53 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of TokyoJP6 papers
- Kyoto UniversityJP4 papers
- Kyushu UniversityJP4 papers
- University of MiyazakiJP4 papers
- Saitama UniversityJP3 papers
- High Energy Accelerator Research OrganizationJP2 papers
- Institute of Particle and Nuclear Studies1 paper
- University of California, RiversideUS1 paper
- Yokohama National UniversityJP1 paper
- Yukawa Institute for Theoretical PhysicsJP1 paper
13 papers
Dark photon pair production via off-shell dark Higgs at FASER
Takeshi Araki, Kento Asai, Yohei Nakashima +1
We consider a dark photon model in which the dark U(1) gauge symmetry is spontaneously broken by a vacuum expectation value of a new scalar boson. We focus on the ForwArd Search Ex…
Search for Lepton Flavor Violating Decay at FASER
Takeshi Araki, Kento Asai, Hidetoshi Otono +2
FASER is one of the promising experiments which search for long-lived particles beyond the Standard Model. In this paper, we consider charged lepton flavor violation (CLFV) via a l…
Electron Beam Dump Constraints on Light Bosons with Lepton Flavor Violating Couplings
Takeshi Araki, Kento Asai, Takashi Shimomura
We study constraints on light and feebly interacting bosons with lepton flavor violation from electron beam dump experiments. Scalar, vector, and dipole interactions of the bosons…
Resolving the Hubble tension in a U(1) model with Majoron
Takeshi Araki, Kento Asai, Kei Honda +4
In this paper, we explore possibilities of resolving the Hubble tension and anomaly simultaneously in a U(1) model with Majoron. We only focus on a case wher…
Dark Photon from Light Scalar Boson Decays at FASER
Takeshi Araki, Kento Asai, Hidetoshi Otono +2
FASER is one of the promising experiments which search for long-lived particles beyond the Standard Model. In this paper, we focus on dark photon associating with an additional U(1…
The Fermion Determinant, its Modulus and Phase
H. Kikuchi
We consider path integration of a fermionic oscillator with a one-parameter family of boundary conditions with respect to the time coordinate. The dependence of the fermion determi…
Fermion Determinant Calculus
H. Kikuchi
The path-integral of the fermionic oscillator with a time-dependent frequency is analyzed. We give the exact relation between the boundary condition to define the domain in which t…
Valley Views: Instantons, Large Order Behaviors, and Supersymmetry
Hideaki Aoyama, Hisashi Kikuchi, Ikuo Okouchi +2
The elucidation of the properties of the instantons in the topologically trivial sector has been a long-standing puzzle. Here we claim that the properties can be summarized in term…
Valleys in Quantum Mechanics
Hideaki Aoyama, Hisashi Kikuchi, Ikuo Okouchi +2
Conventionally, perturbative and non-perturbative calculations are performed independently. In this paper, valleys in the configuration space in quantum mechanics are investigated…
Recent Developments in the Theory of Tunneling
Hideaki Aoyama, Toshiyuki Harano, Hisashi Kikuchi +3
Path-integral approach in imaginary and complex time has been proven successful in treating the tunneling phenomena in quantum mechanics and quantum field theories. Latest developm…
Fake Instability in the Euclidean Formalism
Hideaki Aoyama, Toshiyuki Harano, Hisashi Kikuchi +2
We study the path-integral formalism in the imaginary-time to show its validity in a case with a metastable ground state. The well-known method based on the bounce solution leads t…
Enhancement of the Transition Magnetic Moments of a Neutrino by Degenerate Electrons
Hisashi Kikuchi
The one-loop induced magnetic dipole moments of a neutrino are examined in a background of degenerate electrons in the standard model. For the nonrelativistic neutrino, they are en…
Decay of Z into Two Light Higgs Bosons
T. V. Duong, E. Keith, Hisashi Kikuchi +1
If the standard electroweak gauge model is extended to include two or more Higgs doublets, there may be a neutral Higgs boson which is light (with a mass of say 10 GeV) but the…