A5038240119- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Pulsars and Gravitational Waves Research
- Advanced Thermodynamics and Statistical Mechanics
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Scientific Research and Discoveries
- Fault Detection and Control Systems
- Relativity and Gravitational Theory
- Diverse Musicological Studies
- Medical Imaging Techniques and Applications
- Nuclear reactor physics and engineering
- Galaxies: Formation, Evolution, Phenomena
- Algorithms and Data Compression
- Musicology and Musical Analysis
Tokyo Gakugei University
2013-2024
Institute of High Energy Physics
2013-2024
High Energy Accelerator Research Organization
2022
Austrian Academy of Sciences
1998-2020
University of Vienna
2013-2016
Institute of Nuclear and Particle Physics
2016
National and Kapodistrian University of Athens
2016
Centre National de la Recherche Scientifique
2013-2014
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2013-2014
University of Würzburg
2013
The TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider
We improve the calculation of supersymmetric $\mathcal{O}({\ensuremath{\alpha}}_{s})$ QCD corrections to decays Higgs bosons into quarks and squarks in minimal standard model. In on-shell renormalization scheme these can be very large, which makes perturbative expansion unreliable. This is especially serious for bottom large $\mathrm{tan}\ensuremath{\beta}.$ Their corrected widths even become negative. show that this problem solved by a careful choice tree-level boson couplings squarks,...
We calculate the gravitino production rate, computing its one-loop thermal self-energy. Gravitino processes that do not result through cuts of self-energy, have been identified and taken into account. Correcting analytical errors numerical approximations in previous calculations, we present our result. This deviates from latest estimation by almost 10%. More importantly, provide a convenient formula, for calculating rate abundance, as function reheating temperature Universe.
Abstract We present a full one-loop calculation of the gravitino thermal production rate, beyond so-called hard loop approximation, using corresponding spectral functions in numerical form on both sides light cone. This framework requires evaluation. interpret our results within general supergravity-based model, remaining agnostic about specifics supersymmetry breaking. In this context, assuming that gravitinos constitute entirety dark matter Universe imposes strict constraints reheating...
We present a consistent procedure for the calculation of one-loop corrections to charginos and neutralinos by using their on-shell mass matrices. The gaugino parameters M M', Higgsino parameter \mu are defined elements these matrices different finite from tree-level ones given in terms parameters. When determined chargino sector, neutralino masses receive up 4%. This must be taken into account precision measurements at future e^+ e^- linear colliders.
We present a high precision calculation of chargino and neutralino pair production at ${e}^{+}{e}^{\ensuremath{-}}$ colliders. Within the minimal supersymmetric standard model, full one-loop higher order QED corrections are included. Special care has been taken in definition Lagrangian input parameters. Furthermore, proper inclusion separation weak discussed. show numerical results for total cross sections, as well forward-backward left-right asymmetries SPS1a' scenario proposed SPA...
We calculate the order(\alpha_s) SUSY-QCD corrections to widths of stop and sbottom decays into Higgs bosons within Minimal Supersymmetric Standard Model. give complete analytical formulae paying particular attention on-shell renormalization soft SUSY-breaking parameters. also perform a detailed numerical analysis both all h^0, H^0, A^0, H^\pm. find that are significant, mostly negative order few ten percent.
We study the effect of squark generation mixing on production and decays at LHC in Minimal Supersymmetric Standard Model (MSSM). show that can be very large despite strong constraints quark-flavour violation (QFV) from experimental data B mesons. find two lightest up-type squarks u˜1,2 have branching ratios for into cχ˜10 tχ˜10 same time due to mixing, leading QFV signals ‘pp→ct¯(tc¯)+missing-ET+X’ with a significant rate. The observation this remarkable signature would provide powerful test...
We compute the decay width of ${h}^{0}\ensuremath{\rightarrow}c\overline{c}$ in minimal supersymmetric Standard Model with quark flavor violation (QFV) at full one-loop level adopting $\overline{\mathrm{DR}}$ renormalization scheme. study effects $\stackrel{\texttildelow{}}{c}\ensuremath{-}\stackrel{\texttildelow{}}{t}$ mixing, taking into account constraints from B meson data. show that corrected $\mathrm{\ensuremath{\Gamma}}({h}^{0}\ensuremath{\rightarrow}c\overline{c})$ is very sensitive...
We study the effect of squark generation mixing on gluino production and decays at LHC in Minimal Supersymmetric Standard Model (MSSM) for case that is lighter than all squarks dominantly into three particles, $gl -> q qbar neut_k, gl qbar' char_l$. assume between second third generations up-type down-type sectors. show this can lead to very large branching ratios quark-flavour violating three-body despite strong constraints violation (QFV) from experimental data B mesons. also QFV decay are...
We study quark flavour violation (QFV) in the squark sector of Minimal Supersymmetric Standard Model (MSSM). assume mixing between second and third generations, i.e. sc_R-st_{L,R} mixing. focus on QFV effects bosonic decays, particular decay into lightest Higgs boson h0, su_2 -> su_1 where su_{1,2} are up-type squarks. show that branching ratio this can be quite large (up to 50 %) due trilinear couplings, sc_R-st_{L, R} st_L-st_R mixing, despite strong constraints from B meson data. This...