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Four-loop neutrino model inspired by diphoton excess at 750 GeV
Nomura, Takaaki,Okada, Hiroshi North-Holland Pub. Co 2016 Physics letters. Section B Vol.755 No.-
<P><B>Abstract</B></P> <P>We propose a four-loop induced radiative neutrino mass model inspired by the diphoton excess at 750 GeV recently reported by ATLAS and CMS, in which a sizable diphoton excess is obtained via photon fusion introducing multi doubly-charged scalar bosons. Also we discuss the muon anomalous magnetic moment, and a dark matter candidate. The main process to explain the observed relic density relies on the final state of the new particle at 750 GeV. Finally we show the numerical results and obtain allowed region of several physical values in our model.</P>
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>
Two-loop induced Majorana neutrino mass in a radiatively induced quark and lepton mass model
Nomura, Takaaki,Okada, Hiroshi American Physical Society 2016 Physical Review D Vol.94 No.9
<P>A two-loop induced radiative neutrino model is proposed as an extension of our previous work in which the first-and second-generation standard model fermion masses are generated at the one-loop level in both quark and lepton sectors. Then we discuss the current neutrino oscillation data, lepton flavor violations, muon anomalous magnetic moment, and a bosonic dark matter candidate, for both the normal and inverted neutrino mass hierarchy. Our numerical analysis shows that fewer hierarchical Yukawa coupling constants can fit the experimental data with TeV-scale dark matter.</P>
Radiative neutrino model with SU(2)L triplet fields
Nomura, Takaaki,Okada, Hiroshi,Orikasa, Yuta American Physical Society 2016 Physical Review D Vol.94 No.11
<P>We propose a loop-induced neutrino mass model, in which we introduce several exotic fermions and bosons with an SU(2)(L) multiplet, and discuss various phenomenologies such as lepton flavor violations, the muon anomalous magnetic moment, nonstandard interacting neutrinoless double beta decay, the relic density of dark matter, and the possibility of the spin-independent direct detection searches, imposing the constraints of oblique parameters. And we show a benchmark point to satisfy all the constraints and discuss our predictions.</P>
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.
Neutrino mass with large SU(2)L multiplet fields
Nomura, Takaaki,Okada, Hiroshi American Physical Society 2017 Physical Review D Vol.96 No.9
<P>We propose an extension of the standard model introducing large SU(2)(L) multiplet fields which are quartet and septet scalars and quintet Majorana fermions. These multiplets can induce the neutrino masses via interactions with the SU(2) doublet leptons. We then find the neutrino masses are suppressed by a small vacuum expectation value of the quartet/septet and an inverse of the quintet fermion mass, relaxing the Yukawa hierarchies among the standard model fermions. We also discuss collider physics at the Large Hadron Collider, considering the production of charged particles in these multiplets, and due to the effects of violating the custodial symmetry, some specific signatures can be found. Then, we discuss the detectability of these signals.</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 Elsevier 2017 Physics letters: B Vol.774 No.-
<P><B>Abstract</B></P> <P>We propose a model with U <SUB> ( 1 ) B − L </SUB> gauge symmetry and several new fermions in no conflict with anomaly cancellation where the neutrino masses are given by the vacuum expectation value of Higgs triplet induced at the one-loop level. The new fermions are odd under discrete <SUB> Z 2 </SUB> symmetry and the lightest one becomes dark matter candidate. We find that the mass of dark matter is typically O ( 1 ) - O ( 10 ) GeV. Then relic density of the dark matter is discussed.</P>