2.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Instituto Superior TécnicoPT388 papers
- Centro de Física Teórica de Partículas54 papers
- University of ViennaAT37 papers
- Centre National de la Recherche ScientifiqueFR34 papers
- University of LisbonPT34 papers
- University of MississippiUS31 papers
- Universitat de ValènciaES27 papers
- California Institute of TechnologyUS25 papers
- University of CoimbraPT19 papers
- European Organization for Nuclear ResearchCH18 papers
- Instituto de TelecomunicaçõesPT18 papers
- Instituto Politécnico de LisboaPT17 papers
29 papers · 2 filters
Flavour models for TM1 lepton mixing
Ivo de Medeiros Varzielas, Luís Lavoura
We present a framework for lepton flavour models such that the first column of the lepton mixing matrix is (2,-1,-1)/sqrt(6). We show that the flavour symmetry group adequate for t…
X(3872) is not a true molecule
Susana Coito, George Rupp, Eef van Beveren
A solvable coordinate-space model is employed to study the component of the X(3872) wave function, by coupling a confined state to the almost unbound…
Evading death by vacuum
A. Barroso, P. M. Ferreira, I. P. Ivanov +2
In the Standard Model, the Higgs potential allows only one minimum at tree-level. But the open possibility that there might be two scalar doublets enriches the vacuum structure, al…
Observing Higgs boson production through its decay into gamma-rays: A messenger for Dark Matter candidates
Nicolas Bernal, Celine Boehm, Sergio Palomares-Ruiz +2
In this Letter, we study the gamma-ray signatures subsequent to the production of a Higgs boson in space by dark matter annihilations. We investigate the cases where the Higgs boso…
An analysis of the influence of background subtraction and quenching on jet observables in heavy-ion collisions
Liliana Apolinário, Néstor Armesto, Leticia Cunqueiro
Subtraction of the large background in reconstruction is a key ingredient in jet studies in high-energy heavy-ion collisions at RHIC and the LHC. Here we address the question to wh…
Invariants and Flavour in the General Two-Higgs Doublet Model
F. J. Botella, G. C. Branco, M. N. Rebelo
The flavour structure of the general Two Higgs Doublet Model (2HDM) is analysed and a detailed study of the parameter space is presented, showing that flavour mixing in the 2HDM ca…
Phenomenology of WIMPy baryogenesis models
Nicolas Bernal, Francois-Xavier Josse-Michaux, Lorenzo Ubaldi
A possible connection between the abundances of baryonic and dark matter (DM) has been explored so far mostly in the context of the so-called asymmetric DM. Recently, a very differ…
Self-Organizing Neutrino Mixing Matrix
Ernest Ma
A new and novel idea for a predictive neutrino mass matrix is presented, using the non-Abelian discrete symmetry A(4) and the seesaw mechanism with only two heavy neutral fermion s…
Lattice QCD signal for a bottom-bottom tetraquark
Pedro Bicudo, Marc Wagner
Utilizing lattice QCD results for the potential of two static antiquarks and two dynamical quarks as well as quark model techniques for the dynamics of two heavy antiquarks in a cl…
Higgs Decays in the Low Scale Type I See-Saw Model
C. Garcia Cely, A. Ibarra, E. Molinaro +1
The couplings of the low scale type I see-saw model are severely constrained by the requirement of reproducing the correct neutrino mass and mixing parameters, by the non-observati…
A novel way of constraining WIMPs annihilations in the Sun: MeV neutrinos
Nicolas Bernal, Justo Martin-Albo, Sergio Palomares-Ruiz
Annihilation of dark matter particles accumulated in the Sun would produce a flux of high-energy neutrinos whose prospects of detection in neutrino telescopes and detectors have be…
mu-tau Interchange symmetry and lepton mixing
W. Grimus, L. Lavoura
We focus on the use of a mu-tau interchange symmetry to explain features of lepton mixing, especially maximal atmospheric neutrino mixing. We review two models which achieve this g…
Constrained SUSY seesaws with a 125 GeV Higgs
M. Hirsch, F. R. Joaquim, A. Vicente
Motivated by the ATLAS and CMS discovery of a Higgs-like boson with a mass around 125 GeV, and by the need of explaining neutrino masses, we analyse the three canonical SUSY versio…
The Hunt for New Physics in the Flavour Sector with up vector-like quarks
F. J. Botella, G. C. Branco, M. Nebot
We analyse the possible presence of New Physics (NP) in the Flavour Sector and evaluate its potential for solving the tension between the experimental values of $\AJPKs$ and $\BTNu…
Scalar-particle self-energy amplitudes and confinement in Minkowski space
Elmar P. Biernat, Franz Gross, Teresa Peña +1
We analyze the analytic structure of the Covariant Spectator Theory (CST) contribution to the self-energy amplitude for a scalar particle in a ϕ^2 χ-theory. To this end we derive d…
Measuring heavy neutrino couplings at the LHC
J. A. Aguilar-Saavedra, F. R. Joaquim
The existence of heavy neutrinos mediating neutrino masses via a type-I seesaw can be directly probed at the LHC, or indirectly in rare lepton flavor-violating processes. The syner…
Maximal CP violation in lepton mixing from a model with Delta(27) flavour symmetry
P. M. Ferreira, W. Grimus, L. Lavoura +1
We propose a simple mechanism which enforces |U_{mu j}| = | U_{tau j}| forall j = 1,2,3 in the lepton mixing matrix U. This implies maximal atmospheric neutrino mixing and a maxima…
Probing the scalar-pseudoscalar mixing in the 125 GeV Higgs particle with current data
A. Barroso, P. M. Ferreira, Rui Santos +1
LHC has found hints for a Higgs particle of 125 GeV. We investigate the possibility that such a particle is a mixture of scalar and pseudoscalar states. For definiteness, we concen…
The mu - e Conversion in Nuclei, mu --> e gamma, mu --> 3e Decays and TeV Scale See-Saw Scenarios of Neutrino Mass Generation
D. N. Dinh, A. Ibarra, E. Molinaro +1
We perform a detailed analysis of lepton flavour violation (LFV) within minimal see-saw type extensions of the Standard Model (SM), which give a viable mechanism of neutrino mass g…
Accidental stability of dark matter
L. Lavoura, S. Morisi, J. W. F. Valle
We propose that dark matter is stable as a consequence of an accidental Z2 that results from a flavour-symmetry group which is the double-cover group of the symmetry group of one o…
The contribution of medium-modified color flow to jet quenching
A. Beraudo, J. G. Milhano, U. A. Wiedemann
Multiple interactions between parton showers and the surrounding QCD matter are expected to underlie the strong medium-modifications of jet observables in ultra-relativistic heavy…
Geometrical CP violation from non-renormalisable scalar potentials
Ivo de Medeiros Varzielas, David Emmanuel-Costa, Philipp Leser
We consider in detail the non-renormalisable scalar potential of three Higgs doublets transforming as an irreducible triplet of Delta(27) or Delta(54). We start from a renormalisab…
Spontaneous leptonic CP violation and nonzero
G. C. Branco, R. Gonzalez Felipe, F. R. Joaquim +1
We consider a simple extension of the Standard Model by adding two Higgs triplets and a complex scalar singlet to its particle content. In this framework, the CP symmetry is sponta…
Linear vs non-linear QCD evolution: from HERA data to LHC phenomenology
J. L. Albacete, J. G. Milhano, P. Quiroga-Arias +1
The very precise combined HERA data provides a testing ground in which the relevance of novel QCD regimes, other than the successful linear DGLAP evolution, in small-x inclusive DI…