A5036943225- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Radioactive Decay and Measurement Techniques
- Geophysical and Geoelectrical Methods
- Scientific Research and Discoveries
- Diverse Aspects of Tourism Research
- Holomorphic and Operator Theory
- Physics of Superconductivity and Magnetism
- Mathematical functions and polynomials
- Advanced Algebra and Geometry
- Quantum chaos and dynamical systems
- Particle Accelerators and Free-Electron Lasers
- Migration, Aging, and Tourism Studies
- Quantum, superfluid, helium dynamics
University of Lisbon
2014-2024
Instituto Politécnico de Lisboa
2000-2022
Western Norway University of Applied Sciences
2018-2022
Norwegian University of Science and Technology
2022
Instituto Superior Técnico
2007-2020
European Organization for Nuclear Research
2001-2020
University of Bergen
2016-2020
Nordic Institute for Theoretical Physics
2009
Max Planck Institute for Physics
2005
Stanford University
1993-2000
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...
We review the theory and phenomenology of isosinglet vector-like quarks (VLQs). In recent years, interest in VLQs has been increasing, due to their contributions new physics effects that can be tested experiments at LHC High-Luminosity LHC. The similarities models with seesaw framework leptonic sector are pointed out. existence leads flavour-changing neutral currents tree level deviations from unitarity CKM matrix, introducing rich phenomenological implications. These naturally suppressed by...
We analyse various flavour changing processes like $t\to hu,hc$, $h\to \tau e,\tau\mu$ as well hadronic decays bs,bd$, in the framework of a class two Higgs doublet models where there are neutral scalar currents at tree level. These have remarkable feature having these flavour-violating couplings entirely determined by CKM and PMNS matrices $\tan\beta$. The structure results from symmetry Lagrangian therefore it is natural stable under renormalization group. show that some rates above can...
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...
We propose an extension of the hypothesis Minimal Flavour Violation (MFV) to general multi-Higgs Models without assumption Natural Conservation in Higgs sector. study detail under what conditions neutral couplings are only functions $V_{CKM}$ and a MFV expansion for fermions.
A bstract We point out that hints of deviations from unitarity in the first row CKM matrix may be explained by presence a single vector-like top. study how stringent experimental constraints arising CP Violation kaon sector and meson mixing such as $$ {D}^0\hbox{-} {\overline{D}}^0,{K}^0\hbox{-} {\overline{K}}^0 <mml:math...
We study mixing and $\mathrm{CP}$ violation of three left-handed Majorana neutrinos in the limit exactly degenerate masses, identify weak-basis invariant relevant for violation, show that leptonic matrix is parametrized only by two angles one phase. After lifting degeneracy, this parametrization accommodates present data on atmospheric solar neutrinos, as well double $\ensuremath{\beta}$ decay. Some Ans\"atze suggested literature correspond to special cases parametrization.
We present CP-odd Higgs-basis invariants, which can be used to signal CP violation in a multi-Higgs system, written an arbitrary Higgs basis. It is shown through specific examples how these invariants also useful determine the character of breaking (i.e. whether it hard or soft breaking) given Lagrangian. analyse detail cases two and three doublets.
We study in detail models with vectorlike quarks, special emphasis on their implications for $\mathrm{CP}$ asymmetries ${B}^{0}$ decays. In this class of there are deviations from unitarity the Cabibbo-Kobayashi-Maskawa matrix and flavor-changing neutral currents which, although naturally suppressed, may have important consequences. show that even a relatively small contribution $Z$-mediated to ${B}^{0}\ensuremath{-}{\overline{B}}^{0}$ mixing can lead significant departures predictions standard model
We investigate the viability of thermal leptogenesis in type-I seesaw models with leptonic flavor symmetries that lead to tribimaximal neutrino mixing. consider an effective theory ${A}_{4}\ifmmode\times\else\texttimes\fi{}{Z}_{3}\ifmmode\times\else\texttimes\fi{}{Z}_{4}$ symmetry, which is spontaneously broken at a scale much higher than electroweak scale. At high scale, Yukawa interactions exact mixing and heavy Majorana mass spectrum exactly degenerate. In this framework, becomes viable...
We analyse the constraints and some of phenomenological implications a class two Higgs doublet models where there are flavour-changing neutral currents (FCNC) at tree level but potentially dangerous FCNC couplings suppressed by small entries CKM matrix V. This have remarkable feature that, as result discrete symmetry Lagrangian, entirely fixed in quark sector V ratio v 2/v 1 vevs Higgs. The is extended to leptonic sector, so that with their flavour structure mixing matrix. large number...
We investigate, within the type I seesaw framework, physical implications of zero textures in Yukawa couplings which generate neutrino Dirac mass matrix ${m}_{D}$. It is shown that four maximal number texture zeros compatible with observed leptonic mixing and assumption no vanishes. classify all allowed four-zero ${m}_{D}$ into two categories three classes each. show different classes, general, admit $CP$ violation both at low high energies. further present constraints obtained for energy...
We point out that in the standard model there is meaningful quark mixing even extreme chiral (EC) limit, where only third generation of quarks acquires mass. This general expected to be order 1 and fact $|{V}_{13}{|}^{2}+|{V}_{23}{|}^{2}\ensuremath{\approx}1.6\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}3}$ implies a novel fine-tuning problem SM which we for first time. propose possible way avoiding this by introducing symmetry $S$ leads ${V}_{\mathrm{CKM}}=\mathbb{1}$, with...