11 papers
Addressing the CKM Unitarity Problem with a Vector-like Up Quark
G. C. Branco, J. T. Penedo, Pedro M. F. Pereira +2
We point out that hints of deviations from unitarity in the first row of the CKM matrix may be explained by the presence of a single vector-like top. We study how the stringent exp…
Double Cover of Modular for Flavour Model Building
P. P. Novichkov, J. T. Penedo, S. T. Petcov
We develop the formalism of the finite modular group , a double cover of the modular permutation group , for theories of flavour. The integer weig…
Type-I Seesaw with eV-Scale Neutrinos
G. C. Branco, J. T. Penedo, Pedro M. F. Pereira +2
We consider seesaw type-I models including at least one (mostly-)sterile neutrino with mass at the eV scale. Three distinct situations are found, where the presence of light extra…
Generalised CP Symmetry in Modular-Invariant Models of Flavour
P. P. Novichkov, J. T. Penedo, S. T. Petcov +1
The formalism of combined finite modular and generalised CP (gCP) symmetries for theories of flavour is developed. The corresponding consistency conditions for the two symmetry tra…
Modular Symmetry for Flavour Model Building
P. P. Novichkov, J. T. Penedo, S. T. Petcov +1
In the framework of the modular symmetry approach to lepton flavour, we consider a class of theories where matter superfields transform in representations of the finite modular gro…
Modular Models of Lepton Masses and Mixing
P. P. Novichkov, J. T. Penedo, S. T. Petcov +1
We investigate models of charged lepton and neutrino masses and lepton mixing based on broken modular symmetry. The matter fields in these models are assumed to transform in irredu…