We study the production and the decay of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in gb fusion. The chiral structure of the $H^+ \bar{t} b$ coupling can trigger a particular spin state of the top quark produced in the decay of a Charged Higgs boson and therefore, is sensitive to the underlying mechanism of the electroweak symmetry breaking (EWSB). Taking two benchmark...
We propose a new mechanism for generating matter-antimatter asymmetry via the interference of tree-level diagrams only. We first derive a general result that a nonzero CP-asymmetry can be generated via at least two sets of interfering tree-level diagrams involving either 2→2 or 1→N(with N≥3) processes. We illustrate this point in a simple TeV-scale extension of the Standard Model with an inert...
We present the most systematic approach to discover a sterile neutrino $N$ or constrain $\left| U_{\ell N} \right|^2$, the mixing between active neutrino $\nu_\ell$ (with $\ell=\mu,\tau$) and the sterile neutrino $N$, from $B \to D\ell N$ decays. Our constraint on $\left| U_{\mu N} \right|^2$ achievable from Belle II data is comparable with that from the much larger data set of upgraded LHCb,...
Dark matter (DM) particles in the Universe accumulate in neutron stars (NSs) through their interactions with ordinary matter. It has been known that their annihilation inside the NS core causes late-time heating, with which the surface temperature becomes a constant value of 2000-3000 K for the NS age t > 10^6-10^7 years. This conclusion is, however, drawn based on the assumption that the beta...
We consider the cosmological relaxation of the Higgs mass and the cosmological constant due to the four-form fluxes in four dimensions. We introduce non-minimal four-form couplings for reheating the Universe after the last membrane nucleation and propose some simple examples with a pseudo-scalar or a complex singlet scalar field. We also discuss the implications of the non-minimal four-form...
Higgs inflation is the best fitting model of cosmological inflation after the Planck data. I would like to discuss some recent discussions on fine-tuning, unitarity, violent preheating, and primordial black hole formation in Higgs inflation.
Even though conventional leptonic or lepto-hadronic models of blazar successfully explain the observed electromagnetic component of the flaring signal from the Blazar TXS 0506+056 in a large range of energy window 𝐸𝛾∈(10−1eV,102 GeV), the predicted neutrino flux is too small to be consistent with the IceCube observation at 𝐸𝜈∼300 TeV. We show that a sizable self-interaction of neutrinos with a...
The IBS-CAPP has currently accomplished all its technical challenges towards achieving the ultimate sensitivity in axion dark matter: DFSZ level even for 10% axion dark matter content in the local halo. Early next year we are expecting to receive a low temperature superconducting (LTS), 12T magnet LTS-12T/320mm, based on Nb3Sn cable, from Oxford Instruments, which will enable us to cover the...
We study the strong first order electroweak phase transition (SFOEWPT) with the SO(6)/SO(5) composite Higgs model, whose scalar sector contains one Higgs doublet and one real singlet. Six benchmark models are built with fermion embeddings in 1, 6, and 15 of SO(6). We show that SFOEWPT cannot be triggered under the minimal Higgs potential hypothesis, which assumes the scalar potential is...
In this talk, we present recent highlights of physics results from Belle, other than R(D()), R_K(). We also show a recent status of the Belle II experiment.
I review attempts at constructing models of partial compositeness from strongly coupled gauge theories. A few minimality assumptions allow one to isolate a small number of prototypical models that can be studied on the lattice and probed at colliders. I review recent results in these
two areas, such as the spectrum from the lattice and two possible exotic signatures at colliders, namely...
Depending on the number of Fermions a gauge theory can have a behavior ranging from asymptotic freedom to asymptotic safety. I show the behavior of SU(2) gauge theory with 4,6,8,24, and 48 fermions measured from lattice field theory simulations. We observe limits for the lower and upper edge of the conformal window and measure anomalous dimensions for mass and coupling. We also try to...
We propose a novel strategy to search for new physics signals in timing spectra, envisioning the situation in which new particles come from the decay of a heavier mother particle with a finite particle width. For example, the timing distribution of events induced by the dark matter particle scattering at the detector may populate in a relatively narrow range, forming a "resonance-like" shape....
We show that a holographic abelian Higgs model leads us to the Heun's equation, which is the same one derived for the bag model studied by Lichtenberg. The correspondence between two models resembles the AdS/CFT dictionary. The spectrum follows linear confinement for zero quark mass, while it is highly non-linear for finite quark mass. It can be traced back to the difference in the singularity...
Einstein gravity may be coming from the leading linear term of the curvature in the low energy effective action. As the simplest extension of the Einstein gravity with the higher curvature term, we study the model with the Gauss-Bonnet term, which is the simplest term allowing the equation of motion to be at the 2nd order. The model wi analyze is the dilaton Einstein Gauss-Bonnet theory. We...
We study supergravity BPS equations which correspond to mass- deformation of some representative AdS/CFT examples. The field theory of interest are N=4, D=4 super Yang-Mills, the ABJM model in D=3, and the Brandhuber-Oz fixed point in D=5. For these gauge theories the free energy with mass terms for matter multiplets is calculable in large-N limit using supersymmetric localization technique....
