A5026344887- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Noncommutative and Quantum Gravity Theories
- Advanced NMR Techniques and Applications
- Advanced Mathematical Physics Problems
- Particle Detector Development and Performance
- Lanthanide and Transition Metal Complexes
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Computational Physics and Python Applications
- Advanced Thermodynamics and Statistical Mechanics
- Scientific Research and Discoveries
- Lung Cancer Research Studies
- Magnetism in coordination complexes
- nanoparticles nucleation surface interactions
- Intermetallics and Advanced Alloy Properties
- Superconducting Materials and Applications
- Crystal structures of chemical compounds
- Quantum Electrodynamics and Casimir Effect
Jožef Stefan Institute
2014-2024
University of Ljubljana
1993-2014
New York University
2000-2001
The Abdus Salam International Centre for Theoretical Physics (ICTP)
1996-2001
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2001
Durham University
1997-1998
Carnegie Mellon University
1996
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 study the second and third generation masses in context of minimal renormalizable SO(10) theory. show that if seesaw takes noncanonical (type II) form, large atmospheric neutrino mixing angle requires b-tau unification.
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 discuss in detail the symmetry breaking and related issues minimal renormalizable supersymmetric grand unified theory. compute particle spectrum study its impact on physical scales of This provides a framework for analysis phenomenological implications theory, to be carried out part II.
We systematically study proton decay in the minimal supersymmetric SU(5) grand unified theory. find that although available parameter space of soft masses and mixings is quite constrained, theory still accord with experiment.
The minimal SU(5) theory augmented by the fermionic adjoint representation restores coupling constant unification and gives realistic neutrino masses mixing through hybrid Type I III seesaw. crucial prediction of is an SU(2) lepton triplet with mass below TeV. We study signature these heavy leptons propose strategy to test this mechanism at hadron colliders. smoking gun evidence Delta L=2 number violation events a pair like-sign plus four jets without significant missing energy find that via...
We discuss the ordinary, non-supersymmetric SO(10) as a theory of fermion masses and mixings. construct two minimal versions Yukawa sector based on $\bar{126}_H $ either $10_H$ or $120_H$. The latter case is particular interest since it connects absolute neutrino mass scale with size atmospheric mixing angle $\theta_A$. It also relates smallness $V_{cb}$ largeness These results are analytic study second third generations. Furthermore, we structure light Higgs role Peccei-Quinn symmetry for...
Phenomenologically appealing supersymmetric grand unified theories have large gauge representations and thus are not asymptotically free. Their ultraviolet validity is limited by the appearance of a Landau pole well before Planck scale. One could hope that these save themselves, inclusion gravity, generating an interacting fixed point, similar to one recently discovered in non-supersymmetric gauge-Yukawa theories. Employing a-maximization, a-theorem, unitarity bounds, as positivity other...
We study the nature of seesaw mechanism in context renormalizable SO(10) with Higgs fields 10-plets and $\overline{126}$-plet representations, paying special attention to supersymmetric case. discuss analytically situation for second third generations fermions ignoring any $CP$ violating phase. It is shown that $b\ensuremath{-}\ensuremath{\tau}$ unification large atmospheric mixing angle strongly disfavor dominance type I seesaw.
A bstract We propose a non-supersymmetric E 6 GUT with the scalar sector consisting of 650 ⨁ 351 ′ 27 . Making use first representation for initial symmetry breaking to an intermediate stage, and latter two representations second-stage Standard Model realistic Yukawa sector, this theory represents minimal that proceeds through one stages are novel compared SU(5) or SO(10) GUT: trinification SU(3) C × L R , SU(6) SU(2) flipped U(1). analyze these possibilities under choice vacuum preserves ℤ...
We show that in SO(10) models, a Yukawa sector consisting of real 10H, 120H and complex 126H Higgs fields can provide realistic fit to all fermion masses mixings, including the neutrino sector. Although group theory demands 10H be real, most constructions complexify these impose symmetries exterior achieve predictivity. The proposed new framework with relies only on gauge symmetry, yet has limited number parameters. Our analysis shows while there are restrictions observables, good entire...
We show that by adding a vector-like 5+5bar pair of matter fields to the spectrum minimal renormalizable SUSY SU(5) theory wrong relations for fermion masses can be corrected, while being predictive and consistent with proton lifetime limits. Threshold correction from improves unification gauge couplings compared model. It is found supersymmetric spectra lighter than 3 TeV, which would testable at LHC, least some nucleon decay modes should have partial lifetimes shorter about 2.10^34 yrs.,...
We calculate the high and low scale threshold corrections to D=6 proton decay mode in supersymmetric SU(5) grand unified theories with higher-dimensional representation Higgs multiplets. In particular, we focus on a missing-partner model which group is spontaneously broken by 75-dimensional multiplet doublet–triplet splitting problem solved. find that rate gets suppressed about 60%, mainly due effect at GUT scale, while SUSY-scale are found be less prominent when sfermions heavy.
We show explicitly that supersymmetric E 6 Grand Unified Theory with a Higgs sector consisting of $$ \left\{27 + \overline{27} {351}^{\prime } {\overline{351}}^{\prime 78\right\} fields provides realistic scenario for symmetry breaking and fermion mass generation. While gauge can be achieved without the 78 field, its presence is critical successful doublet-triplet splitting. The Yukawa model consists only two symmetric matrices describing all quark, lepton neutrino masses mixings. are...
We present a new class of unified models based on $SO(10)$ symmetry which provides insights into the masses and mixings quarks leptons, including neutrinos. The key feature our proposal is absence Higgs boson $1{0}_{H}$ belonging to fundamental representation that normally employed. Flavor mixing induced via vectorlike fermions in $16+\overline{16}$ representation. A variety scenarios, both supersymmetric otherwise, are analyzed involving ${\overline{126}}_{H}$ along with either $4{5}_{H}$...