Viability of Dirac phase leptogenesis
Viability of Dirac phase leptogenesis
We discuss the conditions for a non-vanishing Dirac phase ? and mixing angle ?13, sources of CP violation in neutrino oscillations, to be uniquely responsible for the observed matter–antimatter asymmetry of the Universe through leptogenesis. We show that this scenario, that we call ?-leptogenesis, is viable when the degenerate limit for the heavy right-handed (RH) neutrino spectrum is considered.
We derive an interesting joint condition on sin?13 and the absolute neutrino mass scale that can be tested in future neutrino oscillation experiments. In the limit of the hierarchical heavy RH neutrino spectrum, we strengthen the previous result that ?-leptogenesis is only very marginally allowed, even when the production from the two heavier RH neutrinos is taken into account. An improved experimental upper bound on sin?13 and/or an account of quantum kinetic effects could completely rule out this option in the future.
Therefore, ?-leptogenesis can be also regarded as motivation for models with degenerate heavy neutrino spectrum.
cosmological neutrinos, physics of the early universe, baryon asymmetry
1-34
Anisimov, Alexey
553bc69d-8d93-4ade-b51c-244d0c3c502b
Blanchet, Steve
3dfe916f-3116-4bfc-935f-dd8de64820f9
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
24 April 2008
Anisimov, Alexey
553bc69d-8d93-4ade-b51c-244d0c3c502b
Blanchet, Steve
3dfe916f-3116-4bfc-935f-dd8de64820f9
Di Bari, Pasquale
3fe21e59-0eff-41bc-8faa-fdd817146418
Anisimov, Alexey, Blanchet, Steve and Di Bari, Pasquale
(2008)
Viability of Dirac phase leptogenesis.
Journal of Cosmology and Astroparticle Physics, 2008 (4), .
(doi:10.1088/1475-7516/2008/04/033).
Abstract
We discuss the conditions for a non-vanishing Dirac phase ? and mixing angle ?13, sources of CP violation in neutrino oscillations, to be uniquely responsible for the observed matter–antimatter asymmetry of the Universe through leptogenesis. We show that this scenario, that we call ?-leptogenesis, is viable when the degenerate limit for the heavy right-handed (RH) neutrino spectrum is considered.
We derive an interesting joint condition on sin?13 and the absolute neutrino mass scale that can be tested in future neutrino oscillation experiments. In the limit of the hierarchical heavy RH neutrino spectrum, we strengthen the previous result that ?-leptogenesis is only very marginally allowed, even when the production from the two heavier RH neutrinos is taken into account. An improved experimental upper bound on sin?13 and/or an account of quantum kinetic effects could completely rule out this option in the future.
Therefore, ?-leptogenesis can be also regarded as motivation for models with degenerate heavy neutrino spectrum.
Text
Jdiraclep.pdf
- Version of Record
Restricted to Repository staff only
Request a copy
More information
Published date: 24 April 2008
Keywords:
cosmological neutrinos, physics of the early universe, baryon asymmetry
Organisations:
High Energy Physics
Identifiers
Local EPrints ID: 152705
URI: http://eprints.soton.ac.uk/id/eprint/152705
ISSN: 1475-7516
PURE UUID: 0a43eb49-9cdb-46c9-b707-248302cd25ce
Catalogue record
Date deposited: 17 May 2010 08:25
Last modified: 14 Mar 2024 01:24
Export record
Altmetrics
Contributors
Author:
Alexey Anisimov
Author:
Steve Blanchet
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics