81 citations · 177 across the 25 of their papers we have counts for
26 papers
Can a minimal radiative seesaw explain the LZ 248 keV event?
Hiroshi Okada, Yoshihiro Shigekami, Jia-Jun Wu
We interpret the recently reported 248~keV nuclear recoil event in the LUX-ZEPLIN (LZ) experiment via inelastic dark matter scattering within the minimal Scotogenic model. A sub-Me…
Neutron Portal and Dark Matter-Baryon Coincidence: from UV Completion to Phenomenology
Sudhakantha Girmohanta, Yuichiro Nakai, Yoshihiro Shigekami +1
We present a dynamical solution to the dark matter-baryon coincidence problem based on the neutron portal operator connecting the visible and dark sector asymmetries. This framewor…
A Minimal Realization of Radiative Dirac Neutrino Masses via a Non-Invertible Fusion Rule
Takaaki Nomura, Hiroshi Okada, Yoshihiro Shigekami
We propose a minimal one-loop radiative framework for Dirac neutrino mass matrix. As a consequence, the Yukawa hierarchies among the SM fermions are alleviated, and radiative type-…
Two-loop rainbow neutrino masses in a non-invertible symmetry
Hiroshi Okada, Yoshihiro Shigekami
We propose two-loop rainbow type of the neutrino mass model via gauging of non-invertible symmetry in which we introduce three families of isospin doublet vector-li…
The Minimal Supersymmetric Standard Model with Non-Invertible Selection Rules
Yuichiro Nakai, Hajime Otsuka, Yoshihiro Shigekami +1
We investigate a framework of the Minimal Supersymmetric Standard Model (MSSM) in which the quark and lepton flavor structure and suppression of flavor-changing neutral currents (F…
Radiative lepton model in a non-invertible fusion rule
Takaaki Nomura, Hiroshi Okada, Yoshihiro Shigekami
We propose a radiatively induced lepton mass model introducing a gauging fusion rule. In our framework, the charged-lepton mass matrix is generated at one-loop level vi…
Models for the Electric Dipole Moment and Anomalous Magnetic Moment of the Tau Lepton
Yuichiro Nakai, Yoshihiro Shigekami, Peng Sun +1
The Belle II experiment and other ongoing and projected lepton facilities are expected to greatly enhance the sensitivity to the electric dipole moment (EDM) and anomalous magnetic…
Proton Lifetime in Minimal Supersymmetric SU(5) with Gauge Mediation
Jason L. Evans, Yoshihiro Shigekami
In this paper, we discuss the predicted proton lifetimes in minimal supersymmetric (SUSY) grand unified theory (GUT) with gauge mediated supersymmetry breaking (GMSB). We f…
Probing CP Violation in Dark Sector through the Electron Electric Dipole Moment
Jia Liu, Yuichiro Nakai, Yoshihiro Shigekami +1
The Two Higgs Doublet Model (2HDM) stands as a promising framework for exploring physics beyond the Standard Model (SM). Within this context, we explore the possibility that the tw…
Light Dilaton in Rare Meson Decays and Extraction of its CP Property
Sudhakantha Girmohanta, Yuichiro Nakai, Yoshihiro Shigekami +1
The dilaton is a pseudo-Nambu-Goldstone boson associated with the spontaneous breaking of scale invariance in a nearly conformal theory, and couples to the trace of the stress-…
A Large Muon EDM from Dark Matter
Kim Siang Khaw, Yuichiro Nakai, Ryosuke Sato +2
We explore a model of dark matter (DM) that can explain the reported discrepancy in the muon anomalous magnetic moment and predict a large electric dipole moment (EDM) of the muon.…
Muon Electric Dipole Moment as a Probe of Flavor-Diagonal CP Violation
Yuichiro Nakai, Ryosuke Sato, Yoshihiro Shigekami
Electric dipole moments (EDMs) of elementary particles are powerful probes of new physics with flavor-diagonal CP violation. The reported discrepancy in the muon anomalous magnetic…
Probing an intrinsically flavorful ALP via tau-lepton flavor physics
Chuan-Xin Cui, Hiroyuki Ishida, Shinya Matsuzaki +1
Any axionlike particle (ALP) intrinsically possesses flavorful couplings to the standard model (SM) fermions arising as a consequence of the right-handed flavor rotation within the…
Higgs flavor phenomenology in a supersymmetric left-right model with parity
Syuhei Iguro, Junichiro Kawamura, Yuji Omura +1
In this paper, we focus on the supersymmetric model with left-right (LR) symmetry, that is especially proposed in our previous work [1]. In this model, there are four Higgs doublet…
Evryscope-South Survey of Upper- and Pre-main Sequence Solar Neighborhood Stars
Nathan W. Galliher, Jeffrey K. Ratzloff, Henry Corbett +5
Using photometric data collected by Evryscope-South, we search for nearby young variable systems on the upper-main sequence (UMS) and pre-main sequence (PMS). The Evryscopes are al…
Signatures of a Flavor Changing Boson in
Shao-Long Chen, Amit Dutta Banik, Zhaofeng Kang +2
Rare meson decays offer an opportunity to probe a light hidden boson. In this work we explore a new channel () followed by a cascade decay of …
New perspective in searching for axion-like particles from flavor physics
Hiroyuki Ishida, Shinya Matsuzaki, Yoshihiro Shigekami
We propose new perspective in searching for axion-like particles (ALPs) from quark and lepton flavor physics: measurements of the time-dependent CP asymmetry in $B^0 \to K_S^0 π^0…
SUSY threshold corrections to quark and lepton mixing inspired by GUT models
Yu Muramatsu, Yoshihiro Shigekami
In the standard model (SM), the Cabibbo-Kobayashi-Maskawa (CKM) matrix is the only origin of flavor violations (FVs). On the other hand, in general, there are a lot of sources of t…
Spontaneous SUSY breaking in natural SO(10) grand unified theory
Nobuhiro Maekawa, Yuji Omura, Yoshihiro Shigekami +1
We propose a simple grand unified theory (GUT) scenario in which supersymmetry (SUSY) is spontaneously broken in visible sector. Our model is based on the GUT model that has been p…
Versus Flavor Changing Neutral Current Induced by the Light Boson
Zhaofeng Kang, Yoshihiro Shigekami
We propose the local model, which minimally retains the local extension for the sake of neutrino phenomenologies, and at the same time presents an invisible gaug…
Flavor physics in the multi-Higgs doublet models induced by the left-right symmetry
Syuhei Iguro, Yu Muramatsu, Yuji Omura +1
In this paper, we discuss the multi-Higgs doublet models, that could be effectively induced by the extended Standard Model (SM). In particular, we focus on the phenomenology in the…
Spontaneous SUSY breaking without R-symmetry in supergravity
Nobuhiro Maekawa, Yuji Omura, Yoshihiro Shigekami +1
We discuss spontaneous supersymmetry (SUSY) breaking in a model with an anomalous symmetry. In this model, the size of the each term in the superpotential is controlled by…
LHCb anomaly and physics in flavored Z models with flavored Higgs doublets
P. Ko, Yuji Omura, Yoshihiro Shigekami +1
We study an extended Standard Model with a gauged U(1) flavor symmetry, motivated not only by the fermion mass hierarchy but also by the excesses in …
Constraints of chromoelectric dipole moments to natural SUSY type sfermion spectrum
Nobuhiro Maekawa, Yu Muramatsu, Yoshihiro Shigekami
We investigate the lower bounds of sfermion masses from the constraints of chromoelectric dipole moments (CEDMs) in the natural SUSY-type sfermion mass spectrum, in which stop mass…