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N_2-dominated leptogenesis

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In my talk I will discuss a scenario of minimal leptogenesis (thermal + type I seesaw mechanism) that is interesting because potentially testable in future low energy neutrino experiments. In the last years it become clear that a reliable calculation of the final asymmetry in leptogenesis has in general to take into account the contribution produced from the heavier RH neutrino decays. In particular the contribution from the next-to-lightest RH neutrinos (the “N_2” neutrinos) decays can be the dominant source when the RH neutrino mass spectrum exhibits a strong hierarchy and the lightest RH neutrino N_1 is sufficiently light to give a negligible contribution to the final asymmetry. Interestingly, this scenario can be motivated within grand unified theories. In this case further restrictions can be imposed on the seesaw parameters such that the final asymmetry can be expressed in terms just of the low energy neutrino parameters. Furthermore, imposing successful leptogenesis can potentially yield predictions on the low energy neutrino parameters. I will also show how recently studied effects, flavour coupling and phantom leptogenesis, can also remarkably influence the final result and have therefore to be taken into account.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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