A5027782379- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Muon and positron interactions and applications
- Software-Defined Networks and 5G
- MRI in cancer diagnosis
- advanced mathematical theories
- Advanced MRI Techniques and Applications
- IPv6, Mobility, Handover, Networks, Security
- Hepatocellular Carcinoma Treatment and Prognosis
- Network Packet Processing and Optimization
Nagoya University
2012-2017
Obayashi (Japan)
2014-2017
Tohoku University
1995-2009
Michigan State University
2005-2008
University of California, Davis
2002-2004
University of Michigan
2003-2004
European Organization for Nuclear Research
2000-2002
Northwestern University
2000
The Ohio State University
1998-1999
The University of Tokyo
1995-1998
Various lepton-flavor violating (LFV) processes in the supersymmetric standard model with right-handed neutrino supermultiplets are investigated detail. It is shown that large LFV rates obtained when $\tan \beta $ large. In case where mixing matrix lepton sector has a similar structure as Kobayashi-Maskawa and third-generation Yukawa coupling of top quark, branching ratios can be $Br(\mu\rightarrow e\gamma)\simeq 10^{-11}$ $Br(\tau\rightarrow\mu\gamma)\simeq 10^{-7}$, which within reach...
The conclusions of the Physics Working Group international scoping study a future Neutrino Factory and super-beam facility (the ISS) are presented. ISS was carried by community between NuFact05, 7th International Workshop on Factories Superbeams, Laboratori Nazionali di Frascati, Rome, June 21-26, 2005) NuFact06 (Ivine, California, 24{30 August 2006). physics case for an extensive experimental programme to understand properties neutrino is presented role high-precision measurements...
Motivated by an anomaly in R(D(⁎))=BR(B¯→D(⁎)τ−ν¯)/BR(B¯→D(⁎)l−ν¯) reported BaBar, Belle and LHCb, we study R(D(⁎)) a general two Higgs doublet model (2HDM). Although it has been suggested that is difficult for the 2HDM to explain current world average R(D(⁎)), would be important clarify how large deviations from standard predictions are possible 2HDM. We investigate corrections taking into account various flavor physics constraints (such as Bc−→τ−ν¯, b→sγ, b→sl+l−, ΔmBd,s, Bs→μ+μ− τ+τ−,...
A two Higgs doublet model (2HDM) is one of minimal extensions the Standard Model (SM), and it well-known that general setup predicts flavor-violating phenomena, mediated by neutral interactions. Recently CMS collaboration has reported an excess lepton-flavor-violating decay in h → μτ channel with a significance 2.4 σ. We investigate 2HDM tree-level Flavor Changing Neutral Currents (FCNCs), discuss its impact on other physical observations. Especially, we see FCNCs relevant to can enhance...
We systematically construct gauge-mediated supersymmetry- (SUSY-)breaking models with direct transmission of SUSY-breaking effects to the standard-model sector. obtain a natural model gravitino mass ${m}_{3/2}$ smaller than $1 \mathrm{keV}$ as required from standard cosmology. If all Yukawa coupling constants are order one, scale ${m}_{\mathrm{SUSY}}$ transmitted into sector is given by...
In this paper, we consider phenomenology of a model with an $L_\mu-L_\tau$ gauge symmetry. Since the muon couples to boson (called $Z''$ boson), its contribution anomalous magnetic moment (muon g-2) can account for discrepancy between standard prediction and experimental measurements. On other hand, does not interact electron quarks, hence there are no strong constraints from collider experiments even if mass is order electroweak scale. We show allowed region parameter space in symmetric...
We study the collider phenomenology of a littlest Higgs model with T parity. first stress important role T-odd $SU(2)$-doublet fermions (introduced to make T-parity invariant) in high energy scattering processes, such as $q\overline{q}\ensuremath{\rightarrow}{W}_{H}^{+}{W}_{H}^{\ensuremath{-}}$ where ${W}_{H}^{\ifmmode\pm\else\textpm\fi{}}$ are partners $W$ bosons. Because mass cannot be too heavy consistent low data, they can copiously produced at CERN Large Hadron Collider (LHC)....
