A5077991518- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- International Science and Diplomacy
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- DNA and Nucleic Acid Chemistry
- Superconducting Materials and Applications
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Radioactive Decay and Measurement Techniques
- Astronomy and Astrophysical Research
- Spacecraft Design and Technology
- Nuclear Physics and Applications
Kogakuin University
2012-2023
The Graduate University for Advanced Studies, SOKENDAI
2015
European Organization for Nuclear Research
2009
Deutsches Elektronen-Synchrotron DESY
2008-2009
Scuola Internazionale Superiore di Studi Avanzati
2005-2008
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2006-2008
Istituto Nazionale di Fisica Nucleare
2006-2007
High Energy Accelerator Research Organization
2005
Osaka University
2001-2004
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 analyse the cosmic-ray signatures of decaying gravitino dark matter in a model-independent way based on an operator analysis. Thermal leptogenesis and universal boundary conditions at GUT scale restrict mass to be below 600 GeV. Electron positron fluxes from decays, together with standard GALPROP background, cannot explain both PAMELA fraction electron + flux recently measured by Fermi LAT. For matter, observed require astrophysical sources. The antiproton allows for sizable contribution...
We discuss an extended scalar model which explains the recent results of diphoton excess at 750 GeV LHC Run II experiments. An additional singlet boson with mass GeV, couples to top quarks via a dimension five operator, is produced gluon fusion and decays into two photons loop contributions number (multiply) charged bosons. Origin such operator would be, for example, in context composite Higgs models. The can be explained without contradicting data from I also theoretical consistencies as...
The Proceedings of the 2003 SLAC Workshops on flavor physics with a high luminosity asymmetric e+e- collider. sensitivity to beyond Standard Model is addressed in detail, context improvement experimental measurements and theoretical calculations.
We discuss possibility of direct search for lepton flavor violation (LFV) in Yukawa interaction by measuring the branching ratio decay lightest Higgs boson (h0) into a τ–μ pair at linear collider (LC). study significance signal process, e+e−→Z*→Zh0→Zτ±μ∓, against backgrounds such as e+e−→Zτ+τ−→Zτ±μ∓+ missings. After taking appropriate kinematic cuts, number background event is considerably reduced, so that can be visible when h0→τ±μ∓ larger than about 10−4. In minimal supersymmetric Standard...
In the composite Higgs models, originally proposed by Georgi and Kaplan, boson is a pseudo Nambu-Goldstone (pNGB) of spontaneous breaking global symmetry. minimal version such SO(5) symmetry spontaneously broken to SO(4), pNGBs form an isospin doublet field, which corresponds in Standard Model (SM). Predicted coupling constants can general deviate from SM predictions, depending on compositeness parameter. The deviation pattern determined also detail matter sector. We comprehensively study...
Quark and lepton flavor signals are studied in four supersymmetric models, namely, the minimal supergravity model, standard model with right-handed neutrinos, SU(5) grand unified theory U(2) symmetry. We calculate $b\ensuremath{\rightarrow}s(d)$ transition observables ${B}_{d}$ ${B}_{s}$ decays, taking constraint from ${B}_{s}\ensuremath{-}{\overline{B}}_{s}$ mixing recently observed at Tevatron into account. also violating processes...
Direct $CP$ asymmetries (${\mathcal{A}}_{CP}$) in the inclusive decays of $\overline{B}\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma}$ and $\overline{B}\ensuremath{\rightarrow}{X}_{s+d}\ensuremath{\gamma}$ order 1% will be probed at BELLE II experiment. In this work, three such are studied context a three-Higgs-doublet model (3HDM), it is shown that all ${\mathcal{A}}_{CP}$ can as large current experimental limits. Of particular interest for...
We analyze the dependence of rates LFV charged-lepton decays $\ensuremath{\mu}\ensuremath{\rightarrow}e+\ensuremath{\gamma}$, $\ensuremath{\tau}\ensuremath{\rightarrow}e+\ensuremath{\gamma}$, $\ensuremath{\tau}\ensuremath{\rightarrow}\ensuremath{\mu}+\ensuremath{\gamma}$ (${l}_{i}\ensuremath{\rightarrow}{l}_{j}+\ensuremath{\gamma}$) and their ratios, predicted in class SUSY theories with see-saw mechanism $\ensuremath{\nu}$-mass generation soft breaking universal boundary conditions at GUT...
