A5102945816- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Noncommutative and Quantum Gravity Theories
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- International Science and Diplomacy
- Advanced Algebra and Geometry
- Earth Systems and Cosmic Evolution
- Quantum Mechanics and Applications
- Biofield Effects and Biophysics
- Distributed and Parallel Computing Systems
- Scientific Research and Discoveries
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Neuroendocrine Tumor Research Advances
- Wireless Power Transfer Systems
The Abdus Salam International Centre for Theoretical Physics (ICTP)
2015-2025
Ludwig-Maximilians-Universität München
2021-2024
International Centre for Theoretical Sciences
2011-2024
Shanghai Jiao Tong University
2020-2023
Gran Sasso Science Institute
2015-2017
Istituto Nazionale di Fisica Nucleare
2016
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2001
New York University
2001
Panjab University
1998
Jožef Stefan Institute
1997
In weak-interaction models with spontaneous parity nonconservation, based on the gauge group $\mathrm{SU}{(2)}_{L}\ensuremath{\bigotimes}\mathrm{SU}{(2)}_{R}\ensuremath{\bigotimes}\mathrm{U}(1)$, we obtain following formula for neutrino mass: ${m}_{{\ensuremath{\nu}}_{e}}\ensuremath{\simeq}\frac{{{m}_{e}}^{2}}{g{m}_{{W}_{R}}}$, where ${W}_{R}$ is boson which mediates right-handed weak interactions. This formula, valid each lepton generation, relates maximality of observed nonconservation at...
Unified electroweak gauge theories based on the group $\mathrm{SU}{(2)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}{(2)}_{R}\ifmmode\times\else\texttimes\fi{}\mathrm{U}{(1)}_{B\ensuremath{-}L}$, in which breakdown of parity invariance is spontaneous, lead most naturally to a massive neutrino. Assuming neutrino be Majorana particle, we show that smallness its mass can understood as result observed maximality violation low-energy weak interactions. This shown independent number...
Left-right-symmetric gauge models suggested previously to describe all interactions of elementary particles within a single unified framework are further shown have the desirable property that maximal parity violation in low-energy weak processes arises purely as result spontaneous breakdown local symmetry. We also discuss question dynamical origin violation.
This paper describes the physics case for a new fixed target facility at CERN SPS. The SHiP (Search Hidden Particles) experiment is intended to hunt in largely unexplored domain of very weakly interacting particles with masses below Fermi scale, inaccessible LHC experiments, and study tau neutrino physics. same proton beam setup can be used later look decays tau-leptons lepton flavour number non-conservation, $\tau\to 3\mu$ search weakly-interacting sub-GeV dark matter candidates. We discuss...
A possibility of a very clean signature for the production ${{W}_{R}}^{\ifmmode\pm\else\textpm\fi{}}$ is pointed out. If right-handed neutrino lighter than ${{W}_{R}}^{\ifmmode\pm\else\textpm\fi{}}$, left-right symmetric gauge theory predicts decay ${{W}_{R}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{+}+2$ hadronic jets, with branching ratio \ensuremath{\sim}3%. The lack neutrinos in final state and absence sizable background make rather easy to detect (if it...
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,...
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...
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.
The minimal <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>S</a:mi><a:mi>O</a:mi><a:mo stretchy="false">(</a:mo><a:mn>10</a:mn><a:mo stretchy="false">)</a:mo></a:math> grand unified theory, augmented by higher-dimensional operators, is based on the following Higgs representations: adjoint <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mn>4</e:mn><e:msub><e:mn>5</e:mn><e:mi mathvariant="normal">H</e:mi></e:msub></e:math>, spinor <h:math...
Renormalization effects are analyzed for a class of supersymmetric grand unified theories which contain the standard $\mathrm{SU}{(3)}_{c}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}{(2)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{U}(1)$ model. Predictions ${{sin}^{2}\stackrel{^}{\ensuremath{\theta}}}_{W}({m}_{W})$ and proton lifetime obtained as functions ${\ensuremath{\Lambda}}_{\stackrel{-}{\mathrm{MS}}}$ ($\stackrel{-}{\mathrm{MS}}$ is modified minimal-subtraction scheme), ${N}_{H}$...
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.
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 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 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 study the temperature dependence of soft $\mathrm{CP}$-invariance violation in a class gauge theories based on group $\mathrm{SU}{(2)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{U}(1)$ and show that there exist physically acceptable domains coupling parameters theory where persists at high temperatures. Such models have potential to explain matter-antimatter asymmetry universe while same time providing cure for strong $\mathrm{CP}$ problem.
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...
We give exact formulas for the right-handed analog of CKM matrix in minimal Left-Right symmetric theory, case when symmetry is generalized Parity as original version theory. derive its explicit form and a physical reason known surprising fact that mixing angles are close value to ones, spite being badly broken nature. exemplify our results on production charged gauge boson computation neutral K meson mass difference.