Motivated by the recent CMS excess in a flavor violating Higgs decay $h \rightarrow \mu \tau$ as well anomaly of muon anomalous magnetic moment (muon g-2), we consider scenario where both and g-2 are explained $\mu-\tau$ violation general two doublet model. We study various processes involving $\mu$ $\tau$, then discuss typical predictions constraints this scenario. Especially, find that prediction $\tau \gamma$ can be within reach Belle II experiment. also show lepton non-universality...
In a previous paper we analyzed fermion masses (focusing on neutrino and mixing angles) in an SO(10) SUSY GUT with U(2)$\timesU(1)^n$ family symmetry. The model is "natural" containing all operators the Lagrangian consistent states their charges. With minimal symmetry breaking vevs also predictive giving unique solution to atmospheric (with maximal $\nu_\mu \to \nu_\tau$ mixing) solar SMA MSW $\nu_e \nu_s$ oscillations. this analyze case of general vevs. We now find several new solutions for...
We analyze in detail lepton-flavor violation (LFV) the charged-lepton sector such as $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}e\ensuremath{\gamma}, \stackrel{\ensuremath{\rightarrow}}{\ensuremath{\tau}}\ensuremath{\mu}\ensuremath{\gamma}, \stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}eee,$ and $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}e$ conversion nuclei, within framework of supersymmetric models with lopsided Froggatt-Nielsen charges, which large mixing...
Supersymmetry with R-parity violation (RPV) provides an interesting framework for naturally accommodating small neutrino masses. Within this framework, we discuss the lepton-flavor violating (LFV) processes $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}e\ensuremath{\gamma},$ $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}eee,$ and $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\mu}}e$ conversion in nuclei. We make a detailed study of observables related to LFV different RPV...
We show that, in the minimal supersymmetric standard model, possibility for lightest $CP$-even Higgs boson to be lighter than $Z$ (as low as about 60 GeV) is, contrary usual belief, not yet excluded by CERN LEP2 search nor any direct searches particles at high energy colliders. The characteristic of light scenario (LHS) is that $ZZh$ coupling and decay branching ratio $\mathrm{Br}(h/A\ensuremath{\rightarrow}b\overline{b})$ are simultaneously suppressed a result generic loop corrections....
In this letter we present a predictive SO(10) SUSY GUT with flavor symmetry U(2) \times U(1) which has several nice features. We are able to fit fermion masses and mixing angles, including recent neutrino data, 9 parameters in the charged sector 4 sector. The plays preeminent role -- (i) model is "natural" include all terms allowed by symmetry. It restricts number of arbitrary enforces many zeros effective mass matrices. (ii) Flavor breaking from \to nothing generates family hierarchy. also...
We investigate diboson signals in the standard model (SM) with an extended Higgs sector, motivated by excesses channels at LHC. begin unitarity sum rules of weak gauge boson scattering assuming sector is extended. According to rules, we discuss interpretations and consistency ATLAS anomaly other experimental constraints. As a concrete example, propose two-Higgs-doublet where Yukawa coupling extra $CP$-even scalar up-type quark relatively large. The ($WW$ $ZZ$) can be explained 2 TeV boson,...
In the framework of littlest Higgs model with $T$ parity (LHT), we study production processes $T$-even (${T}_{+}$) and $T$-odd (${T}_{\ensuremath{-}}$) partners top quark at Large Hadron Collider (LHC). We show that signal events can be distinguished from standard backgrounds, information about mass mixing parameters measured relatively good accuracies. With measurements these parameters, a nontrivial test LHT performed. also discuss possibility to reconstruct thermal relic density lightest...
The physics potential of an intense source low-energy muons is studied. Such a necessary stage towards building the neutrino factories and muon colliders which are being considered at present. CERN Neutrino Factory could deliver beams with intensities 3‐4 orders magnitude higher than available now, large freedom in choice time structure. Low-energy contributes to many fields b asic research, including rare decays, i.e., decays that do not conserve number, measurements fundamental constants,...