Soft Leptogenesis

We study ``soft leptogenesis'', a new mechanism of leptogenesis which does not require flavour mixing among the right-handed neutrinos. Supersymmetry soft-breaking terms give a small mass splitting between the CP-even and CP-odd right-handed sneutrino states of a single generation and prov...

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Detalles Bibliográficos
Autores principales: D'Ambrosio, Giancarlo, Giudice, Gian F., Raidal, Martti
Lenguaje:eng
Publicado: 2003
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2003.09.037
http://cds.cern.ch/record/633784
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author D'Ambrosio, Giancarlo
Giudice, Gian F.
Raidal, Martti
author_facet D'Ambrosio, Giancarlo
Giudice, Gian F.
Raidal, Martti
author_sort D'Ambrosio, Giancarlo
collection CERN
description We study ``soft leptogenesis'', a new mechanism of leptogenesis which does not require flavour mixing among the right-handed neutrinos. Supersymmetry soft-breaking terms give a small mass splitting between the CP-even and CP-odd right-handed sneutrino states of a single generation and provide a CP-violating phase sufficient to generate a lepton asymmetry. The mechanism is successful if the lepton-violating soft bilinear coupling is unconventionally (but not unnaturally) small. The values of the right-handed neutrino masses predicted by soft leptogenesis can be low enough to evade the cosmological gravitino problem.
id cern-633784
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
record_format invenio
spelling cern-6337842023-03-14T20:04:48Zdoi:10.1016/j.physletb.2003.09.037http://cds.cern.ch/record/633784engD'Ambrosio, GiancarloGiudice, Gian F.Raidal, MarttiSoft LeptogenesisParticle Physics - PhenomenologyWe study ``soft leptogenesis'', a new mechanism of leptogenesis which does not require flavour mixing among the right-handed neutrinos. Supersymmetry soft-breaking terms give a small mass splitting between the CP-even and CP-odd right-handed sneutrino states of a single generation and provide a CP-violating phase sufficient to generate a lepton asymmetry. The mechanism is successful if the lepton-violating soft bilinear coupling is unconventionally (but not unnaturally) small. The values of the right-handed neutrino masses predicted by soft leptogenesis can be low enough to evade the cosmological gravitino problem.We study ``soft leptogenesis'', a new mechanism of leptogenesis which does not require flavour mixing among the right-handed neutrinos. Supersymmetry soft-breaking terms give a small mass splitting between the CP-even and CP-odd right-handed sneutrino states of a single generation and provide a CP-violating phase sufficient to generate a lepton asymmetry. The mechanism is successful if the lepton-violating soft bilinear coupling is unconventionally (but not unnaturally) small. The values of the right-handed neutrino masses predicted by soft leptogenesis can be low enough to evade the cosmological gravitino problem.We study “soft leptogenesis”, a new mechanism of leptogenesis which does not require flavour mixing among the right-handed neutrinos. Supersymmetry soft-breaking terms give a small mass splitting between the CP-even and CP-odd right-handed sneutrino states of a single generation and provide a CP-violating phase sufficient to generate a lepton asymmetry. The mechanism is successful if the lepton-violating soft bilinear coupling is unconventionally (but not unnaturally) small. The values of the right-handed neutrino masses predicted by soft leptogenesis can be low enough to evade the cosmological gravitino problem.hep-ph/0308031CERN-TH-2003-183INFNNA-IV-03-30CERN-TH-2003-183INFNNA-IV-2003-30oai:cds.cern.ch:6337842003-08-04
spellingShingle Particle Physics - Phenomenology
D'Ambrosio, Giancarlo
Giudice, Gian F.
Raidal, Martti
Soft Leptogenesis
title Soft Leptogenesis
title_full Soft Leptogenesis
title_fullStr Soft Leptogenesis
title_full_unstemmed Soft Leptogenesis
title_short Soft Leptogenesis
title_sort soft leptogenesis
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.physletb.2003.09.037
http://cds.cern.ch/record/633784
work_keys_str_mv AT dambrosiogiancarlo softleptogenesis
AT giudicegianf softleptogenesis
AT raidalmartti softleptogenesis

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