Publications (38)
Affleck-Dine leptogenesis via multiscalar evolution in a supersymmetric seesaw model
Masato Senami, Tsutomu Takayama
A leptogenesis scenario in a supersymmetric standard model extended with introducing right-handed neutrinos is reconsidered. Lepton asymmetry is produced in the condensate of a rig…
Universality of strength for Yukawa couplings with extra down-type quark singlets
Katsuichi Higuchi, Masato Senami, Katsuji Yamamoto
We investigate the quark masses and mixings by including vector-like down-type quark singlets in universality of strength for Yukawa couplings (USY). In contrast with the standard…
Stability of Metastable Vacua in Gauge Mediated SUSY Breaking Models with Ultra Light Gravitino
Junji Hisano, Minoru Nagai, Masato Senami +1
Recently Murayama and Nomura proposed a simple scheme to construct the gauge mediation models, using metastable supersymmetry breaking vacua. It has a possibility to predict the ul…
Enhancement of parity-violating energy difference of HX molecules by electronic excitation
Naoya Kuroda, Takumi Oho, Ayaki Sunaga +1
The parity-violating energy difference (PVED) between two enantiomers of a chiral molecule is caused by the weak interaction. Because of the smallness of the PVED, nonzero PVED is…
Universal Extra Dimension models with right-handed neutrinos
Shigeki Matsumoto, Joe Sato, Masato Senami +1
Relic abundance of dark matter is investigated in the framework of universal extra dimension (UED) models with right-handed neutrinos. These models are free from the KK graviton pr…
Investigation of Possible Dark Matter Direct Detection in Electron Accelerators
Junji Hisano, Minoru Nagai, Mihoko M. Nojiri +1
We investigate a possibility of neutralino dark matter (DM) direct detection in the future electron accelerators. That is counting of high p_T electron recoil events by neutralinos…
Affleck-Dine leptogenesis with triplet Higgs
Masato Senami, Katsuji Yamamoto
We study an extension of the supersymmetric standard model including a pair of electroweak triplet Higgs and . The neutrinos acquire Majorana masses mediated by the…
Comprehensive Analysis on the Light Higgs Boson Scenario
Masaki Asano, Shigeki Matsumoto, Masato Senami +1
Comprehensive analysis on the light Higgs scenario of the minimal supersymmetric standard model is performed in the framework of the non-universal Higgs mass model (NUHM). The NUHM…
Light Higgs boson scenario in the SUSY seesaw model
Masaki Asano, Takayuki Kubo, Shigeki Matsumoto +1
It is demonstrated that the light Higgs boson scenario, which the lightest Higgs mass is less than the LEP bound, mh > 114.4 GeV, is consistent with the SUSY seesaw model. With the…
Increasing the effective number of neutrinos with decaying particles
Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama +2
We present models of decaying particles for increasing the effective number of neutrinos N_nu after big bang nucleosynthesis but before the structure formation begins. We point out…
Production Rate of Second KK Gauge Bosons in UED Models at LHC
Shigeki Matsumoto, Joe Sato, Masato Senami +1
We calculate the production rates of the second Kaluza-Klein (KK) photon $γ^{(2)}$ and Z boson at the LHC including all significant processes in the minimal universal ex…
Electric Dipole Moments in PseudoDirac Gauginos
Junji Hisano, Minoru Nagai, Tatsuya Naganawa +1
The SUSY CP problem is one of serious problems in construction of realistic supersymmetric standard models. We consider the problem in a framework in which adjoint chiral multiplet…
Regional chemical potential analysis for material surfaces
Masahiro Fukuda, Masato Senami, Yoshiaki Sugimoto +1
We propose a local regional chemical potential (RCP) analysis method based on an energy window scheme to quantitatively estimate the selectivity of atomic and molecular adsorption…
Fate of the False Vacuum Revisited
Shigeki Matsumoto, Keiko I. Nagao, Makoto Nakamura +1
We find the novel effect on the decay of a false vacuum in view of quantum field theory, which is induced by a field coupling to the scalar field related to a first-order phase tra…
The neutrino masses and the change of allowed parameter region in universal extra dimension models
Shigeki Matsumoto, Joe Sato, Masato Senami +1
Relic abundance of dark matter is investigated in the framework of universal extra dimension models with right-handed neutrinos. These models are free from the serious Kaluza-Klein…
Non-perturbative Effect on Thermal Relic Abundance of Dark Matter
Junji Hisano, Shigeki Matsumoto, Minoru Nagai +2
We point out that thermal relic abundance of the dark matter is strongly altered by a non-perturbative effect called the Sommerfeld enhancement, when constituent particles of the d…
Enhancement of the molecular electron chirality by electronic excitation
Naoya Kuroda, Masato Senami
Previously, it was predicted that the parity-violating energy difference (PVED) between enantiomers and the molecular electron chirality (MEC), which is the integrated value of the…
Cosmological implications of supersymmetric axion models
Masahiro Kawasaki, Kazunori Nakayama, Masato Senami
We derive general constraints on supersymmetric extension of axion models, in particular paying careful attention to the cosmological effects of saxion. It is found that for every…
Relic Abundance of LKP Dark Matter in UED model including Effects of Second KK Resonances
Mitsuru Kakizaki, Shigeki Matsumoto, Yoshio Sato +1
We reevaluate the thermal relic density of the Kaluza-Klein (KK) dark matter in universal extra dimension models. In particular, we consider the effect of the resonance caused by s…
Leptogenesis via multiscalar coherent evolution with supersymmetric neutrino see-saw
