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On leptogenesis, flavour effects and the low energy neutrino parameters

On leptogenesis, flavour effects and the low energy neutrino parameters
On leptogenesis, flavour effects and the low energy neutrino parameters
Contemporary physics is testing the boundaries of one of its existent paradigms, the Standard Model of Particle Physics. In recent years many attempts have been made in order to overcome the difficulties arising within this well known framework. Along with the effort made on the experimental side, for example the search for the Higgs boson at the Large Hadron Collider, there is a present requirement for testable theoretical scenarios describing physics beyond the current paradigms. To this purpose we consider the type I Seesaw extension of the Standard Model, in which the neutrino mass puzzle is possibly solved and the baryon asymmetry of the Universe explained via Leptogenesis. After reviewing the basis of the Seesaw mechanism and its recent developments we present a rigorous investigation which confirms the validity of the adopted description. Encouraged by this success we then employ the interplay of light and heavy neutrino flavour effects to address the problem of initial conditions in Leptogenesis. Our analysis identifies the tau N2-dominated scenario as the only possible answer, proposing a well defined setup in which successful strong thermal Leptogenesis is achieved. Attracted by the properties of our solution we consequently investigate its compatibility with the SO(10)-inspired model of Leptogenesis. The result is indeed intriguing: the strong thermal solutions of the SO(10)-inspired model deliver sharp predictions on the lowenergy neutrino parameters that fall within the reach of future neutrino experiments,opening up the possibility of a full test of this attractive Leptogenesis scenario.
Marzola, Luca
53d3bd4b-b60a-46d9-a3dd-96d0bb305bff
Marzola, Luca
53d3bd4b-b60a-46d9-a3dd-96d0bb305bff
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418

(2012) On leptogenesis, flavour effects and the low energy neutrino parameters. University of Southampton, Faculty of Physical and Applied Sciences, Doctoral Thesis, 166pp.

Record type: Thesis (Doctoral)

Abstract

Contemporary physics is testing the boundaries of one of its existent paradigms, the Standard Model of Particle Physics. In recent years many attempts have been made in order to overcome the difficulties arising within this well known framework. Along with the effort made on the experimental side, for example the search for the Higgs boson at the Large Hadron Collider, there is a present requirement for testable theoretical scenarios describing physics beyond the current paradigms. To this purpose we consider the type I Seesaw extension of the Standard Model, in which the neutrino mass puzzle is possibly solved and the baryon asymmetry of the Universe explained via Leptogenesis. After reviewing the basis of the Seesaw mechanism and its recent developments we present a rigorous investigation which confirms the validity of the adopted description. Encouraged by this success we then employ the interplay of light and heavy neutrino flavour effects to address the problem of initial conditions in Leptogenesis. Our analysis identifies the tau N2-dominated scenario as the only possible answer, proposing a well defined setup in which successful strong thermal Leptogenesis is achieved. Attracted by the properties of our solution we consequently investigate its compatibility with the SO(10)-inspired model of Leptogenesis. The result is indeed intriguing: the strong thermal solutions of the SO(10)-inspired model deliver sharp predictions on the lowenergy neutrino parameters that fall within the reach of future neutrino experiments,opening up the possibility of a full test of this attractive Leptogenesis scenario.

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Published date: 13 November 2012
Organisations: University of Southampton, Theoretical Partical Physics Group

Identifiers

Local EPrints ID: 346819
URI: http://eprints.soton.ac.uk/id/eprint/346819
PURE UUID: 4be155ce-2864-4552-8691-eb3a9f96cf9d

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Date deposited: 01 Jul 2013 14:19
Last modified: 18 Jul 2017 05:01

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Contributors

Author: Luca Marzola
Thesis advisor: Pasquale Di Bari

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