A5040068533- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Genomics and Chromatin Dynamics
- Radioactive Decay and Measurement Techniques
- Fluid Dynamics and Heat Transfer
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Cyclone Separators and Fluid Dynamics
- Electron and X-Ray Spectroscopy Techniques
- Advanced Data Storage Technologies
Instituto Politécnico de Lisboa
2014-2024
University of Lisbon
2014-2024
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2023-2024
Scuola Internazionale Superiore di Studi Avanzati
2015
Instituto Superior Técnico
2001-2013
European Organization for Nuclear Research
2010
Universidad Autónoma de Madrid
2008-2009
University of Padua
2005-2008
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2005-2007
Fundação para a Ciência e Tecnologia
2001-2004
The exploration of the universe has recently entered a new era thanks to multi-messenger paradigm, characterized by continuous increase in quantity and quality experimental data that is obtained detection various cosmic messengers (photons, neutrinos, rays gravitational waves) from numerous origins. They give us information about their sources properties intergalactic medium. Moreover, astronomy opens up possibility search for phenomenological signatures quantum gravity. On one hand, most...
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
Several topics on $CP$ violation in the lepton sector are reviewed. A few theoretical aspects concerning neutrino masses, leptonic mixing, and will be covered, with special emphasis seesaw models. discussion is provided observable effects which manifest presence of violation, particularly, oscillations neutrinoless double beta decay processes, their possible implications collider experiments such as LHC. The role that may have played generation baryon asymmetry Universe through mechanism...
The relation between leptogenesis and CP violation at low energies is analyzed in detail the framework of minimal seesaw mechanism. Working, without loss generality, a weak basis where both charged lepton right-handed Majorana mass matrices are diagonal real, we consider convenient generic parametrization Dirac neutrino Yukawa coupling matrix identify necessary condition which has to be satisfied order establish direct link energies. In context LMA solution solar problem, present scenarios...
Flavour effects due to lepton interactions in the early Universe may have played an important role generation of cosmological baryon asymmetry through leptogenesis. If only source high-energy CP violation comes from left-handed leptonic sector, then it is possible establish a bridge between flavoured leptogenesis and low-energy violation. We explore this connection taking into account our present knowledge about neutrino parameters matter–antimatter observed Universe. In framework, we find...
We consider the small excesses around 95 GeV found in several searches for a new scalar $\ensuremath{\gamma}\ensuremath{\gamma}$, $\ensuremath{\tau}\ensuremath{\tau}$, and $b\overline{b}$ final states. Instead of trying to accommodate them all, as is usually done literature, context given Standard Model (SM) extension, we investigate whether it would be possible that one or two these correspond an actual scalar, while remaining ones are merely statistical fluctuations. To this end, use...
We study the possibility that baryon asymmetry of Universe is generated in a minimal seesaw scenario where two right-handed Majorana neutrinos with degenerate masses are added to standard model particle content. In usual framework thermal leptogenesis, nonzero $CP$ can be obtained through mass splitting induced by running heavy neutrino from their degeneracy scale down scale. Although, light present oscillation data, produced turns out smaller than experimental value, mechanism could viable...
A bstract We propose simple scoto-seesaw models to account for dark matter and neutrino masses with spontaneous CP violation. This is achieved a single horizontal $$ {\mathcal{Z}}_8 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>Z</mml:mi> <mml:mn>8</mml:mn> </mml:msub> </mml:math> discrete symmetry, broken residual {\mathcal{Z}}_2 <mml:mn>2</mml:mn> subgroup responsible stabilizing matter. spontaneously via the complex vacuum expectation value of scalar...
We propose a KSVZ-type axion framework in which vector-like quarks (VLQ) and colored scalars generate Dirac neutrino masses radiatively. The global Peccei-Quinn symmetry (under the exotic fermions are charged) addresses strong CP problem ensures nature of neutrinos. also accounts for observed cosmological dark matter. systematically explore all viable VLQ representations. Depending on specific scenario, predicts distinct axion-to-photon couplings, testable through haloscope helioscope...
We consider a simple extension of the Standard Model by adding two Higgs triplets and complex scalar singlet to its particle content. In this framework, $CP$ symmetry is spontaneously broken at high energies vacuum expectation value singlet. Such breaking leads leptonic violation low energies. The model also exhibits an ${A}_{4}\ifmmode\times\else\texttimes\fi{}{Z}_{4}$ flavor which, after being high-energy scale, yields tribimaximal pattern in lepton sector. small perturbations around...
