Consequences of Triplet Seesaw for Leptogenesis

By T. Hambye, Goran Senjanovic. 2003

162 citations recorded by the source corpus.

Abstract We present the various leptogenesis scenarios which may occur if, in addition to the ordinary heavy right-handed neutrinos, there exists a heavy scalar SU(2)L triplet coupled to leptons. We show that the contributions of the right-handed neutrinos and the triplet to the lepton asymmetry are proportional to their respective contributions to the neutrino mass matrix. A consequence of the triplet contribution to the lepton asymmetry is that there is no more upper bound on the neutrino masses from leptogenesis due to the fact that the neutrino mass constraints do not necessarily induce asymmetry washout effects. We also show how such a triplet leptogenesis mechanism may emerge naturally in the framework of the left–right symmetric theories, such as Pati–Salam or SO(10).

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3e4766d5306203cab86934b5535c85424969fc92

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In Nuclear and High Energy Physics

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Citations in the corpus

• Flavor structures of charged fermions and massive neutrinos (2019, unknown): “6(b) can be replaced by ∆) [942, 943, 944].”
• Leptogenesis as a common origin for matter and dark matter (2009, background): “However, in the latter case, the triplet Higgs contribution dominates the leptogenesis in the dark sector [ 60 , 61] which will ruin the relation nB = nB′.”
• Baryogenesis from the weak scale to the grand unification scale (2020, methodology): “In type-II models, where a triplet contribution appears in the neutrino mass matrix as in left-right symmetric models, the direct connection between neutrino masses and leptogenesis is lost (Hambye and Senjanovic, 2004; Antusch and King, 2004).”
• Type II leptogenesis and the neutrino mass scale (2004, background): “In particular, we confirm the correction by the factor −3/2 compared to the previous result of [8] in the SM.”
• A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, methodology): “[643, 653]), type II [370, 654, 655], and type III [656, 657] seesaws, mostly using Boltzmann Equations as pioneered by [658].”
• Leptogenesis (2008, unknown): “This mechanism necessarily involves lepton number violation, and allows for new CP violating phases so we should examine it as a possible source of leptogenesis [162,270, 282].”