T. Kitahara

activity

20122026

most citedImpact of polarization observables and

B_{c} \to τ ν

on new physics explanations of the

b \to c τ ν

anomaly

130 citations · 2.1k across the 68 of their papers we have counts for

collaborators

69 papers

hep-th2026

On-Shell Amplitudes and Black-Hole Perturbations: Exact Reissner-Nordström Mixing

Kento Takahara, Teppei Kitahara

Can flat-space on-shell amplitudes determine the channel basis of a coupled black-hole perturbation problem? We address this question for electromagnetic and gravitational perturba…

hep-ph2026★ 1 cited

Full Three-Loop Electroweak Multiplet Contributions to the Electron Electric Dipole Moment

Tatsuya Banno, Junji Hisano, Teppei Kitahara +2

Experimental sensitivity to the electric dipole moment (EDM) of the electron has improved remarkably in recent years. Consequently, future prospects could probe new physics whose c…

hep-ph2025

Complete one-loop QED corrections to $D_{s}^{+}$ leptonic decays and impact on the CKM unitarity test

Teppei Kitahara, Jun Miyamoto, Kota Sasaki

Recently, a violation of the CKM unitarity condition has been reported in the latest charm-meson data and the latest lattice results, once the universal electroweak correction is t…

hep-ph2025★ 3 cited

Discriminating Tauphilic Leptoquark Explanations of the $B$ Anomalies via $K \to π ν ν ˉ$ and $B \to K ν ν ˉ$

Andreas Crivellin, Syuhei Iguro, Teppei Kitahara

Leptoquark models are prime candidates for new physics (NP) explanations of the long-standing anomalies in semi-leptonic $B$ decays; $b \to c τ ν ˉ$ (encoded in $R (D^{(*)})$ ) an…

hep-ph2025★ 2 cited

Two-loop corrections to QCD $θ$ angle from evanescent operator in the BMHV scheme

Tatsuya Banno, Junji Hisano, Teppei Kitahara +2

We study the renormalization of the QCD $θ$ angle at the two-loop level focusing on divergent and finite $C P$ -violating contributions from evanescent operators, using dimensional r…

hep-ph2025★ 6 cited

Light scalar beyond the Higgs mixing limit

Cédric Delaunay, Teppei Kitahara, Yotam Soreq +1

We explore the possibility that the interactions of a light scalar singlet, which mixes with the Standard Model~(SM) Higgs, also receive other UV contributions of comparable size.…

hep-ph2024★ 3 cited

Impact of the Electroweak Weinberg Operator on the Electric Dipole Moment of Electron

Tatsuya Banno, Junji Hisano, Teppei Kitahara +2

Recent progresses in the measurements of the electric dipole moment (EDM) of the electron using the paramagnetic atom or molecule are remarkable. In this paper, we calculate a cont…

hep-ph2024★ 4 cited

Theoretical point of view on Cabibbo angle anomaly

Teppei Kitahara

We present the current situation of the determinations of the first-row CKM components and show the Cabibbo angle anomaly corresponding to a deficit in the first-row CKM unitarity…

hep-ph2024★ 32 cited

Global fit to $b \to c τ ν$ anomalies as of Spring 2024

Syuhei Iguro, Teppei Kitahara, Ryoutaro Watanabe

Recently, several new experimental results of the test of lepton flavor universality (LFU) in $B \to D^{(*)}$ semi-leptonic decays were announced: the first result of $R_{D}$ fro…

hep-ph2023★ 11 cited

Closer look at the matching condition for radiative QCD $θ$ parameter

Tatsuya Banno, Junji Hisano, Teppei Kitahara +1

In this paper, we scrutinize a radiatively generated QCD $θ$ parameter at the two-loop level based on both full analytical loop functions with the Fock-Schwinger gauge method and t…

hep-ph2023★ 4 cited

MeV Sterile Neutrino in light of the Cabibbo-Angle Anomaly

Teppei Kitahara, Kohsaku Tobioka

A modified neutrino sector could imprint a signature on precision measurements of the quark sector because many such measurements rely on the semi-leptonic decays of the charged cu…

