A5032380960- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Quantum Electrodynamics and Casimir Effect
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Quantum, superfluid, helium dynamics
- Radioactive Decay and Measurement Techniques
- Twentieth Century Scientific Developments
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Mechanics and Applications
- Numerical methods for differential equations
- Matrix Theory and Algorithms
- Astronomy and Astrophysical Research
- GNSS positioning and interference
- Parallel Computing and Optimization Techniques
Jožef Stefan Institute
2015-2025
University of Ljubljana
2022-2025
University of Zurich
2015
Universität Hamburg
2009-2014
Scuola Internazionale Superiore di Studi Avanzati
2014
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2014
The Abdus Salam International Centre for Theoretical Physics (ICTP)
2011-2013
International Centre for Theoretical Sciences
2013
We revisit the issue of limit on scale Left-Right symmetry breaking. focus minimal SU(2)_L x SU(2)_R U(1)_B-L gauge theory with seesaw mechanism and discuss two possibilities defining as parity or charge conjugation. In commonly adopted case parity, we perform a complete numerical study quark mass matrices associated left right mixing without any assumptions usually made in literature about ratio vacuum expectation values. find that usual lower right-handed boson from K difference,...
The Large Hadron Collider has a potential to probe the scale of left-right symmetry restoration and associated lepton number violation. Moreover, it offers hope measuring right-handed leptonic mixing matrix. We show how this, together with constraints from flavor violating processes, can be used make predictions for neutrinoless double beta decay. illustrate this deep connection in case type-II seesaw.
Abstract The existence of nonzero neutrino masses points to the likely multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, referred as leptons (HNLs). In this white paper, we discuss present experimental status HNLs including colliders, beta decay, accelerators, well astrophysical and cosmological impacts. We importance continuing search for HNLs, its potential impact on our understanding key fundamental questions,...
In this article, we revisit the Type II seesaw mechanism based on addition of a weak triplet scalar to standard model. We perform comprehensive study its phenomenology at LHC energies, complete with electroweak precision constraints. pay special attention doubly-charged component, object collider searches for long time, and show how experimental bound mass depends crucially particle spectrum theory. Our can be used as roadmap future studies.
We investigate the viability of having dark matter in minimal left-right symmetric theory. find lightest right-handed neutrino with a mass around keV as only viable candidate consistent TeV scale symmetry. In order to account for correct relic density such low scales, thermal overproduction early universe is compensated by sufficient late entropy production due decay heavier neutrinos. point out that presence charge-current interactions, operative QCD phase transition, has crucial impact on...
We have recently proposed a simple SU(5) theory with an adjoint fermionic multiplet on top of the usual minimal spectrum. This leads to hybrid scenario both type I and III seesaw it predicts existence SU(2) triplet between 100 GeV 1 TeV for conventional grand unified scale about ${10}^{16}\text{ }\text{ }\mathrm{GeV}$, main decays into $W$ ($Z$) leptons, correlated through Dirac Yukawa couplings, lifetimes shorter than ${10}^{\ensuremath{-}12}\mathrm{sec}$. These are lepton number violating...
We use the early Large Hadron Collider data to set lower limit on scale of left-right symmetry, by searching for right-handed charged gauge boson ${W}_{R}$ via final state with two leptons and jets, $33\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ integrated luminosity 7 TeV center-of-mass energy. This signal is kinematically observable neutrino lighter than ${W}_{R}$. In absence a beyond standard model background, we bound ${M}_{{W}_{R}}\ensuremath{\gtrsim}1.4\text{ }\mathrm{TeV}$ at 95%...
Probing the origin of neutrino mass by disentangling seesaw mechanism is one central issues particle physics. We address it in minimal left-right symmetric model and show how knowledge light heavy masses mixings suffices to determine their Dirac Yukawa couplings. This turn allows make predictions for a number high low energy phenomena, such as decays neutrinos, neutrinoless double beta decay, electric dipole moments charged leptons transition moments. also discuss way reconstructing...
In the context of left-right symmetry, we revisit Keung-Senjanovi\ifmmode \acute{c}\else \'{c}\fi{} production right-handed ${W}_{R}$ bosons and heavy neutrinos $N$ at high energy colliders. We develop a multibinned sensitivity measure use it to estimate for entire range masses, spanning standard merged prompt signals, displaced vertices invisible region. The estimated LHC with 300/fb integrated luminosity ranges from 5 beyond 7 TeV, while future 33(100) TeV collider's reach 3/ab extends 12(26) TeV.
We revisit the decay rate of electroweak vacuum in standard model with full one-loop prefactor. focus on gauge degrees freedom and derive degeneracy factors appearing functional determinant using group theoretical arguments. Our treatment shows that transverse modes were previously overcounted, so we revise calculation part The new result modifies fields’ contribution by 6% slightly decreases predicted lifetime vacuum, which remains much longer than age Universe. discussion mode applies to...
We show that within the left-right symmetric model, lepton number violating decays of Higgs boson can be discovered at LHC. The process is due to mixing with triplet breaks parity. As a result, act as gateway origin heavy Majorana neutrino mass. To assess LHC reach, detailed collider study same-sign dileptons plus jets channel provided. This complementary existing nuclear and searches for violation probe scale parity restoration even beyond other direct searches.
