Renormalization group evolution of neutrino masses and mixing in the Type-III seesaw mechanism

Chakrabortty, Joydeep ; Dighe, Amol ; Goswami, Srubabati ; Ray, Shamayita (2009) Renormalization group evolution of neutrino masses and mixing in the Type-III seesaw mechanism Nuclear Physics B, 820 (1-2). pp. 116-147. ISSN 0550-3213

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.nuclphysb.2009.05.016

Abstract

We consider the standard model extended by heavy right-handed fermions transforming as triplets under SU(2)LSU(2)L, which generate neutrino masses through the Type-III seesaw mechanism. At energies below their respective mass scales, the heavy fields get sequentially decoupled to give an effective dimension-5 operator. Above their mass thresholds, these fields also participate in the renormalization of the wavefunctions, masses and coupling constants. We compute the renormalization group evolution of the effective neutrino mass matrix in this model, with particular emphasis on the threshold effects. The evolution equations are obtained in a basis of neutrino parameters where all the quantities are well-defined everywhere, including at θ13=0. We also point out the important role of the threshold effects and Majorana phases in the evolution of mixing angles through illustrative examples.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Renormalization Group Evolution; Type-III Seesaw; Triplet Fermion; Neutrino Masses and Mixing
ID Code:101501
Deposited On:09 Mar 2018 10:25
Last Modified:09 Mar 2018 10:25

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