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Radiative seesaw mechanism in a minimal 3-3-1 model
Okada, Hiroshi,Okada, Nobuchika,Orikasa, Yuta American Physical Society 2016 Physical Review D Vol.93 No.7
<P>We study the neutrino sector in a minimal SU(3)(L) x U(1)(X) model, in which its mass is generated at a one-loop level with the charged lepton mass, and hence, there exists a strong correlation between the charged-lepton mass and the neutrino mass. We identify the parameter region of this model to satisfy the current neutrino oscillation data as well as the constraints on lepton flavor violating processes. We also discuss a possibility to explain the muon anomalous magnetic moment.</P>
Higgs phenomenology in the minimalSU(3)L×U(1)Xmodel
Okada, Hiroshi,Okada, Nobuchika,Orikasa, Yuta,Yagyu, Kei American Physical Society 2016 Physical Review D Vol.94 No.1
<P>We investigate the phenomenology of a model based on the SU(3)(c) x SU(3)(L) x U(1)(X) gauge theory, the so-called 331 model. In particular, we focus on the Higgs sector of the model which is composed of three SU(3)L triplet Higgs fields and is the minimal form for realizing a phenomenologically acceptable scenario. After the spontaneous symmetry breaking SU(3)(L) x U(1)(X) -> SU(2)(L) x U(1)(Y), our Higgs sector effectively becomes that with two SU(2)(L) doublet scalar fields, in which the first-and the second-generation quarks couple to a different Higgs doublet from that which couples to the third-generation quarks. This structure causes the flavor-changing neutral current mediated by Higgs bosons at the tree level. By taking an alignment limit of the mass matrix for the CP-even Higgs bosons, which is naturally realized in the case with the breaking scale of SU(3)(L) x U(1)(X) much larger than that of SU(2)(L) x U(1)(Y), we can avoid current constraints from flavor experiments such as the B-0-(B) over bar (0) mixing even for the Higgs bosons masses that are O(100) GeV. In this allowed parameter space, we clarify that a characteristic deviation in quark Yukawa couplings of the Standard Model-like Higgs boson is predicted, which has a different pattern from that seen in two Higgs doublet models with a softly broken Z(2) symmetry. We also find that the flavor-violating decay modes of the extra Higgs boson, e.g., H/A -> tc and H-+/- -> ts, can be dominant, and they yield the important signature to distinguish our model from the two Higgs doublet models.</P>
Erythema Nodosum Masking Kawasaki Disease with an Initial Manifestation of Skin Lesions
Seigo Okada,Yuichi Ishikawa,Maiko Shimomura,Shinpei Sunagawa,Reiji Hirano,Shinnosuke Fukunaga,Akiko Miyake,Yusuke Okada,Takashi Maki 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.3
We report the first case demonstrating an association between Kawasaki disease (KD) and erythema nodosum (EN). A 3-year-oldgirl presented with EN as an initial manifestation of KD. At the initial visit, she showed high fever of 40°C, injection of the oropharynx,cervical lymphadenopathy, and red-purple cutaneous nodules, particularly on the lower limbs. She complained of severepain in the neck and cutaneous lesions. Initially, the development of EN was attributed to Salmonella spp infection, which wasdetected in stool culture. However, the patient did not respond to high-dose ampicillin/sulbactam to which the Salmonella spp issensitive. Echocardiography performed as screening for fever of unknown origin revealed medium-sized aneurysms of the leftanterior descending artery. EN masked the diagnosis of KD, and the patient developed a coronary artery lesion. KD should beconsidered in the differential diagnosis of refractory EN in pediatric patients.
Classically conformal radiative neutrino model with gauged B-L symmetry
Okada, H.,Orikasa, Y. North-Holland Pub. Co 2016 Physics letters. Section B Vol.760 No.-
We propose a classically conformal model in a minimal radiative seesaw, in which we employ a gauged B-L symmetry in the standard model that is essential in order to work the Coleman-Weinberg mechanism well that induces the B-L symmetry breaking. As a result, nonzero Majorana mass term and electroweak symmetry breaking simultaneously occur. In this framework, we show a benchmark point to satisfy several theoretical and experimental constraints. Here theoretical constraints represent inert conditions and Coleman-Weinberg condition. Experimental bounds come from lepton flavor violations (especially μ→eγ), the current bound on the Z<SUP>'</SUP> mass at the CERN Large Hadron Collider, and neutrino oscillations.
K-Ar Age Detwermination of a Lava Stalagmite in Manjang Cave Jeju Island Korea
Okada, Toshinori,Itaya, Tetsumaru,Sawa, Isao,Hong, Shi-Hwan The Speleological Society 1995 Journal of the speleological society of korea Vol.42 No.2
THE K-AR METHOD of age determination is commonly used to date rocks from Pleistocene volcanoes in Japan (e.g. Kaneoka et al. 1980, Itaya et al. 1984, Shimizu et al. 1988, Itaya et al. 1989). However. there are still many problems with K-Ar dating of the young volcanic rocks, as reviewed by Itaya and Nagao (1988).(omitted)
3.55 keV X-ray line signal from excited dark matter in radiative neutrino model
Okada, H.,Toma, T. Elsevier 2014 Physics letters: B Vol.737 No.-
We study an exciting dark matter scenario in a radiative neutrino model to explain the X-ray line signal at 3.55 keV recently reported by XMN-Newton X-ray observatory using data of various galaxy clusters and Andromeda galaxy. We show that the required large cross section for the up-scattering process to explain the X-ray line can be obtained via the resonance of the pseudo-scalar. Moreover, this model can be compatible with the thermal production of dark matter and the constraint from the direct detection experiment.