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
18 papers · 1 filter
Inert-Sterile Neutrino: Cold or Warm Dark Matter Candidate
Graciela B. Gelmini, Efunwande Osoba, Sergio Palomares-Ruiz
In usual particle models, sterile neutrinos can account for the dark matter of the Universe only if they have masses in the keV range and are warm dark matter. Stringent cosmologic…
Lattice QCD computation of the colour fields for the static hybrid quark-gluon-antiquark system, and microscopic study of the Casimir scaling
M. Cardoso, N. Cardoso, P. Bicudo
The chromoelectric and chromomagnetic fields, created by a static gluon-quark-antiquark system, are computed in quenched SU(3) lattice QCD, in a lattice at …
Dark matter detection in the BMSSM
Nicolas Bernal, Andreas Goudelis
The addition of non-renormalizable terms involving the Higgs fields to the MSSM (BMSSM) ameliorates the little hierarchy problem of the MSSM. For neutralino dark matter, new region…
Minimal Flavour Violation and Multi-Higgs Models
F. J. Botella, G. C. Branco, M. N. Rebelo
We propose an extension of the hypothesis of Minimal Flavour Violation (MFV) to general multi-Higgs Models without the assumption of Natural Flavour Conservation in the Higgs secto…
Using baryon octet magnetic moments and masses to fix the pion cloud contribution
Franz Gross, G. Ramalho, K. Tsushima
Using SU(3) symmetry to constrain the pion BB' couplings, assuming SU(3) breaking comes only from one-loop pion cloud contributions, and using the the covariant spectator theory to…
Minimal Supersymmetric Inverse Seesaw: Neutrino masses, lepton flavour violation and LHC phenomenology
M. Hirsch, T. Kernreiter, J. C. Romao +1
We study neutrino masses in the framework of the supersymmetric inverse seesaw model. Different from the non-supersymmetric version a minimal realization with just one pair of sing…
Remaining inconsistencies with solar neutrinos: can spin flavour precession provide a clue?
Joao Pulido, C R Das, Marco Picariello
A few inconsistencies remain after it has been ascertained that LMA is the dominant solution to the solar neutrino problem: why is the SuperKamiokande spectrum flat and why is the…
Lepton flavour violating slepton decays to test type-I and II seesaw at the LHC
Albert Villanova del Moral
Searches at the LHC of lepton flavour violation (LFV) in slepton decays can indirectly test both type-I and II seesaw mechanisms. Assuming universal flavour-blind boundary conditio…
Tri-Bimaximal Lepton Mixing and Leptogenesis
D. Aristizabal Sierra, F. Bazzocchi, I. de Medeiros Varzielas +2
In models with flavour symmetries added to the gauge group of the Standard Model the CP-violating asymmetry necessary for leptogenesis may be related with low-energy parameters. A…
Constraints on leptogenesis from a symmetry viewpoint
R. Gonzalez Felipe, H. Serodio
It is shown that type I seesaw models based on the standard model Lagrangian extended with three heavy Majorana right-handed fields do not have leptogenesis in leading order, if th…
Present and Future Gamma-Ray Probes of the Cygnus OB2 Environment
Luis A. Anchordoqui, Haim Goldberg, Russell D. Moore +3
The MAGIC Collaboration has provided new observational data pertaining to the TeV J2032+4130 gamma-ray source (within the Cygnus OB2 region), for energies E_gamma >400 GeV. It is t…
Constraints on unparticle long range forces from big bang nucleosynthesis bounds on the variation of the gravitational coupling
O. Bertolami, N. M. C. Santos
We use big bang nucleosynthesis bounds on the variation of the gravitational coupling to derive constraints on the strength of the deviation from the gravitational inverse-square l…
Gluon Excitations and Quark Chiral Symmetry in the Meson Spectrum: an Einbein Solution to the Large Degeneracy Problem of Light Mesons
P. Bicudo
A large approximate degeneracy of the excited hadron spectra, appears in the light meson spectra measured at LEAR, suggesting a novel principal quantum number n+j in QCD spectra. W…
Reconstruction of Quark Mass Matrices with Weak Basis Texture Zeroes from Experimental Input
D. Emmanuel-Costa, C. Simoes
All quark mass matrices with texture zeroes obtained through weak basis transformations are confronted with the experimental data. The reconstruction of the quark mass matrices M_u…
Electric quadrupole and magnetic octupole moments of the Delta
G. Ramalho, M. T. Pena, Franz Gross
Using a covariant spectator constituent quark model we predict an electric quadrupole moment -0.043 efm^2 and a magnetic octupole moment -0.0035 efm^3 for the Delta+ excited state…
Anomaly-free constraints in neutrino seesaw models
D. Emmanuel-Costa, Edison T. Franco, R. Gonzalez Felipe
The implementation of seesaw mechanisms to give mass to neutrinos in the presence of an anomaly-free U(1)_X gauge symmetry is discussed in the context of minimal extensions of the…
Quasi-degenerate neutrinos and tri-bi-maximal mixing
Ivo de Medeiros Varzielas
Assuming high-energy tri-bi-maximal mixing we study the radiative running of leptonic mixing angles and obtain limits on the high-energy scale from requiring consistency with the o…
Valence quark contribution for the gamma N -> Delta quadrupole transition extracted from lattice QCD
G. Ramalho, M. T Pena
Starting with a spectator quark model developed for the nucleon (N) and the Delta in the physical pion mass region, we extend the predictions of the reaction gamma N -> Delta to th…