Kei Yamamoto

activity

20102026

most citedNonreciprocal surface acoustic wave propagation via magneto-rotation coupling

179 citations · 1.8k across the 51 of their papers we have counts for

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29 papers · 1 filter

hep-ph2026

Textures of dimension-six operators in the SMEFT with non-invertible selection rules

Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1

We investigate the flavor structures of dimension-six operators in the Standard Model Effective Field Theory (SMEFT) subject to non-invertible selection rules. In particular, we cl…

hep-ph2022

Determination of Majorana type-phases from the time evolution of lepton numbers

Nicholas J. Benoit, Yuta Kawamura, Saki Hamada +3

We have investigated an approach for determining the Majorana type-phases using the time evolution of lepton family numbers. We show how the second-order time derivative of the exp…

hep-ph2022★ 1 cited

Effective theory for universal seesaw model and FCNC

Takuya Morozumi, Apriadi Salim Adam, Yuta Kawamura +3

We study the quark sector of the universal seesaw model with SU(2) $_{L}$ $\times$ SU(2) $_{R}$ $\times$ $U (1)$ .The model incorporates the seesaw mechanism with the vector-like quarks (V…

hep-ph2022★ 3 cited

Generalized Matter Parities from Finite Modular Symmetries

Tatsuo Kobayashi, Satsuki Nishimura, Hajime Otsuka +2

We classify a supersymmetric extension of the Standard Model by discrete symmetries originating from finite modular symmetries $Γ_{N}$ . Since all the couplings in supersymmetric theo…

hep-ph2022

Lepton flavor violation, lepton $(g - 2)_{μ, e}$ and electron EDM in the modular symmetry

Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1

We study the lepton flavor violation (LFV), the leptonic magnetic moments $(g - 2)_{μ, e}$ and the electric dipole moment (EDM) of the electron in the Standard-Model Effective Fiel…

hep-ph2022★ 1 cited

New Physics Searches at Kaon and Hyperon Factories

Evgueni Goudzovski, Diego Redigolo, Kohsaku Tobioka +61

Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths…

hep-ph2022★ 14 cited

4D modular flavor symmetric models inspired by higher dimensional theory

Shota Kikuchi, Tatsuo Kobayashi, Hajime Otsuka +3

We study a scenario to derive four-dimensional modular flavor symmetric models from higher dimensional theory by assuming the compactification consistent with the modular symmetry.…

hep-ph2021★ 35 cited

Modular symmetry in the SMEFT

Tatsuo Kobayashi, Hajime Otsuka, Morimitsu Tanimoto +1

We study the modular symmetric standard-model effective field theory. We employ the stringy Ansatz on coupling structure that 4-point couplings $y^{(4)}$ of matter fields are writt…

hep-ph2021★ 15 cited

Electron EDM arising from modulus $τ$ in the supersymmetric modular invariant flavor models

Morimitsu Tanimoto, Kei Yamamoto

The electric dipole moment (EDM) of electron is studied in the supersymmetric $A_{4}$ modular invariant theory of flavors with CP invariance. The CP symmetry of the lepton sector…

hep-ph2020★ 79 cited

Flavour symmetries in the SMEFT

Darius A. Faroughy, Gino Isidori, Felix Wilsch +1

We analyse how $U (3)^{5}$ and $U (2)^{5}$ flavour symmetries act on the Standard Model Effective Field Theory, providing an organising principle to classify the large number of dimensio…

hep-ph2019★ 102 cited

With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays

Javier Fuentes-Martín, Gino Isidori, Julie Pagès +1

Motivated by the recent hints of lepton flavor universality violation observed in semileptonic $B$ decays, we analyze how to test flavor and helicity structures of the correspondin…

hep-ph2019★ 1 cited

Simultaneous explanation of $K$ and $B$ anomalies in vectorlike compositeness

Shinya Matsuzaki, Kenji Nishiwaki, Kei Yamamoto

We address the presently reported significant flavor anomalies in the $K$ and $B$ meson systems such as the CP violating Kaon decay ( $ε^{'} / ε$ ) and lepton-flavor universality violatio…

hep-ph2018★ 76 cited

$D^{}$ polarization vs. $R_{D^{()}}$ anomalies in the leptoquark models

Syuhei Iguro, Teppei Kitahara, Yuji Omura +2

Polarization measurements in $B ˉ \to D^{(*)} τ ν$ are useful to check consistency in new physics explanations for the $R_{D}$ and $R_{D^{*}}$ anomalies. In this…

hep-ph2018★ 20 cited

Simultaneous interpretation of $K$ and $B$ anomalies in terms of chiral-flavorful vectors

Shinya Matsuzaki, Kenji Nishiwaki, Kei Yamamoto

We address the presently reported significant flavor anomalies in the Kaon and $B$ meson systems such as the CP violating Kaon decay ( $ε^{'} / ε$ ) and lepton-flavor universality violati…

hep-ph2017★ 68 cited

Gluino-mediated electroweak penguin with flavor-violating trilinear couplings

Motoi Endo, Toru Goto, Teppei Kitahara +3

In light of a discrepancy of the direct $C P$ violation in $K \to π π$ decays, $ε^{'} / ε_{K}$ , we investigate gluino contributions to the electroweak penguin, where flavo…

hep-ph2017★ 10 cited

Probing SUSY effects in $K_{S}^{0} \to μ^{+} μ^{-}$

Veronika Chobanova, Giancarlo D'Ambrosio, Teppei Kitahara +4

We explore supersymmetric contributions to the decay $K_{S}^{0} \to μ^{+} μ^{-}$ , in light of current experimental data. The Standard Model (SM) predicts $\mathcal{B}(K_S^0\rightarrow…

