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- 저자 : Nomura, H. (검색결과 299 건)
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Loop suppressed light fermion masses with U(1)R gauge symmetry
Nomura, Takaaki,Okada, Hiroshi American Physical Society 2017 Physical Review D Vol.96 No.1
<P>We propose a model with a two-Higgs doublet, where quark and charged-lepton masses in the first and second families are induced at one-loop level, and neutrino masses are induced at the two-loop level. In our model, we introduce an extra U(1)R gauge symmetry that plays a crucial role in achieving desired terms in no conflict with anomaly cancellation. We show the mechanism to generate fermion masses, the resultant mass matrices, and Yukawa interactions in mass eigenstates, and we discuss several interesting phenomenologies such as the muon anomalous magnetic dipole moment and the dark matter candidate that arise from this model.</P>
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『土名對照鮮滿植物字彙』(1932)의 식물생활민속지적 의의와 『鄕藥集成方』(1433) 초부 상품과의 관계성 고찰
Nomura Michiyo 동아시아고대학회 2019 동아시아고대학 Vol.0 No.54
This article selected Domei taisho senman syokubutsu jii (土名對照鮮滿植物字彙) as analysis data to find the relationship between pre modern plant names and scientific names, the outcome of modern plant classification, as part of preparatory work to access botanical ethnographic knowledge in the pre modern era, and selected Sangpums (上品) 1∼52 of Chobu (草部) (Part of Herbs) from Hyangyak jipseongbang (鄕藥集成方) as data about pre modern plant names. The composition and ethnographic significance of Domei taisho senman syokubutsu jii were determined, and then the relationship between Tomyeong 1daejo seonman singmul jahwi and Hyangyak jipseongbang was considered. As a result, it was found that Domei taisho senman syokubutsu jii contains descriptions very relevant to life culture thanks to the author’s field survey as well as the Korean names, Chinese names, Japanese names, and scientific names of plants, and thus that it also has botanical ethnographic value. In addition, modern scientific names for Sangpums of Chobu in Hyangyak jipseongbang were identified, and the position of each of Sangpums of Chobu from Hyangyak jipseongbang under the modern classification were also identified. The present article has limitations in that its objects of analysis were limited to Sangpums of Chobu from Hyangyak jipseongbang, and thus the analysis of their contents and the contrast with Domei taisho senman syokubutsu jii ended up being within the limits. And yet, it was possible to grasp tendency even from the partial portions, and it was confirmed that the remaining portions are also worth detailed investigation. 본 연구는 전근대시기의 식물 명칭을 근대적 식물분류와 연결시킨 자료를 발굴하여 그것으로 전근대시기의 식물민속지식에 접근할 수 있게 하는 것을 목적으로 수행되었다. 이 목적에 적합한 자료로 『土名對照鮮滿植物字彙』(1932)를 선택했으며, 전근대 식물 명칭의 자료로서 『鄕藥集成方』(1433)을 선택했다. 연구를 진행하면서 『土名對照鮮滿植物字彙』는 다른 식물학 책과는 달리, 식물학적 내용뿐만 아니라 식물과 관련된 의식주와 각종 관습을 알 수 있는 단서가 되는 내용이 다수 포함되어 있는 것을 알게 되었다. 또한 저자의 무라타도 식물채집과 문헌연구만이 아니라 조선과 만주를 몇 차례에 걸쳐 방문하고 현지인을 대상으로 조사한 인물이었다. 그의 작업은 일반 사람들을 대상으로 현지에 가서 조사를 해 그 결과를 민속지로 기록하는 민속학의 연구방법과 상통한다. 그래서 이 책은 단순히 식물의 사전이라는 범주를 넘어, 저작된 당시의 생활문화를 담은 민속지적인 가치를 가지게 되었다는 것을 알 수 있었다. 『鄕藥集成方』의 관계성 분석을 통해 『鄕藥集成方』 초부 상품에 해당되는 각 식물의 근대식 학명을 알 수 있었다. 조선시대 초기의 식물 명칭이 근대의 어느 학명에 해당되는지를 밝힘으로서 전근대시기의 식물민속지식에 접근할 방도를 제시할 수 있게 되었다. 또한 근대적 분류에서 『鄕藥集成方』 초부 상품의 각 식물의 위치도 확인 할 수 있었다. 본고는 분석 대상이 『鄕藥集成方』초부 상품에 해당되는 부분에 한정되어, 내용 분석과 『土名對照鮮滿植物字彙』과의 대조가 그 범위 안에 머무른 점이 연구의 한계점이다. 그러나 그 일부분에서도 경향성을 파악할 수 있었으며 남은 부분도 상세하게 검토할 가치가 있음을 확인할 수 있었다.
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Radiative seesaw model with degenerate Majorana dark matter
Nomura, Takaaki,Okada, Hiroshi,Orikasa, Yuta American Physical Society 2016 Physical Review D Vol.93 No.11
<P>We study a three-loop-induced neutrino mass model with exotic vectorlike isospin doublet leptons which contain a dark matter candidate. Then we explore lepton flavor violations and dark matter physics in a coannihilation system. In this paper, the nearly degenerate Majorana fermion dark matter can naturally be achieved at the two-loop level, while the mass splitting can be larger than O (200) keV which is required from the constraint of the direct detection search with spin-independent inelastic scattering through the Z-boson portal. As a result, a monochromatic photon excess, with threshold energy greater than O(200) keV, is predicted in our model and could be measured through indirect detection experiments such as INTEGRAL.</P>
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SU(2)Lseptet scalar linking to a radiative neutrino model
Nomura, Takaaki,Okada, Hiroshi,Orikasa, Yuta American Physical Society 2016 Physical Review D Vol.94 No.5
<P>We study a radiative neutrino model with a SU(2) septet scalar with hypercharge Y = 2 where active neutrino mass is induced at a one-loop level. Calculating a one-loop diagram, mass matrices for an active neutrino are derived. We also analyze lepton flavor violations, the anomalous magnetic moment of a muon, and the flavor-violating Higgs decay h -> mu tau. Then, sizable muon g - 2 and similar to 1% of BR(h -> mu tau) could be obtained in our setup. Furthermore, the collider signature of the septet is discussed, and we focus on the quadratically charged scalar at the LHC 14 TeV. We find that it could be discovered up to 1.5 TeV mass by searching multicharged lepton signal events.</P>
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Generalized Zee-Babu model with 750 GeV diphoton resonance
Nomura, T.,Okada, H. North-Holland Pub. Co 2016 Physics letters. Section B Vol.756 No.-
We propose a generalized Zee-Babu model with a global U(1) B-L symmetry, in which we classify the model in terms of the number of the hypercharge N/2 of the isospin doublet exotic charged fermions. Corresponding to each of the number of N, we need to introduce some multiply charged bosons in order to make the exotic fields decay into the standard model fields. We also discuss the muon anomalous magnetic moment and the diphoton excess depending on N, and we show what kind of models are in favor of these phenomenologies.
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Extended colored Zee-Babu model
Nomura, Takaaki,Okada, Hiroshi American Physical Society 2016 Physical Review D Vol.94 No.7
<P>We study the extended colored Zee-Babu model introducing a vectorlike quark and singlet scalar. The active neutrino mass matrix and muon anomalous magnetic moment, which can be fitted to experimental data satisfying the constraints from the flavor-changing neutral current, are analyzed. Then, we discuss the constraint from h(SM) -> gamma gamma the implication of an exotic diphoton resonance as a signature of the model, and the stability of the scalar potential. In addition, we discuss the signature of our model via vectorlike quark production.</P>
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