hep-ph2023★ 3 cited

Electric Dipole Moments as Probes of $B$ Anomaly

Syuhei Iguro, Teppei Kitahara

The measurements of the lepton flavor universality (LFU) in $B (B ˉ \to D^{(*)} l ν ˉ)$ indicate a significant deviation from the standard model prediction at a…

hep-ph2023★ 9 cited

Current Status of the Muon g-2 Interpretations within Two-Higgs-Doublet Models

Syuhei Iguro, Teppei Kitahara, Martin S. Lang +1

In this article, we review and update implications of the muon anomalous magnetic moment (muon $g - 2$ ) anomaly for two-Higgs-doublet models (2HDMs), which are classified according t…

hep-ph2023★ 30 cited

Asymmetric di-Higgs signals of the next-to-minimal 2HDM with a $U (1)$ symmetry

Sumit Banik, Andreas Crivellin, Syuhei Iguro +1

The two-Higgs-doublet model with a $U (1)_{H}$ gauge symmetry (N2HDM- $U (1)$ ) has several advantages compared to the ``standard'' $Z_{2}$ version (N2HDM- $Z_{2}$ ): It is purely based on gau…

hep-ph2023★ 19 cited

Novel loop-diagrammatic approach to QCD $θ$ parameter and application to the left-right model

Junji Hisano, Teppei Kitahara, Naohiro Osamura +1

When the QCD axion is absent in full theory, the strong $C P$ problem has to be explained by an additional mechanism, e.g., the left-right symmetry. Even though tree-level QCD $\bar…

hep-ph2022★ 43 cited

Global Fit of Modified Quark Couplings to EW Gauge Bosons and Vector-Like Quarks in Light of the Cabibbo Angle Anomaly

Andreas Crivellin, Matthew Kirk, Teppei Kitahara +1

There are two tensions related to the Cabibbo angle of the CKM matrix. First, the determinations of $V_{u s}$ from $K_{μ 2}$ , $K_{ℓ 3}$ , and $τ$ decays disagree at the $3 σ$ level.…

hep-ph2022★ 44 cited

Impact of $Λ_{b} \to Λ_{c} τ ν$ measurement on New Physics in $b \to c l ν$ transitions

Marco Fedele, Monika Blanke, Andreas Crivellin +4

Measurements of the branching ratios of $B \to D^{(*)} τ ν ˉ / B \to D^{(*)} ℓ ν ˉ$ and $B_{c} \to J / ψ τ ν ˉ / B_{c} \to J / ψ ℓ ν ˉ$ by the BaBar, Belle and LHCb collaborations co…

hep-ph2022★ 10 cited

A Precision Relation between $Γ (K \to μ^{+} μ^{-}) (t)$ and $B (K_{L} \to μ^{+} μ^{-}) / B (K_{L} \to γ γ)$

Avital Dery, Mitrajyoti Ghosh, Yuval Grossman +2

We find that the phase appearing in the unitarity relation between $B (K_{L} \to μ^{+} μ^{-})$ and $B (K_{L} \to γ γ)$ is equal to the phase shift in the inte…

hep-ph2022★ 20 cited

Chasing the two-Higgs doublet model in the di-Higgs production

Syuhei Iguro, Teppei Kitahara, Yuji Omura +1

We investigate the di-Higgs production at the Large Hadron Collider in the two-Higgs doublet model (2HDM). In particular, we study the production of an extra neutral Higgs boson $ϕ…

hep-ph2022★ 27 cited

Self-consistent extraction of spectroscopic bounds on light new physics

Cédric Delaunay, Jean-Philippe Karr, Teppei Kitahara +3

Fundamental physical constants are determined from a collection of precision measurements of elementary particles, atoms and molecules. This is usually done under the assumption of…

hep-ph2022

Report of the Topical Group on Physics Beyond the Standard Model at Energy Frontier for Snowmass 2021

