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>

Participatory and Adaptive Approaches for Integrated Disaster Risk Management

Norio Okada 충북대학교 국가위기관리연구소 2009 충북대학교 국가위기관리연구소 학술세미나 Vol.2009 No.1

Participatory and Adaptive Approaches for Integrated Disaster Risk Management (pp.1-6)

Norio Okada 국가위기관리학회 2009 국가위기관리학회 학술대회 Vol.2009 No.1

臺北法華寺と岡田日惺(榮源)

岡田真美子(OKADA, Mamiko) 동북아시아문화학회 2013 동북아시아문화학회 국제학술대회 발표자료집 Vol.2013 No.5

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.

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.

Institutions, Corporate Environment and Transformation of Japanese Management

Okada, Yoshitaka THE MANAGEMENT RESEARCH CENTRE YONSEI UNIVERSITY 1998 SANGNAM FORUM Vol.1 No.1

Japanese firms effectively coped with economic difficulties in the 50s and 60s by reemphasizing some traditional human-relation-oriented social norms and implementing diverse mechanisms to promote harmony and cooperation in intra-and inter-firm relations. Consequently, they greatly benefited from synergetic effects, and developed the cooperation-oriented business system. Stability generated from such development, however, could not deal with turbulent corporate environment in the 70s and 80s. Japanese firms needed to generate flexibility and dynamics, but without losing the benefits of synergeic effects. They implemented diverse competitive mechanisms, to the extent that benefits from intensive cooperative activities were not significantly reduced. Such competitive-cum-cooperative (CCC) business system enabled them to benefit from both synergetic and market-like effects. Even facing new corporate environment in the 90s, they are implementing practices. not much deviating from the CCC system. The nenpo system, applied mostly to managers, increases a proportion of performance payment, while it guarantees the minimum amount based on nenko wages or qualification, or with a fixed amount. Its purpose is to preserve the benefits of synergetic effects, while increase of the proportion of performance payment requires more effective monitoring and fairer evaluation, stimulates intrafirm competition, and generates flexibility and openness. The increase rather functions to make psychological and motivational stimulation to highly cooperation-oriented Japanese management, not to replace the management with a new one. Evidence indicates that the Japanese business systems have been evolving by reinterpreting the social norms of interpersonalism, without deviating drastically from its path dependent characteristics.

Neutron and proton energy spectra from the non-mesonic weak decays of HeΛ5 and CΛ12

Okada, S.,Ajimura, S.,Aoki, K.,Banu, A.,Bhang, H.C.,Fukuda, T.,Hashimoto, O.,Hwang, J.I.,Kameoka, S.,Kang, B.H.,Kim, E.H.,Kim, J.H.,Kim, M.J.,Maruta, T.,Miura, Y.,Miyake, Y.,Nagae, T.,Nakamura, M.,Nak Elsevier 2004 Physics letters: B Vol.597 No.3

<P><B>Abstract</B></P><P>We have simultaneously measured the energy spectra of neutrons and protons emitted in the non-mesonic weak decays of HeΛ5 and CΛ12 hypernuclei produced via the (<SUP>π+</SUP>,<SUP>K+</SUP>) reaction with much higher statistics than those of previous experiments. The neutron-to-proton yield ratios for both hypernuclei at a high energy threshold (60 MeV) were approximately equal to two, which suggests that the ratio of the neutron- and proton-induced decay channels, <SUB>Γn</SUB>(Λn→nn)/<SUB>Γp</SUB>(Λp→np), is about 0.5. In the neutron energy spectra, we found that the yield of the low-energy component is unexpectedly large, even for HeΛ5.</P>

한반도 南部 終末期 櫛文土器와 繩文土器의 年代的 병행관계 검토

Okada Ken Ichi(岡田憲一),Ha In Soo(河仁秀) 한국신석기학회 2009 한국신석기연구 Vol.- No.17

본고의 목적은 동삼동패총에서 출토된 繩文時代 後期土器를 검토 분석함으로써 한 반도 남부 지역 종말기 즐문토기와 승문토기의 연대적 병행관계를 파악하는데 있다. 검토 결과 동삼동패총에서 출토된 2점의 승문토기는 기존에 알려진 승문시대 후기 후엽의 南福寺式토기 등과는 그 형식과 시기를 달리하며, 지금까지 한반도 남해안지 역에서 발견된 승문토기 중 가장 늦은 승문 후기 중엽에서 후엽에 속하는 형식이다. 이것은 기존에 이중구연토기가 연대적으로 승문시대 후기 중엽으로 막연히 인식되어 왔던 사실을 이번 동삼동 출토 승문토기의 분석과 형식 검토를 통해 그 연대를 내 려볼 수 있게 되었음을 의미한다. 또 하나는, 동삼동패총에서 확인된 승문시대 후기 후반 토기가 일본 서북부 구주지 방이 아닌 동북부 구주지방과의 관련을 짐작해 볼 수 있다 점이다. 지금까지 한반도 에서 확인되는 승문시대 후기 전반까지의 토기 요소는 기본적으로 일본 구주의 서북 부 및 중부 구주지방과 관련성이 높은 것으로 추정되어 왔으며, 阿高式, 南福寺式, 사 까나시다식 토기형식이 이를 증명하고 있다. 하지만, 승문시대 후기 중엽 이후가 되면 일변하여 교류대상 지역이 동북부 구주지방으로 전환했을 가능성도 염두에 둘 필요가 있을 것으로 생각된다. 이러한 사실은 한반도 남부와 일본열도와의 교류가 한정된 지 역내에서 만 지속적으로 이루어 진 것이 아니고, 단속적이며 지역적인 관계가 유연하 였음을 반영하는 것으로 추정된다. The study aims to chronological parallel relationships between late chulmun pottery and jomon pottery in the southern Korean peninsula by reviewing and analyzing pottery excavated from Dongsam-dong shell mound in the jomon period. As the results of study, it shows that two pieces of jomon pottery excavated from Dongsam-dong shell mound have different types and times from the previously known late-nanpuguji type pottery in the late jomon period, and they are types involved in the middle-and-late type of the late jomon period, which is latest among jomon pottery which has been found until now in the southern Korean peninsula. In addition, this data can be a clue to analyze parallel relationships of late jomon pottery through the assemblage relations with chulmun pottery. The end of chulmun pottery in the southern Korean peninsula is related with the late mimanda type pottery stage compared to the chronology of jomon pottery in Japan. Through the finding, the fact, that pottery with double mouth rim has been vaguely considered as the middle-pottery of the late jomon period, was examined chronically through an analysis and type review of jomon pottery excavated in Dongsam-dong. On the other hand, the late-pottery, which is excavated from Dongsam-dong shell mound, in the late jomon period is expected to have the relations with Japan’s northeast Kyushu, not with northwest Kyushu. The pottery elements until the beginning of the late jomon pottery, which has been found in the southern Korean peninsula until now, seem to basically have high correlations with Japan’s northwest and central Kyushu, and adagga type pottery, nanpuguji type pottery, and sagganasida type pottery prove this. However, it needs to consider that interchange areas may transfer to the northeast Kyushu by changing completely from the middle of the late jomon period. Based on the fact, it is estimated to reflect that the interchange between the southern Korean peninsula and Japan was not made only in the designated area continuously, and that intermittent and regional relations were flexible.