A5082153037- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Medical Imaging Techniques and Applications
- Radiomics and Machine Learning in Medical Imaging
- Quantum Computing Algorithms and Architecture
- Fractal and DNA sequence analysis
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
University of Southern Denmark
2015-2024
Aarhus University
2018-2019
Swedish Chemicals Agency
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2017
European Organization for Nuclear Research
2017
Technical University of Munich
2013-2015
Institute for Advanced Study
2015
University of Lisbon
2011-2013
Instituto Superior Técnico
2011-2013
Instituto Politécnico de Lisboa
2012-2013
We examine the theoretical motivations for long-lived particle (LLP) signals at LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are common prediction wide range theories that address unsolved fundamental mysteries such as naturalness, dark matter, baryogenesis and neutrino masses, represent natural generic possibility physics beyond SM (BSM). In most cases LLP lifetime can be treated free parameter from $\mu$m scale up to Big Bang Nucleosynthesis limit $\sim 10^7$m....
We study a type I see-saw scenario where the right-handed (RH) neutrinos, responsible for light neutrino mass generation, lie at electroweak scale. Under certain conditions, strength of charged and neutral current weak interactions Standard Model particles with heavy RH neutrinos can be large enough to allow their production LHC, opening also possibility observing other low energy signatures new physics in precision observables as well searches rare leptonic decays or neutrinoless double...
The focus of this paper lies on the possible experimental tests leptogenesis scenarios. We consider both generated from oscillations, as well out-of-equilibrium decays. As Akhmedov–Rubakov–Smirnov (ARS) mechanism allows for heavy neutrinos in GeV range, opens up a plethora tests, e.g. at neutrino oscillation experiments, neutrinoless double beta decay, and direct searches neutral leptons future facilities. In contrast, testing decays is quite difficult task. comment necessary conditions...
We perform a detailed study of lepton mixing patterns arising from scenario with three Majorana neutrinos in which discrete flavor group Gf=Δ(3n2) or Gf=Δ(6n2) and CP symmetry are broken to residual symmetries Ge=Z3 Gν=Z2×CP the charged neutrino sectors, respectively. While we consider all possible Z3 Z2 generating elements, focus on certain set transformations. The resulting depends theoretical indices one continuous parameter. In order comprehensively for admitted Ge Gν, it is sufficient...
We analyse the signatures at Large Hadron Collider (LHC) of scotogenic model, when lightest Z 2-odd particle is a singlet fermion and feebly interacting massive (FIMP). further assume that constitutes dark matter it produced in early Universe via freeze-in mechanism. The small couplings required to reproduce observed abundance translate into decay-lengths for next-to-lightest which can be macroscopic, potentially leading spectacular LHC. characterize possible signals model according spectrum...
We perform a detailed analysis of the one-loop corrections to light neutrino mass matrix within low scale type I seesaw extensions Standard Model and their implications in experimental searches for neutrinoless double beta decay. show that sizable contribution effective Majorana from exchange heavy neutrinos is always possible, provided one requires fine-tuned cancellation between tree-level masses. quantify level fine-tuning as function parameters introduce generalisation Casas-Ibarra...
ATLAS and CMS observe deviations from the expected background in diphoton invariant mass searches of new resonances around 750 GeV. We show that a simple realization terms pseudoscalar state can accommodate observations. The model leads to further footprints be soon observed. interpreted both as an axion or {highly natural} composite arising minimal models dynamical electroweak symmetry breaking. how disentangle two scenarios. Beyond possible explanation excess results it is directly test...
The scotogenic model is one of the simplest scenarios for physics beyond Standard Model that can account neutrino masses and dark matter at TeV scale. It contains another scalar doublet three additional singlet fermions (Ni), all odd under a Z2 symmetry. In this paper, we examine possibility candidate, N1, does not reach thermal equilibrium in early Universe so it behaves as Feebly Interacting Massive Particle (FIMP). case, found freeze-in production entirely dominated by decays scalars. We...
We perform a comprehensive analysis of the phenomenology leptonic low and high energy CP phases in scenario with three heavy right-handed neutrinos which flavor symmetry are non-trivially broken. All as well lepton mixing angles determined by properties one free real parameter. focus on generation baryon asymmetry YB Universe via unflavored leptogenesis predictions mee, quantity measurable neutrinoless double beta decay. show that sign can be fixed allowed parameter range mee strongly...
A bstract We study a simple extension of the Standard Model that accounts for neutrino masses and dark matter. The is augmented by two Higgs doublets one Dirac singlet fermion, all charged under new global symmetry. It generalised version Scotogenic with fermion Masses neutrinos are generated radiatively at one-loop level. case where constitutes matter Universe. in depth phenomenology model, particular complementarity between direct detection lepton flavour violation observables. Due to...
Many new physics models contain particles that interact with the Higgs boson. These could be produced at LHC via gluon-gluon fusion an off-shell and, if charged under a gauge group, also $Z$ boson and Drell-Yan process. We consider in this paper simplified scenarios where Standard Model is extended by one scalar or fermionic field interacts boson, we evaluate impact of interaction on production exotic LHC. This analysis applies, particular, to TeV-scale seesaw neutrino mass generation.
We review the current status of data on neutrino masses and lepton mixing prospects for measuring CP-violating phases in sector. The possible connection between low energy CP violation encoded Dirac Majorana Pontecorvo–Maki–Nakagawa–Sakata matrix successful leptogenesis is emphasized context seesaw extensions Standard Model with a flavor symmetry [Formula: see text] (and symmetry).
We provide an asymptotically safe Pati-Salam embedding of the Standard Model. Safety is achieved by adding to theory gauged vector-like fermions and employing recently developed large number-of-flavor techniques results. show that gauge, scalar quartic Yukawa couplings achieve interacting ultraviolet fixed point below Planck scale. The minimal model a relevant example Model extension in which unification all type occurs because dynamical principle, i.e. presence point. This differs from...
The CP-violation necessary for the generation of baryon asymmetry Universe YB in "flavoured" leptogenesis scenario can arise from "low energy" PMNS neutrino mixing matrix U and/or "high part Yukawa couplings, which mediate CP-violating phenomena only at some high energy scale. possible interplay between these two types is analysed. type I see-saw model with three heavy right-handed Majorana neutrinos having hierarchical spectrum considered. We show that case inverted light mass spectrum,...
We study a seesaw-type extension of the standard model in which symmetry group is enlarged by global $U(1)$. introduce adequate scalar and fermion representations naturally explain smallness neutrino masses. With addition viable dark matter candidate, an original scenario leptogenesis emerges. solve relevant set Boltzmann equations show how can be successfully implemented at TeV scale. The constraints on mass spectrum are derived phenomenology discussed.
The stability of the dark matter particle could be attributed to remnant $Z_2$ symmetry that arises from spontaneous breaking a global U(1) symmetry. This plausible scenario contains Goldstone boson which, as recently shown by Weinberg, is strong candidate for radiation. We show in this paper boson, together with CP-even scalar associated symmetry, plays central role production. Besides, mixing Standard Model Higgs leads novel decay channels and interactions nucleons, thus opening...