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Nomura, Takaaki,Okada, Hiroshi North-Holland Pub. Co 2019 Physics letters. Section B Vol.792 No.-
<P><B>Abstract</B></P> <P>We propose an inverse seesaw model with large S U <SUB> ( 2 ) L </SUB> multiplet fields which realizes natural mass hierarchies among neutral fermions. Here, lighter neutral fermion mass matrices are induced via two suppression mechanisms; one is small vacuum expectation value of S U <SUB> ( 2 ) L </SUB> triplet required by rho parameter constraint and the other is generation of Majorana mass term of extra singlet fermions at one-loop level. To realize the loop masses, we impose <SUB> Z 2 </SUB> symmetry which also guarantees stability of a dark matter candidate. Furthermore, we discuss anomalous magnetic moment and collider physics from interactions of large multiplet fields.</P>
Minimal realization of right-handed gauge symmetry
Nomura, Takaaki,Okada, Hiroshi American Physical Society 2018 Physical review. D Vol.97 No.1
<P>We propose a minimally extended gauge symmetry model with U(1)(R), where only the right-handed fermions have nonzero charges in the fermion sector. To achieve both anomaly cancellations and minimality, three right-handed neutrinos are naturally required, and the standard model Higgs has to have nonzero charge under this symmetry. Then we find that its breaking scale(Lambda) is restricted by precise measurement of neutral gauge boson in the standard model; therefore, O(10) TeV less than or similar to Lambda We also discuss its testability of the new gauge boson and discrimination of U(1)(R) model from U(1)(B-L) one at collider physics such as LHC and ILC.</P>
Nomura, Akihiro,Won, Hong-Hee,Khera, Amit V.,Takeuchi, Fumihiko,Ito, Kaoru,McCarthy, Shane,Emdin, Connor A.,Klarin, Derek,Natarajan, Pradeep,Zekavat, Seyedeh M.,Gupta, Namrata,Peloso, Gina M.,Borecki, Grune & Stratton 2017 Circulation research Vol.121 No.1
<P>Conclusions: Compared with noncarriers, carriers of PTV at CETP displayed higher high-density lipoprotein cholesterol, lower low-density lipoprotein cholesterol, lower triglycerides, and lower risk for CHD.</P>
Nomura,Tsuyoshi,Suzuki,Motoyuki 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.15 No.1
Porous membrane of poly(tetrafluoroethylene)(PTFE) was formed on the surface of porous ceramic tubes by means of heat treatment of the PTFE particles deposit layer prepared by filtering PTFE microparticles emulsified in aqueous phase. By means of inert gas permeation, pore size was determined and compared with scanning electron micrograph observation. Also rejection measurement of aqueous dextran solutions of wide range of molecular weights showed the consistent result regarding the pore size. Since the membrane prepared by this method is stable and has unique features derived from PTFE, it is expected that the membrane has interesting applications in the field of water treatment.
Nomura, Takaaki,Okada, Hiroshi North-Holland Pub. Co 2018 Physics letters. Section B Vol.783 No.-
<P><B>Abstract</B></P> <P>We propose a model of neutrino mass matrix with large S U ( 2 ) multiplets and gauged U <SUB> ( 1 ) <SUB> L μ </SUB> − <SUB> L τ </SUB> </SUB> symmetry, in which we introduce S U ( 2 ) quartet scalar and quintet fermions with nonzero <SUB> L μ </SUB> − <SUB> L τ </SUB> charge. Then we investigate the neutrino mass structure and explore phenomenologies of large multiplet fields at the collider, particularly, focusing on doubly- and singly- charged exotic leptons from the quintet.</P>
Discriminating leptonic Yukawa interactions with doubly charged scalar at the ILC
Nomura, Takaaki,Okada, Hiroshi,Yokoya, Hiroshi Elsevier 2018 Nuclear Physics, Section B Vol.929 No.-
<P><B>Abstract</B></P> <P>We explore discrimination of two types of leptonic Yukawa interactions associated with Higgs triplet, L ¯ L c Δ <SUB> L L </SUB> , and with S U ( 2 ) singlet doubly charged scalar, e ¯ R c <SUP> k + + </SUP> <SUB> e R </SUB> . These interactions can be distinguished by measuring the effects of doubly charged scalar boson exchange in the <SUP> e + </SUP> <SUP> e − </SUP> → <SUP> ℓ + </SUP> <SUP> ℓ − </SUP> processes at polarized electron-positron colliders. We study a forward-backward asymmetry of scattering angular distribution to estimate the sensitivity for these effects at the ILC. In addition, we investigate prospects of upper bounds on the Yukawa couplings by combining the constraints of lepton flavor violation processes and the <SUP> e + </SUP> <SUP> e − </SUP> → <SUP> ℓ + </SUP> <SUP> ℓ − </SUP> processes at the LEP and the ILC.</P>