Hisaki Hatanaka

Polyakov loops and the Hosotani mechanism on the lattice

We explore the phase structure and symmetry breaking in four-dimensional SU(3) gauge theory with one spatial compact dimension on the lattice (

A Three-Loop Neutrino Model with Global

16^3 \times 4

U(1)

lattice) in the presence of fermions in the adjoint representation with periodic boundary conditions. We estimate numerically the density plots of the Polyakov loop eigenvalues phases, which reflect the location of minima of the effective potential in the Hosotani mechanism. We find strong indication that the four phases found on the lattice correspond to SU(3)-confined, SU(3)-deconfined, SU(2) x U(1), and U(1) x U(1) phases predicted by the one-loop perturbative calculation. The case with fermions in the fundamental representation with general boundary conditions, equivalent to the case of imaginary chemical potentials, is also found to support the

Symmetry

Z_3

Nonuniversal Z '(') couplings in B decays

symmetry breaking in the effective potential analysis.

Novel universality and Higgs decay H → ,gg in the SO(5) × U(1) gauge-Higgs unification

We study a three-loop induced neutrino model with a global U( 1) symmetry at TeV scale, in which we naturally accommodate a bosonic dark matter candidate. We discuss the allowed regions of masses and quartic couplings for charged scalar bosons as well as the dark matter mass on the analogy of the original Zee–Babu model, and show the difference between them. We also discuss that the possibility of the collider searches in a future like-sign electron liner collider could be promising.

K(1)(1270)-K(1)(1400) Mixing Angle and New-Physics Effects in B ---> K(1) l+ l- Decays

We study the impacts of nonuniversal

Novel universality and Higgs decay H -> \gamma \gamma, gg in the SO(5) x U(1) gauge-Higgs unification

Z^{\prime}

SUSY breaking scales in the gauge-Higgs unification

model, providing flavor changing neutral current at tree level, on the branching ratios (BRs), CP asymmetries (CPAs) and polarization fractions of B decays. We find that for satisfying the current data, the new left- and right-handed couplings have to be included at the same time. The new introduced effective interactions not only could effectively explain the puzzle of small longitudinal polarization in

Dark matter in the SO(5) ×U(1) gauge-Higgs unification

B\to K^* \phi