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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>
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>
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.
Degradation of Hazardous Chemicals by Biological Activated Carbon Treatment
Okada,Mitsumasa 嶺南大學校 環境問題硏究所 1993 環境硏究 Vol.12 No.2
Biodegradation of hazardous organic chemicals in organic wastewater by attached bacteria on biological activated carbon (BAC) with adsorbability were evaluated in comparison with fine particles of support medium (granulated slug (GS), bentonite(BEN)) and conventional activated sludge process (AS) to elucidate the role of activated carbon on the improvement of the performance of biological/physical removal of hazardous chemicals from wastewater. Activated carbon did not improve the performance under steady state operation. Better performance was noted in BAC system under shock loading, increase in the concentration of phenolic waste, of hazardous wastewater than in AS and GS systems. This seemed to be referable to the stimulation of bacterial activity to decompose phenol by activated carbon and to the remaining capacity of adsorption to decrease extracellular concentration of phenol. m-aminobenzoic acid added into the phenolic wastewater was decomposed only in the system added with powdered activated into activated sludge. Biodegradation was unstable both in AS and BEN systems. Although bacterial activity to degrade m-aminobenzoic acid was enhanced in the BAC system, remarkable increase in viable count on the medium with m-aminobenzoic acid as a sole carbon source was not noted. Also, species composition seemed to be identical among BAC, BEN and AS systems. It seemed likely that activated carbon, in addition to the capacity of adsorption, stimulated indigenous bacterial activity without enhancing species succession or population growth to show better performance for biodegradation.