A5016113223- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Mathematical Biology Tumor Growth
- Numerical methods in inverse problems
- Particle accelerators and beam dynamics
- Quantum chaos and dynamical systems
- Distributed and Parallel Computing Systems
- Opinion Dynamics and Social Influence
- Advanced NMR Techniques and Applications
- History and Theory of Mathematics
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Cold Atom Physics and Bose-Einstein Condensates
Charles University
2014-2024
University College London
2017
Instituto de Física Corpuscular
2011-2014
Universitat de València
2011-2014
Czech Technical University in Prague
2014
Consejo Superior de Investigaciones Científicas
2012
KTH Royal Institute of Technology
2009-2011
AlbaNova
2009-2011
Scuola Internazionale Superiore di Studi Avanzati
2004-2011
University of Trieste
2004-2011
We propose a new seesaw mechanism for neutrino masses within class of supersymmetric SO(10) models with broken D parity. It is shown that in such scenarios the B-L scale can be as low TeV without generating inconsistencies gauge coupling unification nor required magnitude light masses. This leads to possibly neutral boson well relatively quasi-Dirac heavy leptons. These particles could at and mediate lepton flavor CP violating processes appreciable levels.
We present a model of quark and lepton masses mixings based on A4 family symmetry, discrete subgroup an SO(3) flavour together with Pati-Salam unification. It accommodates tri-bimaximal neutrino mixing via constrained sequential dominance particularly simple vacuum alignment mechanism emerging through the effective D-term contributions to scalar potential.
We present a detailed study of the quark and lepton mass spectra in SO(10) framework with one 10_H \bar{126}_H Higgs representations Yukawa sector. consider full generality interplay between type-I type-II seesaws for neutrino masses. first perform \chi^2 fit fermion masses independent on structure GUT potential determine regions parameter space that are preferred by sum rules. then apply our to case minimal renormalizable SUSY 10_H, \bar{126}_H, 126_H, 210_H representations. By requiring...
The constraints of gauge unification on intermediate mass scales in non-supersymmetric SO(10) scenarios are systematically discussed. With respect to the existing reference studies we include U(1) mixing renormalization at one- and two-loop level, reassess beta-coefficients. We evaluate effects additional Higgs multiplets required stages by a realistic spectrum, update discussion present day data. On basis obtained results, breaking patterns with up two discussed for potential relevance...
We propose a simplified version of the inverse seesaw model, in which only two pairs gauge-singlet neutrinos are introduced, to interpret observed neutrino mass hierarchy and lepton flavor mixing at or below TeV scale. This minimal scenario (MISS) is technically natural experimentally testable. In particular, we show that effective parameters describing non-unitary matrix strongly correlated MISS, thus, their upper bounds can be constrained by current experimental data more restrictive way....
The anomalies in the $B$-meson sector, particular $R_{K^{(*)}}$ and $R_{D^{(*)}}$, are often interpreted as hints for physics beyond Standard Model. To this end, leptoquarks or a heavy $Z'$ represent most popular SM extensions which can explain observations. However, adding these fields by hand is not very satisfactory it does address big questions like possible embedding into unified gauge theory. On other hand, light within framework challenging due to additional constraints such lepton...
A predictive framework for fermion masses and mixing is given by the supersymmetric SO(10) model with one ${10}_{H}$, ${\overline{126}}_{H}$, ${126}_{H}$, ${210}_{H}$ Higgs representations, type-II seesaw dominating neutrino mass matrix. We investigate origin of tension between this lepton data refine previous numerical analyses. discuss an extension minimal that includes ${120}_{H}$ chiral superfield representation. This exhausts possible renormalizable contributions to Yukawa sector. In...
We analyze the structure of non-unitary leptonic mixing matrix in inverse seesaw model with heavy singlets accessible at LHC. In this model, unlike usual TeV scenarios, thelow-scale right-handed neutrinos do not suffer from naturalness issues. Underlying correlations among various parameters governing non-unitarity effects are established, which leads to a considerable improvement generic bounds. view this, we study discovery potential future experiments, focusing on sensitivity limits...
