2.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Instituto Superior TécnicoPT201 papers
- University of LisbonPT82 papers
- Universidade Técnica de LisboaPT54 papers
- Universitat de ValènciaES44 papers
- Instituto Politécnico de LisboaPT30 papers
- Instituto de Física CorpuscularES16 papers
- Thomas Jefferson National Accelerator FacilityUS15 papers
- European Organization for Nuclear ResearchCH13 papers
- Centre National de la Recherche ScientifiqueFR12 papers
- Consejo Superior de Investigaciones CientíficasES10 papers
- Centro de Física Teórica e Computacional9 papers
- University of ÉvoraPT9 papers
23 papers · 1 filter
Singularity-free two-body equation with confining interactions in momentum space
Alfred Stadler, Sofia Leitão, M. T. Peña +1
We are developing a covariant model for all mesons that can be described as quark-antiquark bound states in the framework of the Covariant Spectator Theory (CST) in Minkowski space…
LHC-scale left-right symmetry and unification
Carolina Arbeláez, Martin Hirsch, Michal Malinský +1
We construct a comprehensive list of non-supersymmetric standard model extensions with a low-scale LR-symmetric intermediate stage that may be obtained as simple low-energy effecti…
Quark mass functions and pion structure in Minkowski space
Elmar P. Biernat, Franz Gross, M. T. Peña +1
We present a study of the dressed quark mass function and the pion structure in Minkowski space using the Covariant Spectator Theory. The quark propagators are dressed with the sam…
Witten's loop in the flipped SU(5) unification
Michal Malinský, Carolina Arbeláez Rodríguez, Helena Kolešová
We study a very simple, yet potentially realistic renormalizable flipped SU(5) scenario in which the right-handed neutrino masses are generated at very high energies by means of a…
Confinement, quark mass functions, and spontaneous chiral symmetry breaking in Minkowski space
Elmar P. Biernat, Franz Gross, M. T. Peña +1
We formulate the covariant equations for quark-antiquark bound states in Minkowski space in the framework of the Covariant Spectator Theory. The quark propagators are dressed with…
Pion electromagnetic form factor in the Covariant Spectator Theory
Elmar P. Biernat, Franz Gross, M. T. Peña +1
The pion electromagnetic form factor at spacelike momentum transfer is calculated in relativistic impulse approximation using the Covariant Spectator Theory. The same dressed quark…
Scalar sector properties of two-Higgs-doublet models with a global U(1) symmetry
Gautam Bhattacharyya, Dipankar Das, Palash B. Pal +1
We analyze the scalar sector properties of a general class of two-Higgs-doublet models which has a global U(1) symmetry in the quartic terms. We find constraints on the parameters…
Slepton mass splittings and cLFV in the SUSY seesaw in the light of recent experimental results
A. J. R. Figueiredo, A. M. Teixeira
Following recent experimental developments, in this study we re-evaluate if the interplay of high- and low-energy lepton flavour violating observables remains a viable probe to tes…
Witten's mechanism in the flipped SU(5) unification
Carolina Arbeláez, Helena Kolešová, Michal Malinský
We argue that the Witten's loop mechanism for the right-handed Majorana neutrino mass generation identified originally in the SO(10) grand unification context can be successfully a…
Anomaly-free U(1) gauge symmetries in neutrino seesaw flavor models
Luis M. Cebola, David Emmanuel-Costa, Ricardo Gonzalez Felipe
Adding right-handed neutrino singlets and/or fermion triplets to the particle content of the Standard Model allows for the implementation of the seesaw mechanism to give mass to ne…
Valence quark and meson cloud contributions to the form factors
G. Ramalho, M. T. Peña
The covariant spectator quark model is applied to the reaction. The valence quark contributions to the electromagnetic form factors and helicity transit…
Number of fermion generations from a novel Grand Unified model
Pritibhajan Byakti, David Emmanuel-Costa, Arindam Mazumdar +1
Electroweak interactions based on a gauge group , coupled to the QCD gauge group , can predict the number of generations to be multiples of…
Renormalization group equations and matching in a general quantum field theory with kinetic mixing
Renato M. Fonseca, Michal Malinsky, Florian Staub
We work out a set of simple rules for adopting the two-loop renormalization group equations of a generic gauge field theory given in the seminal works of Machacek and Vaughn to the…
Baryogenesis through split Higgsogenesis
Sacha Davidson, Ricardo Gonzalez Felipe, H. Serodio +1
We study the cosmological evolution of asymmetries in the two-Higgs doublet extension of the Standard Model, prior to the electroweak phase transition. If Higgs flavour-exchanging…
On baryogenesis from dark matter annihilation
Nicolas Bernal, Stefano Colucci, Francois-Xavier Josse-Michaux +2
We study in detail the conditions to generate the baryon asymmetry of the universe from the annihilation of dark matter. This scenario requires a low energy mechanism for thermal b…
Neutrino masses and mixing in A4 models with three Higgs doublets
R. Gonzalez Felipe, H. Serodio, Joao P. Silva
We study neutrino masses and mixing in the context of flavor models with A4 symmetry, three scalar doublets in the triplet representation, and three lepton families. We show that t…
The minimal adjoint-SU(5)xZ_4 GUT model
D. Emmanuel-Costa, C. Simoes, M. Tortola
An extension of the adjoint SU(5) model with a flavour symmetry based on the Z_4 group is investigated. The Z_4 symmetry is introduced with the aim of leading the up- and down-quar…
Potential of a Linear Collider for Lepton Flavour Violation studies in the SUSY seesaw
A. J. R. Figueiredo, A. Abada, J. C. Romao +1
We study the potential of an e+- e- Linear Collider for charged lepton flavour violation studies in a supersymmetric framework where neutrino masses and mixings are explained by a…
Constraints on dark matter annihilation from CMB observations before Planck
Laura Lopez-Honorez, Olga Mena, Sergio Palomares-Ruiz +1
We compute the bounds on the dark matter (DM) annihilation cross section using the most recent Cosmic Microwave Background measurements from WMAP9, SPT'11 and ACT'10. We consider D…
Inside the SU(3) quark-antiquark QCD flux tube: screening versus quantum widening
N. Cardoso, M. Cardoso, P. Bicudo
In lattice QCD, colour confinement manifests in flux tubes. We compute in detail the quark-antiquark flux tube for pure gauge SU(3) dimension for quark-antiquark distances…
Models with three Higgs doublets in the triplet representations of A4 or S4
R. Gonzalez Felipe, H. Serodio, Joao P. Silva
We consider the quark sector of theories containing three scalar SU(2)_L doublets in the triplet representation of A4 (or of S4) and three generations of quarks in arbitrary A4 (or…
Extended evolution equations for neutrino propagation in astrophysical and cosmological environments
Cristina Volpe, Daavid Väänänen, Catalina Espinoza
We derive the evolution equations for a system of neutrinos interacting among themselves and with a matter background, based upon the Bogoliubov-Born-Green-Kirkwood-Yvon (BBGKY) hi…
Flavoured CP asymmetries for type II seesaw leptogenesis
R. Gonzalez Felipe, F. R. Joaquim, H. Serodio
A novel contribution to the leptonic CP asymmetries in type II seesaw leptogenesis scenarios is obtained for the cases in which flavor effects are relevant for the dynamics of lept…