194 citations · 2k across the 66 of their papers we have counts for
66 papers
GOOFy-compatible 3HDMs and beyond
I. de Medeiros Varzielas, A. Kunčinas
Beyond conventional Higgs-family and general CP transformations, one may also consider a broader class of non-standard "GOOFy" transformations, in which the scalar fields and their…
Domain Walls from , and potentials
Gonçalo Barreto, Ivo de Medeiros Varzielas, Ye-Ling Zhou
We consider the degenerate minima arising from scalar potentials invariant under , or under its subgroups and (with or without imposed CP symmetries)…
Residual Symmetries and Scalar Multiplet Vacuum Alignment in Non-Abelian Flavour Models
Ivo de Medeiros Varzielas, Ming-Shau Liu, Amartya Sengupta +1
We demonstrate that, upon minimizing a renormalizable, single-scalar potential invariant under a non-Abelian symmetry, special orientations in the associated vacuum alignment of th…
Predictive linear seesaw model with family symmetry
A. E. Cárcamo Hernández, Ivo de Medeiros Varzielas, Juan Marchant González
We consider a model that accounts for the smallness of neutrino masses through the linear seesaw mechanism and employs a family symmetry to address the flavour problem. The…
A Modular Littlest Seesaw
Ivo de Medeiros Varzielas, Steve F. King, Miguel Levy
We extend the littlest modular seesaw to a Grand Unified scenario based on endowed with three modular symmetries. We leverage symmetry protected zeroes in the leptoni…
Quarks at the modular cusp
I. de Medeiros Varzielas, M. Levy, J. T. Penedo +1
We analyse the possibility of describing quark masses, mixing and CP violation in modular flavour models without flavons. We focus on the case where the closeness of the mod…
Constraining flavoured leptoquarks with LHC and LFV
Ivo de Medeiros Varzielas, Amartya Sengupta
We consider the framework of flavoured leptoquarks, in models with scalar or vector leptoquarks, and look for constraints to the parameter space of these models. Using primarily di…
Littlest Modular Seesaw
Ivo de Medeiros Varzielas, Steve F. King, Miguel Levy
We present the first complete model of the Littlest Modular Seesaw, based on two right-handed neutrinos, within the framework of multiple modular symmetries, justifying the use of…
Revisiting the Universal Texture Zero of Flavour: a Markov Chain Monte Carlo Analysis
Jordan Bernigaud, Ivo de Medeiros Varzielas, Miguel Levy +1
We revisit the phenomenological predictions of the Universal Texture Zero (UTZ) model of flavour originally presented in arXiv:1710.01741, and update them in light of both improved…
Two A5 modular symmetries for Golden Ratio 2 mixing
Ivo de Medeiros Varzielas, João Lourenço
We present a model of leptonic mixing based on two modular symmetries using the Weinberg operator. The two modular symmetries are broken to the respective diagonal subg…
An inverse seesaw model with perturbed golden ratio mixing
A. E. Cárcamo Hernández, Ivo de Medeiros Varzielas
We propose a theory based on the discrete group which successfully accounts for lepton masses and mixings. In the proposed model, the neutrino masses arise from an inverse se…
Geometric Minimization of Softly-Broken Potentials
Ivo de Medeiros Varzielas, Diogo Ivo
We study the minimization of multi-Higgs models with symmetries that are softly-broken. The powerful method of geometric minimization enables analytic minimization of multi-Higgs m…
3HDM with symmetry and its phenomenological consequences
J. Kalinowski, W. Kotlarski, M. N. Rebelo +1
We perform a comprehensive analysis of a version of the 3-Higgs doublet model whose scalar potential is invariant under a global discrete symmetry and where the three scala…
LHC Signatures of -Flavoured Vector Leptoquarks
Jordan Bernigaud, Monika Blanke, Ivo de Medeiros Varzielas +2
We consider the phenomenological signatures of Simplified Models of Flavourful Leptoquarks, whose Beyond-the-Standard Model (SM) couplings to fermion generations occur via textures…
Two A4 modular symmetries for Tri-Maximal 2 mixing
Ivo de Medeiros Varzielas, João Lourenço
We construct lepton flavour models based on two modular symmetries. The two are broken by a bi-triplet field to the diagonal subgroup, resulting in an effective m…
Controlled fermion mixing and FCNCs in a 3+1 Higgs Doublet Model
A. E. Cárcamo Hernández, Ivo de Medeiros Varzielas, M. L. López-Ibáñez +1
We propose a 3+1 Higgs Doublet Model based on the family symmetry supplemented by several auxiliary cyclic symmetries leading to viable Yukawa textures for the Standard Mod…
Reconstructing Effective Lagrangians Embedding Residual Family Symmetries
Jordan Bernigaud, Ivo de Medeiros Varzielas, Jim Talbert
We consider effective Lagrangians which, after electroweak- and family-symmetry breaking, yield fermionic mass matrices and/or other flavoured couplings exhibiting residual family…
Finite Family Groups for Fermionic and Leptoquark Mixing Patterns
Jordan Bernigaud, Ivo de Medeiros Varzielas, Jim Talbert
We employ a bottom-up and model-independent technique to search for non-Abelian discrete flavour symmetries capable of predicting viable CKM and PMNS matrices alongside of special…
Multiple modular symmetries as the origin of flavour
Ivo de Medeiros Varzielas, Stephen F. King, Ye-Ling Zhou
We develop a general formalism for multiple moduli and their associated modular symmetries. We apply this formalism to an example based on three moduli with finite modular symmetri…
Simplified Models of Flavourful Leptoquarks
Ivo de Medeiros Varzielas, Jim Talbert
We study the implications of single leptoquark extensions of the Standard Model (SM) under the assumption that their enhanced Yukawa sectors are invariant under global Abelian flav…
Dark side of the Seesaw
Subhaditya Bhattacharya, Ivo de Medeiros Varzielas, Biswajit Karmakar +2
In an attempt to unfold (if any) a possible connection between two apparently uncorrelated sectors, namely neutrino and dark matter, we consider the type-I seesaw and a fermion sin…
Fermion Masses and Mixings and Dark Matter Constraints in a Model with Radiative Seesaw Mechanism
Nicolás Bernal, A. E. Cárcamo Hernández, Ivo de Medeiros Varzielas +1
We formulate a predictive model of fermion masses and mixings based on a family symmetry. In the quark sector the model leads to the viable mixing inspired texture where th…
Effective alignments as building blocks of flavour models
Ivo de Medeiros Varzielas, Thomas Neder, Ye-Ling Zhou
Flavour models typically rely on flavons - scalars that break the family symmetry by acquiring vacuum expectation values in specific directions. We develop the idea of effective al…
A Unified Model of Quarks and Leptons with a Universal Texture Zero
Ivo de Medeiros Varzielas, Graham G. Ross, Jim Talbert
We show that a universal texture zero in the (1,1) position of all fermionic mass matrices, including heavy right-handed Majorana neutrinos driving a type-I see-saw mechanism, can…