In the minimal left-right model choice of symmetry is twofold: either generalized parity $\mathcal{P}$ or charge conjugation $\mathcal{C}$. with spontaneously broken strict $\mathcal{P}$, a large tree-level contribution to strong $CP$ violation can be computed in terms spontaneous phase $\ensuremath{\alpha}$. Searches for neutron electric dipole moments then constrain size Following latest update on indirect kaon sector, bound ${W}_{R}$ mass at 20 TeV set. Possible ways out this require...
In this paper, we propose a new possible connection between dark matter relic density and baryon asymmetry of the universe. The portal standard model sector not only controls detections matter, but also allows to trigger first order electroweak phase transition. We discuss systematically scalar candidates, starting from real singlet arbitrary high representations. show that simplest realization is provided by doublet, strong first-order transition implies lower bound on direct detection...
Collider signals of heavy Majorana neutrino mass origin are studied in the minimal Left-Right symmetric model, where their is generated spontaneously together with breaking lepton number. The right-handed triplet Higgs boson Δ, responsible for such breaking, can be copiously produced at LHC through portal gluon fusion and less so gauge mediated channels. At Δ masses below opening V decay channel, two observable modes pair-production neutrinos via gg → NN pair production triplets from h ΔΔ 4N...
We present a systematic comparison of doubly charged Higgs boson production mechanisms at hadron colliders in the context Type II Seesaw model, emphasizing importance higher-order corrections and subdominant channels. consider Drell-Yan channel next-to-leading order QCD, photon fusion leading order, gluon with resummation threshold logarithms up to next-to-next-to-next-to-leading logarithmic accuracy, same-sign weak QCD. For processes, we study impact static jet veto matched scale...
The scalar sector of the minimal Left-Right model at TeV scale is revisited in light large quartic coupling needed for a heavy flavor-changing scalar. stability and perturbativity effective potential discussed merged with constraints from low-energy processes. Thus perturbative level sharpened. Lower limits on triplet scalars are also derived: left-handed bounded by oblique parameters, while doubly-charged right-handed component limited $h \to \gamma \gamma, Z \gamma$ decays. Current...
Entropy production is a necessary ingredient for addressing the overpopulation of thermal relics. It widely employed in particle physics models explaining origin dark matter. A long-lived that decays to known particles, while dominating universe, plays role dilutor. We point out impact its partial decay matter on primordial power spectrum. For first time, we derive stringent limit branching ratio dilutor from large scale structure observation using sloan digital sky survey data. This offers...
Temporary matter domination and late entropy dilution, injected by a ``long-lived'' particle in the early Universe, serves as standard mechanism for yielding correct dark relic density. We recently pointed out cosmological significance of diluting particle's partial decay into matter. When repopulated such way, carries higher momentum than its thermal counterpart, resulting suppression linear power spectrum that is constrained large scale structure observations. In this work, we study impact...
We examine the prospect of observing genuine lepton-number-violating (LNV) signals at hadron colliders in context type II seesaw mechanism. The model features smoking gun involving same-sign di-leptons and jets that may be primary observable channel certain regions parameter space. flavor composition final-state charged leptons is related to origin neutrino masses correlated with other rare processes, such as neutrinoless double-beta decay. review existing collider limits provide sensitivity...
A bstract We consider a single real scalar field in flat spacetime with polynomial potential up to ϕ 4 , that has local minimum, the false vacuum, and deeper global true vacuum. When vacua are almost degenerate we thin wall regime, while as their difference energy increases, approach thick regime. give explicit simple formulae for decay rate of vacuum 3 dimensions. Our results include careful treatment both bounce action, which enters at exponent rate, functional determinant one loop,...
We study the production of right-handed $W_R$ bosons and heavy neutrinos $N$ at a future 100 TeV high energy hadron collider in context Left-Right symmetry, including effects $W_L-W_R$ gauge-boson mixing. estimate reach for up to 3/ab integrated luminosity using multi-binned sensitivity measure. In Keung-Senjanovi\'c missing channels, 3$\sigma$ extends $M_{W_R}=35$ 37 TeV, respectively. further clarify interplay between channel (expected) limits from neutrinoless double beta decay searches,...
It was shown recently that mirror fermions, naturally present in a number of directions for new physics, seem to require an inert scalar doublet order pass the electroweak precision tests. This provides further motivation considering as dark matter candidate. Moreover, presence extra families enhances Standard Model Higgs-nucleon coupling, which has crucial impact on Higgs and searches. We study limits mass view recent Xenon100 data. find must lie very narrow window 74-76 GeV while weigh...
We propose a new approach for computing tunneling rates in quantum or thermal field theory with multiple scalar fields. It is based on exact analytical solutions of piecewise linear potentials many segments that describes any given potential to arbitrary precision. The method first developed the single case three and four space-time dimensions demonstrated examples classical as well calculation fluctuations. A systematic expansion beyond order considered, taking into account higher...