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Title: Analysis of leptogenesis in a supersymmetric triplet seesaw model

Abstract

We analyze leptogenesis in a supersymmetric triplet seesaw scenario that explains the observed neutrino masses, adopting a phenomenological approach where the decay branching ratios of the triplets and the amount of CP violation in its different decay channels are assumed as free parameters. We find that the solutions of the relevant Boltzmann equations lead to a rich phenomenology, in particular, much more complex compared to the nonsupersymmetric case, mainly due to the presence of an additional Higgs doublet. Several unexpected and counter-intuitive behaviors emerge from our analysis: the amount of CP violation in one of the decay channels can prove to be irrelevant to the final lepton asymmetry, leading to successful leptogenesis even in scenarios with a vanishing CP violation in the leptonic sector; gauge annihilations can be the dominant effect in the determination of the evolution of the triplet density up to very high values of its mass, leading anyway to a sizeable final lepton asymmetry, which is also a growing function of the washout parameter K{identical_to}{gamma}{sub d}/H, defined as usual as the ratio between the triplet decay amplitude {gamma}{sub d} and the Hubble constant H; on the other hand, cancellations in the Boltzmann equations may lead to amore » vanishing lepton asymmetry if in one of the decay channels both the branching ratio and the amount of CP violation are suppressed, but not vanishing. The present analysis suggests that in the supersymmetric triplet seesaw model successful leptogenesis can be attained in a wide range of scenarios, provided that an asymmetry in the decaying triplets can act as a lepton-number reservoir.« less

Authors:
 [1];  [1]
  1. Korea Institute for Advanced Study, Seoul 130-722 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20933270
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevD.75.023508; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANNIHILATION; ASYMMETRY; BOLTZMANN EQUATION; BRANCHING RATIO; CP INVARIANCE; DECAY AMPLITUDES; HIGGS BOSONS; HIGGS MODEL; LEPTON NUMBER; MASS; MATHEMATICAL SOLUTIONS; NEUTRINOS; PARTICLE DECAY; SUPERSYMMETRY

Citation Formats

Chun, Eung Jin, MCTP, Physics Department, University of Michigan, Ann Arbor, Michigan 48109, and Scopel, Stefano. Analysis of leptogenesis in a supersymmetric triplet seesaw model. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.023508.
Chun, Eung Jin, MCTP, Physics Department, University of Michigan, Ann Arbor, Michigan 48109, & Scopel, Stefano. Analysis of leptogenesis in a supersymmetric triplet seesaw model. United States. doi:10.1103/PHYSREVD.75.023508.
Chun, Eung Jin, MCTP, Physics Department, University of Michigan, Ann Arbor, Michigan 48109, and Scopel, Stefano. Mon . "Analysis of leptogenesis in a supersymmetric triplet seesaw model". United States. doi:10.1103/PHYSREVD.75.023508.
@article{osti_20933270,
title = {Analysis of leptogenesis in a supersymmetric triplet seesaw model},
author = {Chun, Eung Jin and MCTP, Physics Department, University of Michigan, Ann Arbor, Michigan 48109 and Scopel, Stefano},
abstractNote = {We analyze leptogenesis in a supersymmetric triplet seesaw scenario that explains the observed neutrino masses, adopting a phenomenological approach where the decay branching ratios of the triplets and the amount of CP violation in its different decay channels are assumed as free parameters. We find that the solutions of the relevant Boltzmann equations lead to a rich phenomenology, in particular, much more complex compared to the nonsupersymmetric case, mainly due to the presence of an additional Higgs doublet. Several unexpected and counter-intuitive behaviors emerge from our analysis: the amount of CP violation in one of the decay channels can prove to be irrelevant to the final lepton asymmetry, leading to successful leptogenesis even in scenarios with a vanishing CP violation in the leptonic sector; gauge annihilations can be the dominant effect in the determination of the evolution of the triplet density up to very high values of its mass, leading anyway to a sizeable final lepton asymmetry, which is also a growing function of the washout parameter K{identical_to}{gamma}{sub d}/H, defined as usual as the ratio between the triplet decay amplitude {gamma}{sub d} and the Hubble constant H; on the other hand, cancellations in the Boltzmann equations may lead to a vanishing lepton asymmetry if in one of the decay channels both the branching ratio and the amount of CP violation are suppressed, but not vanishing. The present analysis suggests that in the supersymmetric triplet seesaw model successful leptogenesis can be attained in a wide range of scenarios, provided that an asymmetry in the decaying triplets can act as a lepton-number reservoir.},
doi = {10.1103/PHYSREVD.75.023508},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 2,
volume = 75,
place = {United States},
year = {2007},
month = {1}
}