Masato Senami, Katsuji Yamamoto
A novel scenario of leptogenesis is investigated in the supersymmetric neutrino see-saw model. The right-handed sneutrino and the field in the $ {\tilde L} H_u…
Significant effects of second KK particles on LKP dark matter physics
Mitsuru Kakizaki, Shigeki Matsumoto, Yoshio Sato +1
We point out that Kaluza-Klein (KK) dark matter physics is drastically affected by second KK particles. In this work various interesting phenomena caused by the second KK modes are…
Flat manifold leptogenesis in the supersymmetric standard model
Masato Senami, Katsuji Yamamoto
Flat manifold leptogenesis a la Affleck-Dine is investigated with the slepton and Higgs fields, L, H_u, H_d, in the supersymmetric standard model. The multi-dimensional motion of t…
Solving cosmological problem in universal extra dimension models by introducing Dirac neutrino
Shigeki Matsumoto, Joe Sato, Masato Senami +1
Universal extra dimension (UED) models with right-handed neutrinos are studied. The introduction of the neutrinos makes us possible not only to describe Dirac neutrino masses but a…
Relic abundance of dark matter in universal extra dimension models with right-handed neutrinos
Shigeki Matsumoto, Joe Sato, Masato Senami +1
Relic abundance of dark matter is investigated in the framework of universal extra dimension models with right-handed neutrinos. These models are free from the serious Kaluza-Klein…
Relic abundance of dark matter in the minimal universal extra dimension model
Mitsuru Kakizaki, Shigeki Matsumoto, Masato Senami
We investigate the relic abundance of dark matter in the minimal universal extra dimension model including resonance processes by second Kaluza-Klein (KK) particles in all coannihi…
Enhancement of parity-violating energy difference of CHFClBr, CHFClI, and CHFBrI by breaking the cancellation among valence orbital contributions
Naoya Kuroda, Ayaki Sunaga, Masato Senami
The enhancement of the parity-violating energy difference (PVED) by electronic excitation is studied for H ( O, S, Se, Te), CHFClBr, CHFClI, and CHFBrI. To clarify the…
Parity violation effects in helical osmocene: theoretical analysis and experimental prospects
Eduardus, Agathe Bonifacio, Mathieu Manceau +11
We present a computational investigation of the parity-violating (PV) contributions to the vibrational transitions and nuclear magnetic resonance shieldings of helical osmocene. A…
Lepton flavor violation with supersymmetric Higgs triplets in TeV region for neutrino masses and leptogenesis
Masato Senami, Katsuji Yamamoto
Lepton flavor violating processes such as μ\to 3e and μ\to e γare investigated with supersymmetric Higgs triplet pair Îand \bar Îin the light of neutrino masses and experiment…
Electron chirality and hydrodynamic helicity: Analysis in the atomic limit
Tatsuya Miki, Yuta Kakinuma, Masato Senami +4
Electron chirality has been proposed as a microscopic quantity that characterizes electronic handedness, yet its underlying control parameter has not been clearly identified. Furth…
Productions of second Kaluza-Klein gauge bosons in the minimal universal extra dimension model at LHC
Shigeki Matsumoto, Joe Sato, Masato Senami +1
We calculate the production rates of the second Kaluza-Klein (KK) photon $γ^{(2)}$ and Z boson at the LHC including all significant processes in the minimal Universal Ex…
Baryogenesis via left-right asymmetry generation by Affleck-Dine mechanism in Dirac neutrino model
Masato Senami, Tsutomu Takayama
A baryogenesis scenario in supersymmetric standard models with Dirac neutrinos proposed by Abel and Page is reconsidered with introducing intermediate scale physics to stabilize th…
Efficient Coannihilation Process through Strong Higgs Self-Coupling in LKP Dark Matter Annihilation
Shigeki Matsumoto, Masato Senami
We point out that the lightest Kaluza-Klein particle (LKP) dark matter in universal extra dimension (UED) models efficiently annihilates through the coannihilation process includin…
Heavy Wino-like Neutralino Dark Matter Annihilation into Antiparticles
Junji Hisano, Shigeki Matsumoto, Osamu Saito +1
The lightest neutralino is a viable dark matter (DM) candidate. In this paper we study indirect detection of the wino-like neutralino DM using positrons and antiprotons from the an…
Neutralino Dark Matter in Light Higgs Boson Scenario
Masaki Asano, Shigeki Matsumoto, Masato Senami +1
Phenomenology of neutralino dark matter in the minimal supersymmetric model is discussed for a scenario where the lightest Higgs boson mass is lighter than 114.4 GeV. We show that…
Leptogenesis with supersymmetric Higgs triplets in TeV region
Masato Senami, Katsuji Yamamoto
The leptogenesis with supersymmetric Higgs triplets is studied in the light of experimental verification in the TeV region. The lepton number asymmetry appears just after the infla…
Electron Chirality in Amino Acid Molecules
Masato Senami, Tomoki Shimizu
We evaluated the total electron chirality in alanine, serine, and valine, which are molecules that have chiral structures. Previously, it has been considered that the total electro…
Leptogenesis Scenarios via Non-Thermally Produced Right-handed Neutrino and Sneutrino in Supersymmetric Seesaw Model
Masato Senami, Tsutomu Takayama
We reconsidered leptogenesis scenario from right-handed (s)neutrino produced by the decay of inflaton. Besides the well-investigated case that the neutrino decays instantaneously a…
CDMS II result and Light Higgs Boson Scenario of the MSSM
Masaki Asano, Shigeki Matsumoto, Masato Senami +1
The CDMS Collaboration has reported two candidate events for dark matter. If the events are due to the elastic scattering of dark matter, the dark matter would be a WIMP dark matte…