18.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of LisbonPT1.3k papers
- Universidade Técnica de LisboaPT388 papers
- Centre National de la Recherche ScientifiqueFR326 papers
- Instituto de Plasmas e Fusão NuclearPT209 papers
- European Organization for Nuclear ResearchCH202 papers
- Centro de Física Teórica de Partículas201 papers
- Instituto Politécnico de LisboaPT190 papers
- Instituto de TelecomunicaçõesPT175 papers
- Universitat de ValènciaES175 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR143 papers
- Centro de Astrofísica e GravitaçãoPT133 papers
- LIP - Laboratory of Instrumentation and Experimental Particle PhysicsPT133 papers
28 papers · 2 filters
Lepton mixing and the charged-lepton mass ratios
D. Jurciukonis, L. Lavoura
We construct a class of renormalizable models for lepton mixing that generate predictions given in terms of the charged-lepton mass ratios. We show that one of those models leads,…
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…
Radiative neutrino masses from order-4 CP symmetry
Igor P. Ivanov
Generalized CP symmetry of order 4 (CP4) is surprisingly powerful in shaping scalar and quark sectors of multi-Higgs models. Here, we extend this framework to the neutrino sector.…
The C2HDM revisited
Duarte Fontes, Margarete Mühlleitner, Jorge C. Romão +3
The complex two-Higgs doublet model is one of the simplest ways to extend the scalar sector of the Standard Model to include a new source of CP-violation. The model has been used a…
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…
Probing the time structure of the quark-gluon plasma with top quarks
Liliana Apolinário, José Guilherme Milhano, Gavin P. Salam +1
The tiny droplets of Quark Gluon Plasma (QGP) created in high-energy nuclear collisions experience fast expansion and cooling with a lifetime of a few . Despite the in…
CP4 miracle: shaping Yukawa sector with CP symmetry of order four
P. M. Ferreira, Igor P. Ivanov, Enrique Jiménez +2
We explore the phenomenology of a unique three-Higgs-doublet model based on the single CP symmetry of order 4 (CP4) without any accidental symmetries. The CP4 symmetry is imposed o…
Electromagnetic decays of the neutral pion investigated in the Dyson-Schwinger formalism
Esther Weil, Gernot Eichmann, Christian S. Fischer +1
We summarize recent work in determining the transition form factor (TFF) of the neutral pion (), by solving the non-perturbative Dyson-Schwinger and Bethe-Salpeter…
CP violation in 2HDM and EFT: the ZZZ vertex
Hermès Bélusca-Maïto, Adam Falkowski, Duarte Fontes +2
We study the CP violating ZZZ vertex in the two-Higgs doublet model, which is a probe of a Jarlskog-type invariant in the extended Higgs sector. The form factor is evaluate…
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…
Threshold Collision Energy of the QCD Phase Diagram Tricritical Endpoint
K. A. Bugaev, R. Emaus, V. V. Sagun +7
Using the most advanced formulation of the hadron resonance gas model we analyze the two sets of irregularities found at chemical freeze-out of central nuclear-nuclear collisions a…
Determination of the octant in long baseline neutrino experiments within and beyond the standard model
C. R. Das, Jukka Maalampi, João Pulido +1
The recent data indicate that the neutrino mixing angle deviates from the maximal-mixing value of 45, showing two nearly degenerate solutions, one in the lower oct…
Covariant spectator theory of quark-antiquark bound states: Mass spectra and vertex functions of heavy and heavy-light mesons
Sofia Leitão, Alfred Stadler, M. T. Peña +1
We use the covariant spectator theory with an effective quark-antiquark interaction, containing Lorentz scalar, pseudoscalar, and vector contributions, to calculate the masses and…
Electromagnetic decays of the neutral pion
Esther Weil, Gernot Eichmann, Christian S. Fischer +1
We complement studies of the neutral pion transition form factor pi^0 --> gamma^(*) gamma^(*) with calculations for the electromagnetic decay widths of the processes pi^0 --> e^+ e…
Exploring the Quark Flavour Puzzle within the 3 Higgs Model
Nuno Rosa Agostinho, David Emmanuel-Costa, J. I. Silva-Marcos
We extend the standard model with two extra Higgs doublets. Making use of a symmetry principle, we present flavour symmetries based on cycle groups that oblige each Higgs dou…
The discrete charm of flavour and CP violation
G. C. Branco, M. N. Rebelo
We point out that in the Standard Model (SM) there is no explanation why is of order . A framework is described for explaining this small mixing,…
Minima of multi-Higgs potentials with triplets of and
Ivo de Medeiros Varzielas, Stephen F. King, Christoph Luhn +1
We analyse the minima of scalar potentials for multi-Higgs models where the scalars are arranged as either one triplet or two triplets of the discrete symmetries , , $Δ(2…
On the large-Q^2 behavior of the pion transition form factor
Gernot Eichmann, Christian S. Fischer, Esther Weil +1
We study the transition of non-perturbative to perturbative QCD in situations with possible violations of scaling limits. To this end we consider the singly- and doubly-virtual pio…
Spontaneous symmetry breaking in three-Higgs-doublet -symmetric models
D. Emmanuel-Costa, O. M. Ogreid, P. Osland +1
The talk summarises work done by the authors consisting of a detailed study of the possible vacua in models with three Higgs doublets with symmetry and without explicit CP vi…
CP-odd invariants for multi-Higgs models and applications with discrete symmetry
Ivo de Medeiros Varzielas
CP-odd invariants are useful for studying the CP properties of Lagrangians in any basis. We explain how to build basis invariants for the scalar sector, and how to distinguish CP-o…
Controlled Flavour Changing Neutral Couplings in Two Higgs Doublet Models
Joao M. Alves, Francisco J. Botella, Gustavo C. Branco +2
We propose a class of Two Higgs Doublet Models where there are Flavour Changing Neutral Currents (FCNC) at tree level, but under control due to the introduction of a discrete symme…
Hadron Resonance Gas Model with Induced Surface Tension
V. V. Sagun, K. A. Bugaev, A. I. Ivanytskyi +6
Here we present a physically transparent generalization of the multicomponent Van der Waals equation of state in the grand canonical ensemble. For the one-component case the third…
Building and testing models with extended Higgs sectors
Igor P. Ivanov
Models with non-minimal Higgs sectors represent a mainstream direction in theoretical exploration of physics opportunities beyond the Standard Model. Extended scalar sectors help a…
Relativistic phenomenology of meson spectra with a covariant quark model in Minkowski space
Sofia Leitão, Alfred Stadler, M. T. Peña +1
In this work, we perform a covariant treatment of quark-antiquark systems. We calculate the spectra and wave functions using a formalism based on the Covariant Spectator Theory (CS…