Code repository for the paper Dirac neutrino mass generation from Majorana messenger by Julian Calle, Diego Restrepo, Óscar Zapata.
The radiative type-I seesaw has been already implemented to explain the lightness of Majorana neutrinos with both Majorana and Dirac heavy fermions, and the lightness of Dirac neutrinos with Dirac heavy fermions. In this work we present a minimal implementation of the radiative type-I seesaw with light Dirac neutrinos and heavy Majorana fermions. An inert doublet and a complex singlet scalar complete the dark sector which is protected by an Abelian fermiophobic gauge symmetry that also forbids tree level mass contributions for the full set of light neutrinos. A fermion vector-like extension of the model is also proposed where the light right-handed neutrinos can thermalize in the primordial plasma and the extra gauge boson can be directly produced at colliders. In particular, the current upper bound on ΔNeff reported by PLANCK points to large ratios MZ'/g'≳ 40 TeV which can be competitive with collider constraint for g' sufficiently large in the ballpark of the Standard Model values, while future cosmic microwave background experiments may probe all the no minimal models presented here.
- D_Neff.pdf Contribution to the number of extra relativistic degrees of freedom (ΔNeff) in function of MZ'/g'.
The dependencies are just the standard Python Scipy tools with numpy, matplotlib and pandas
The code is contained inside the Jupyter notebook
There is also the Mathematica notebook with the anomaly cancellation analysis
If you use this code, please cite our paper BibTeX
Based in template for https://github.com/smsharma/mining-for-substructure-lens