(13) -5 degrees), while the neutrinoless double beta decay effective neutrino mass falls in the range m(ee) = (1 - 3) x 10(-3) eV for theta(13) = (6 degrees - 11.5 degrees). For m(1) greater than or similar to 0.01 eV, one has quite sharply m(ee) similar or equal to m(1) and an upper bound theta(23) less than or similar to 46 degrees. These constraints will be tested by low energy neutrino experiments during next years. We also find that inverted ordering (IO), though quite strongly constrained, is not completely ruled out. In particular, we find approximately theta(23) similar or equal to 43 degrees + 12 degrees log(0.2 eV/m(1)), that will be fully tested by future experiments.
- 出版日期2011-4
