Triplet leptogenesis in left-right symmetric seesaw models

Journal Article · Tue Jan 15 04:00:00 EST 2008 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2008/01/014· OSTI ID:22137759

Haellgren, Tomas; Konstandin, Thomas; Ohlsson, Tommy ^[1]

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1. Department of Theoretical Physics, Royal Institute of Technology (KTH), AlbaNova University Center, Roslagstullsbacken 21, 106 91, Stockholm (Sweden)

We discuss scalar triplet leptogenesis in a specific left-right symmetric seesaw model. We show that the Majorana phases that are present in the model can be effectively used to saturate the existing upper limit on the CP-asymmetry of the triplets. We solve the relevant Boltzmann equations and analyze the viability of triplet leptogenesis. It is known for this kind of scenario that the efficiency of leptogenesis is maximal if there exists a hierarchy between the branching ratios of the triplet decays into leptons and Higgs particles. We show that triplet leptogenesis typically favors branching ratios with not too strong hierarchies, since maximal efficiency can only be obtained at the expense of suppressed CP-asymmetries.

• OSTI ID: 22137759
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2008; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BOLTZMANN EQUATION
BRANCHING RATIO
HIGGS BOSONS
LEPTONS
PARTICLE DECAY
PARTICLE PRODUCTION
SCALARS