We study a class of nonsupersymmetric $SO(10)$ grand-unified scenarios where the first stage symmetry breaking is driven by vacuum expectation values 45-dimensional adjoint representation. Three-decade-old results claim that such Higgs setting may lead exclusively to flipped $SU(5)\ensuremath{\bigotimes}U(1)$ intermediate stage. show this conclusion actually an artifact tree-level potential. The accidental global symmetries emerging in various limits scalar potential offers simple...
Abstract Baryon number conservation is not guaranteed by any fundamental symmetry within the standard model, and therefore has been a subject of experimental theoretical scrutiny for decades. So far, no evidence baryon violation observed. Large underground detectors have long used both neutrino detection searches violating processes. The next generation large will seek to improve upon limits set past current experiments cover range lifetimes predicted several Grand Unified Theories. In this...
We investigate the role of $CP$ phases within renormalizable SUSY $SO(10)$ GUT with one ${10}_{H}$, ${\overline{126}}_{H}$ ${126}_{H}$ and ${210}_{H}$ Higgs representations type II seesaw dominating neutrino mass matrix. This framework is non trivially predictive in fermionic sector connects a natural way unification $b$ $\ensuremath{\tau}$ Yukawa couplings bi-large mixing scenario for neutrinos. On other hand, existing numerical analysis claim that consistency quark charged lepton data...
Simple $SO(10)$ Higgs models with the adjoint representation triggering grand unified symmetry breaking, discarded long ago due to inherent tree-level tachyonic instabilities in physically interesting scenarios, have been recently brought back life by quantum effects. In this work we focus on variant ${45}_{H}\ensuremath{\bigoplus}{126}_{H}$ sector and show that there are several regions parameter space of model can support stable unifying configurations $B\ensuremath{-}L$-breaking scale as...
We analyze the relation between present (and foreseen) bounds on matter stability and presence of TeV-scale color octet scalar states in nonsupersymmetric SO(10) grand unification with one adjoint Higgs representation triggering symmetry breaking. This scenario, discarded long ago due to tree-level tachyonic instabilities appearing all phenomenologically viable breaking patterns, has been recently revived at quantum level. By including relevant two-loop corrections we find a tight...
We investigate nonstandard neutrino interactions (NSIs) in the triplet seesaw model featuring nontrivial correlations between NSI parameters and masses mixing parameters. show that sizable NSIs can be generated as a consequence of nearly degenerate mass spectrum. Thus, these could lead to quite significant signals lepton flavor violating decays such...
We construct a comprehensive list of non-supersymmetric standard model extensions with low-scale LR-symmetric intermediate stage that may be obtained as simple low-energy effective theories within class renormalizable $SO(10)$ GUTs. Unlike the traditional "minimal" LR models many our example settings support perfect gauge coupling unification even if scale is in LHC domain at price only (a few copies of) one or two types extra fields pulled down to TeV-scale ballpark. discuss main aspects...
We survey a few minimal scalar extensions of the standard electroweak model that provide simple setup for massive neutrinos in connection with an invisible axion. The presence chiral $U(1)$ \`a la Peccei-Quinn drives pattern Majorana neutrino masses while providing dynamical solution to strong $CP$ problem and axion as dark matter candidate. paradigmatically apply such renormalizable framework type-II seesaw two viable models oscillations where arise at one loops, respectively. comment on...
We investigate the theoretical stability of predictions tri-bimaximal neutrino mixing with respect to third family wave-function corrections. Such corrections can arise from either canonical normalisation kinetic terms or renormalisation group running effects. At leading order both sorts be subsumed into a single universal parameter. For hierarchical neutrinos, this leads new testable lepton sum rule s=rcosδ+23a (where s,r,a describe deviations solar, reactor and atmospheric angles their...