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SO(10)-inspired solution to the problem of the initial conditions in leptogenesis

SO(10)-inspired solution to the problem of the initial conditions in leptogenesis
SO(10)-inspired solution to the problem of the initial conditions in leptogenesis
We show that, within SO(10)SO(10)-inspired leptogenesis, there exists a solution, with definite constraints on neutrino parameters, able simultaneously to reproduce the observed baryon asymmetry and to satisfy the conditions for the independence of the final asymmetry of the initial conditions (strong thermal leptogenesis). We find that the wash-out of a pre-existing asymmetry as large as O(0.1)O(0.1) requires: (i) reactor mixing angle 2°??13?20°2°??13?20°, in agreement with the experimental result ?13=8°–10°?13=8°–10°; (ii) atmospheric mixing angle 16°??23?41°16°??23?41°, compatible only with current lowest experimentally allowed values; (iii) Dirac phase in the range ??/2????/5??/2????/5, with the bulk of the solutions around ????/5????/5 and such that sign(JCP)=?sign(?B)sign(JCP)=?sign(?B); (iv) neutrino masses mimi normally ordered; (v) lightest neutrino mass in the range m1?15–25 meVm1?15–25 meV, corresponding to ?imi?85–105 meV?imi?85–105 meV; (vi) neutrinoless double beta decay (0???0???) effective neutrino mass mee?0.8m1mee?0.8m1. All together this set of predictive constraints characterises the solution quite distinctively, representing a difficultly forgeable, fully testable, signature. In particular, the predictions mee?0.8m1?15 meVmee?0.8m1?15 meV can be tested by cosmological observations and (ultimately) by 0???0??? experiments. We also discuss different interesting aspects of the solution such as theoretical uncertainties, stability under variation of the involved parameters, forms of the orthogonal and RH neutrino mixing matrices.
0550-3213
719-751
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
Marzola, Luca
53d3bd4b-b60a-46d9-a3dd-96d0bb305bff
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
Marzola, Luca
53d3bd4b-b60a-46d9-a3dd-96d0bb305bff

Di Bari, Pasquale and Marzola, Luca (2013) SO(10)-inspired solution to the problem of the initial conditions in leptogenesis. Nuclear Physics B, 877 (3), 719-751. (doi:10.1016/j.nuclphysb.2013.10.027).

Record type: Article

Abstract

We show that, within SO(10)SO(10)-inspired leptogenesis, there exists a solution, with definite constraints on neutrino parameters, able simultaneously to reproduce the observed baryon asymmetry and to satisfy the conditions for the independence of the final asymmetry of the initial conditions (strong thermal leptogenesis). We find that the wash-out of a pre-existing asymmetry as large as O(0.1)O(0.1) requires: (i) reactor mixing angle 2°??13?20°2°??13?20°, in agreement with the experimental result ?13=8°–10°?13=8°–10°; (ii) atmospheric mixing angle 16°??23?41°16°??23?41°, compatible only with current lowest experimentally allowed values; (iii) Dirac phase in the range ??/2????/5??/2????/5, with the bulk of the solutions around ????/5????/5 and such that sign(JCP)=?sign(?B)sign(JCP)=?sign(?B); (iv) neutrino masses mimi normally ordered; (v) lightest neutrino mass in the range m1?15–25 meVm1?15–25 meV, corresponding to ?imi?85–105 meV?imi?85–105 meV; (vi) neutrinoless double beta decay (0???0???) effective neutrino mass mee?0.8m1mee?0.8m1. All together this set of predictive constraints characterises the solution quite distinctively, representing a difficultly forgeable, fully testable, signature. In particular, the predictions mee?0.8m1?15 meVmee?0.8m1?15 meV can be tested by cosmological observations and (ultimately) by 0???0??? experiments. We also discuss different interesting aspects of the solution such as theoretical uncertainties, stability under variation of the involved parameters, forms of the orthogonal and RH neutrino mixing matrices.

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Published date: 21 December 2013
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 369293
URI: http://eprints.soton.ac.uk/id/eprint/369293
ISSN: 0550-3213
PURE UUID: b355338b-dea5-4caf-80b9-d1a9ec761e51

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Date deposited: 23 Sep 2014 12:35
Last modified: 20 Nov 2021 18:36

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Author: Luca Marzola

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