We propose a simple model to explain neutrino mass, dark matter and baryogenesis based on the extended Higgs sector which appears in low-energy effective theory of supersymmetric gauge with confinement. here consider SU(2)$_H$ symmetry three flavours fundamental representations are charged under standard SU(3)$_C\times$ SU(2)$_L\times$U(1)$_Y$ new discrete $Z_2$ symmetry. also introduce $Z_2$-odd right-handed superfields addition superfields. The below confinement scale contains fifteen...
We introduce a three-Higgs doublet model (3HDM) with two inert (or dark) scalar doublets and an active Higgs one, hence termed $\mathrm{I}(2+1)\mathrm{HDM}$, in the presence of discrete ${Z}_{3}$ symmetry acting upon three fields. show that such construct yields dark matter (DM) sector mass-degenerate states opposite $CP$ quantum number, both which contribute to DM dynamics, we call ``hermaphrodite DM,'' distinguishable from (single) complex candidate. relic density contributions are equal,...
Composite Higgs models are intriguing scenarios in which the particle is identified as a pseudo-Nambu--Goldstone boson associated with spontaneous breaking of some global symmetry above electroweak scale. They would predict new resonances at high-energy scales, can appear multi-TeV scales. In such case, analogies pion physics QCD, where sizable phase shift predicted pion-pion scattering processes, might help us to evaluate scales resonances. this paper, we discuss two complementary...
We discuss whether bimaximal mixing given at the grand unified theory scale is consistent with solar normal side low energy. consider radiative corrections due to $\ensuremath{\tau}$-Yukawa, neutrino-Yukawa, and slepton threshold in what situation maximal angle rotates toward side. In this scheme, $|{V}_{13}|$ Dirac CP phase $\ensuremath{\delta}$ are induced radiatively, we estimate these values.
We study effects of supersymmetric particles in various rare B decay processes as well the unitarity triangle analysis. consider three different models, minimal supergravity, $\mathrm{SU}(5)$ SUSY GUT with right-handed neutrinos, and standard model $U(2)$ flavor symmetry. In we two cases mass matrix neutrinos. calculate direct mixing-induced CP asymmetries $\stackrel{\ensuremath{\rightarrow}}{b}s\ensuremath{\gamma}$ asymmetry ${B}_{d}\ensuremath{\rightarrow}\ensuremath{\varphi}{K}_{S}$...
We discuss the neutrino mass matrix which predicts zero or small values of |V_{13}| in MSSM and found inequality, sin^2 2theta_{12} <= 2theta_sol, where is mixing angle at M_R scale 2theta_{sol} value determined by solar oscillation. This constraint says that model a larger tan^2 theta_{sol} than experimental excluded. In particular, bi-maximal scheme excluded, from theta_sol<1. this model, Dirac phase m_Z are induced radiatively turn out to be not small. The effective <m_nu> expected order 0.05 eV.
We study the lepton flavor violation in supersymmetric seesaw model, taking into account recent experimental improvements, especially for Higgs boson mass measurement, direct searches of superpartners, and rare decay ${B}_{s}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ at LHC; neutrino mixing angle ${\ensuremath{\theta}}_{13}$ experiments; search $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$ MEG experiment. obtain latest constraints on...
We study a realistic SU(5) grand unified model, where $\mathbf{45}$ representation of scalar fields is added to the Georgi-Glashow model in order realize gauge coupling unification and masses mixing quarks leptons. The together with constraints from proton decay implies mass splittings representations. assume that an SU(2) triplet component scalar, which called ${S}_{3}$ leptoquark, has TeV-scale mass, color-sextet color-octet ones have ${10}^{6}\text{ }\text{ }\mathrm{GeV}$. calculate...
We discuss the energy scale profile of bimaximal mixing which is given at grand unified theory (GUT) in minimal supersymmetry model, associated with an assumption that ${Y}_{\ensuremath{\nu}}^{\ifmmode\dagger\else\textdagger\fi{}}{Y}_{\ensuremath{\nu}}$ diagonal, where ${Y}_{\ensuremath{\nu}}$ neutrino-Yukawa coupling matrix. In this Dirac mass matrix appears seesaw neutrino determined by three masses, two relative Majorana phases and heavy masses. All CP are related phases. show requirement...