Tulika Bose, Antonio Boveia, Caterina Doglioni +318

This is the Snowmass2021 Energy Frontier (EF) Beyond the Standard Model (BSM) report. It combines the EF topical group reports of EF08 (Model-specific explorations), EF09 (More gen…

hep-ph2022★ 11 cited

Global fit to $b \to c τ ν$ anomalies 2022 mid-autumn

Syuhei Iguro, Teppei Kitahara, Ryoutaro Watanabe

Recently, the LHCb collaboration announced a preliminary result of the test of lepton flavor universality (LFU) in $B \to D^{(*)}$ semi-leptonic decays: $R_{D}^{\rm LHCb2022} = 0…

hep-ph2022★ 2 cited

Theory Techniques for Precision Physics -- Snowmass 2021 TF06 Topical Group Report

Radja Boughezal, Zoltan Ligeti, Wolfgang Altmannshofer +26

The wealth of experimental data collected at laboratory experiments suggests that there is some scale separation between the Standard Model (SM) and phenomena beyond the SM (BSM).…

hep-th2022★ 16 cited

Monopole-fermion scattering and varying Fock space

Yuta Hamada, Teppei Kitahara, Yoshiki Sato

We propose a four-dimensional interpretation of the outgoing state of the scattering of a massless fermion off a Dirac monopole. It has been known that such a state has fractional…

On-Shell Amplitudes and Black-Hole Perturbations: Exact Reissner-Nordström Mixing

Full Three-Loop Electroweak Multiplet Contributions to the Electron Electric Dipole Moment

Complete one-loop QED corrections to Ds+​ leptonic decays and impact on the CKM unitarity test

Discriminating Tauphilic Leptoquark Explanations of the B Anomalies via K→πννˉ and B→Kννˉ

Two-loop corrections to QCD θ angle from evanescent operator in the BMHV scheme

Light scalar beyond the Higgs mixing limit

Impact of the Electroweak Weinberg Operator on the Electric Dipole Moment of Electron

Theoretical point of view on Cabibbo angle anomaly

Global fit to b→cτν anomalies as of Spring 2024

Closer look at the matching condition for radiative QCD θ parameter

MeV Sterile Neutrino in light of the Cabibbo-Angle Anomaly

Electric Dipole Moments as Probes of B Anomaly

Current Status of the Muon g-2 Interpretations within Two-Higgs-Doublet Models

Asymmetric di-Higgs signals of the next-to-minimal 2HDM with a U(1) symmetry

Novel loop-diagrammatic approach to QCD θ parameter and application to the left-right model

Global Fit of Modified Quark Couplings to EW Gauge Bosons and Vector-Like Quarks in Light of the Cabibbo Angle Anomaly

Impact of Λb​→Λc​τν measurement on New Physics in b→clν transitions

A Precision Relation between Γ(K→μ+μ−)(t) and B(KL​→μ+μ−)/B(KL​→γγ)

Chasing the two-Higgs doublet model in the di-Higgs production

Self-consistent extraction of spectroscopic bounds on light new physics

Report of the Topical Group on Physics Beyond the Standard Model at Energy Frontier for Snowmass 2021

Global fit to b→cτν anomalies 2022 mid-autumn

Theory Techniques for Precision Physics -- Snowmass 2021 TF06 Topical Group Report

Monopole-fermion scattering and varying Fock space

Complete one-loop QED corrections to $D_{s}^{+}$ leptonic decays and impact on the CKM unitarity test

Discriminating Tauphilic Leptoquark Explanations of the $B$ Anomalies via $K \to π ν ν ˉ$ and $B \to K ν ν ˉ$

Two-loop corrections to QCD $θ$ angle from evanescent operator in the BMHV scheme

Global fit to $b \to c τ ν$ anomalies as of Spring 2024

Closer look at the matching condition for radiative QCD $θ$ parameter

Electric Dipole Moments as Probes of $B$ Anomaly

Asymmetric di-Higgs signals of the next-to-minimal 2HDM with a $U (1)$ symmetry

Novel loop-diagrammatic approach to QCD $θ$ parameter and application to the left-right model

Impact of $Λ_{b} \to Λ_{c} τ ν$ measurement on New Physics in $b \to c l ν$ transitions

A Precision Relation between $Γ (K \to μ^{+} μ^{-}) (t)$ and $B (K_{L} \to μ^{+} μ^{-}) / B (K_{L} \to γ γ)$

Global fit to $b \to c τ ν$ anomalies 2022 mid-autumn