hep-ph2016★ 77 cited

Revisiting Kaon Physics in General $Z$ Scenario

Motoi Endo, Teppei Kitahara, Satoshi Mishima +1

New physics contributions to the $Z$ penguin are revisited in the light of the recently-reported discrepancy of the direct CP violation in $K \to π π$ . Interference effects between th…

hep-ph2016★ 69 cited

Chargino contributions in light of recent $ε^{'} / ε$

Motoi Endo, Satoshi Mishima, Daiki Ueda +1

Recently, the standard model prediction of $ε^{'} / ε$ was improved, and a discrepancy from the experimental results was reported at the $2.9 σ$ level. We study the chargino contribution…

hep-ph2016★ 50 cited

Probing the SUSY with $10$ TeV stop mass in rare decays and CP violation of Kaon

Morimitsu Tanimoto, Kei Yamamoto

We probe the SUSY at the $10 TeV$ scale in the rare decays and the CP violation of the kaon. We focus on the processes of $K_{L} \to π^{0} ν ν ˉ$ and $K^+ \to π^+ ν{\bar ν}…

hep-ph2015

Sensitivity of High-Scale SUSY in Low Energy Hadronic FCNC

Morimitsu Tanimoto, Kei Yamamoto

We discuss the sensitivity of the high-scale SUSY at $10$ - $1000$ TeV in $B^{0}$ , $B_{s}$ , $K^{0}$ and $D$ meson systems together with the neutron EDM and the mercury EDM. In order to est…

hep-ph2015★ 6 cited

$K_{L} \to π^{0} ν ν ˉ$ decay correlating with $ε_{K}$ in high-scale SUSY

Morimitsu Tanimoto, Kei Yamamoto

We have studied the contribution of the high-scale SUSY to the K_L to pi^0 nu{bar nu} and K^+ to pi^+ nu{bar nu} processes correlating with the CP violating parameter epsilon_K. Ta…

hep-ph2015★ 2 cited

Linking Leptonic CP violation to Quark Unitarity Triangle

Morimitsu Tanimoto, Kei Yamamoto

We study the linking between the CP violating phase of the lepton sectors and the unitarity triangle of the B0 meson system. Antusch, King, Malinsky and Spinrath have shown that th…

hep-ph2014★ 34 cited

Predicting CP violation in Deviation from Tri-bimaximal mixing of Neutrinos

Yusuke Shimizu, Morimitsu Tanimoto, Kei Yamamoto

We study the CP violation in the deviation from the tri-bimaximal mixing (TBM) of neutrinos. We examine non-trivial relations among the mixing angles and the CP violating Dirac pha…

hep-ph2014★ 7 cited

Probing the high scale SUSY in CP violations of K, B0 and Bs mesons

Morimitsu Tanimoto, Kei Yamamoto

We probe the high scale SUSY at 10-50 TeV in the CP violations of K, B0 and Bs mesons. In order to estimate the contribution of the squark flavor mixing to these CP violations, we…

Textures of dimension-six operators in the SMEFT with non-invertible selection rules

Determination of Majorana type-phases from the time evolution of lepton numbers

Effective theory for universal seesaw model and FCNC

Generalized Matter Parities from Finite Modular Symmetries

Lepton flavor violation, lepton (g−2)μ,e​ and electron EDM in the modular symmetry

New Physics Searches at Kaon and Hyperon Factories

4D modular flavor symmetric models inspired by higher dimensional theory

Modular symmetry in the SMEFT

Electron EDM arising from modulus τ in the supersymmetric modular invariant flavor models

Flavour symmetries in the SMEFT

With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays

Simultaneous explanation of K and B anomalies in vectorlike compositeness

D∗ polarization vs. RD(∗)​ anomalies in the leptoquark models

Simultaneous interpretation of K and B anomalies in terms of chiral-flavorful vectors

Gluino-mediated electroweak penguin with flavor-violating trilinear couplings

Probing SUSY effects in KS0​→μ+μ−

Revisiting Kaon Physics in General Z Scenario

Chargino contributions in light of recent ε′/ε

Probing the SUSY with 10 TeV stop mass in rare decays and CP violation of Kaon

Sensitivity of High-Scale SUSY in Low Energy Hadronic FCNC

KL​→π0ννˉ decay correlating with εK​ in high-scale SUSY

Linking Leptonic CP violation to Quark Unitarity Triangle

Predicting CP violation in Deviation from Tri-bimaximal mixing of Neutrinos

Probing the high scale SUSY in CP violations of K, B0 and Bs mesons

Lepton flavor violation, lepton $(g - 2)_{μ, e}$ and electron EDM in the modular symmetry

Electron EDM arising from modulus $τ$ in the supersymmetric modular invariant flavor models

Simultaneous explanation of $K$ and $B$ anomalies in vectorlike compositeness

$D^{}$ polarization vs. $R_{D^{()}}$ anomalies in the leptoquark models

Simultaneous interpretation of $K$ and $B$ anomalies in terms of chiral-flavorful vectors

Probing SUSY effects in $K_{S}^{0} \to μ^{+} μ^{-}$

Revisiting Kaon Physics in General $Z$ Scenario

Chargino contributions in light of recent $ε^{'} / ε$

Probing the SUSY with $10$ TeV stop mass in rare decays and CP violation of Kaon

$K_{L} \to π^{0} ν ν ˉ$ decay correlating with $ε_{K}$ in high-scale SUSY