A bstract In the framework of two right-handed neutrino seesaw model, we consider maximally-restrictive texture-zero patterns for lepton Yukawa coupling and mass matrices, together with existence a remnant CP symmetry. Under this premise, find that several textures are compatible most recent data coming from oscillation neutrinoless double beta decay experiments. It is shown that, maximum number allowed texture zeros in Dirac matrix two, an inverted spectrum. contrast, matrices just one...
The recent measurement of the muon $g - 2$ anomaly continues to defy a Standard Model explanation, but can be accommodated within framework two Higgs doublet models. If one further includes extra fermion content in form generation vector like leptons, allowed parameter range that explains is even extended, and thorny issues perturbativity clashes with $B$-decay constraints avoided. We will show how magnetic moment fit these models, under assumption vector-like leptons do not mix muon. update...
A bstract Texture zeros in fermion mass matrices have been widely considered tackling the Standard Model flavour puzzle. In this work, we perform a systematic analysis of texture lepton framework $$ {\Gamma}_3^{\prime}\cong {T}^{\prime } <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Γ</mml:mi> <mml:mn>3</mml:mn> <mml:mo>′</mml:mo> </mml:msubsup> <mml:mo>≅</mml:mo> <mml:msup> <mml:mi>T</mml:mi> </mml:msup> </mml:math> modular symmetry. Assuming that fields...
We propose a novel supersymmetric unified scenario of the triplet seesaw mechanism where exchange heavy triplets generates both neutrino masses and soft supersymmetry breaking terms. Our framework is very predictive since it relates mass parameters, lepton-flavor-violation in slepton sector, sparticle Higgs spectra, electroweak symmetry breakdown. The phenomenological viability experimental signatures lepton flavor-violating processes are discussed.
The CMS collaboration has recently reported a 2.8$\sigma$ excess of $eejj$ events with an invariant mass around 2 TeV. This observation can be explained in the context standard model extensions new gauge bosons $W'$, $Z'$ and heavy neutrinos coupling (mainly) to electron. We discuss additional signals that allow confirm or discard $W'$ hypotheses.
Abstract Cascade decays of new scalars into final states with multiple photons and possibly quarks may lead to distinctive experimental signatures at high-energy colliders. Such signals are even more striking if the highly boosted, as when produced from decay a much heavier resonance. We study this type events within framework minimal stealth boson model, an anomaly-free $$\text {U}(1)_{Y'}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>U</mml:mtext>...
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. synergy between these two approaches requires direct measurement couplings. We discuss strategy to perform such measurements LHC context left-right symmetric models, which is also applicable other models implementing type-III seesaw. demonstrate that ambiguities determination mixing parameters resolved by performing an...
The neutrino mass and dark matter (DM) problems are addressed in a Standard Model extension where the type-II seesaw scotogenic mechanisms coexist. model features flavour $\mathcal{Z}_8$ discrete symmetry which is broken down to $\mathcal{Z}_2$, stabilising (scalar or fermion) DM particle. Spontaneous CP violation implemented through complex vacuum expectation value of singlet scalar field, inducing observable CP-violating effects lepton sector. structure effective matrix leads constraints...
In the context of Standard Model (SM) extensions, seesaw mechanism provides most natural explanation for smallness neutrino masses. this work we consider economical type-I realization in which two right-handed neutrinos are added to SM field content. For sake predictability, impose maximum number texture zeros lepton Yukawa and mass matrices. All possible patterns analyzed light recent oscillation data, predictions leptonic CP violation presented. We conclude that, charged-lepton basis,...
A bstract Jet identification tools are crucial for new physics searches at the LHC and future colliders. We introduce concept of Mass Unspecific Supervised Tagging (MUST) which relies on considering both jet mass transverse momentum varying over wide ranges as input variables — together with substructure observables a multivariate tool. This approach not only provides single efficient tagger arbitrary momentum, but also an optimal solution correlation problem inherent to current taggers. By...
In the vanilla type-I seesaw leptogenesis scenario, CP violation required to generate lepton asymmetries in heavy Majorana neutrino decays stem from complex Dirac-type Yukawa couplings. this paper we explore case which that originates vacuum expectation value of a scalar singlet at very high scale. This non-trivial CP-violating phase can be successfully communicated low-energy sector via portal. The new scalar-singlet degrees freedom contributions relevant for not only one-loop level but...