Syuhei Iguro

activity

20172026

most cited

R (D^{(*)})

in a general two Higgs doublet model

159 citations · 1.2k across the 56 of their papers we have counts for

collaborators

58 papers

hep-ph2026

Flavor-resolved four-fermion probes at the FCC-ee $Z$ pole

Syuhei Iguro

The electron-positron Future Circular Collider will provide an unprecedented opportunity for precision studies at the $Z$ pole. In addition to improving the electroweak measurement…

hep-ph2026

Endpoint anatomy of the baryon--meson sum rule in $b \to s ν ν ˉ$

Syuhei Iguro

Baryon-meson sum rules enable cross-checks among exclusive mesonic and baryonic measurements. Unlike their heavy-to-heavy counterparts, analogous heavy-to-light relations lack an e…

hep-ph2026

$∣ V_{c b} ∣$ determinations from $B ˉ \to D^{(*)} ℓ ν ˉ$ decays within the SM and beyond

Wen-Sheng Fang, Syuhei Iguro, Xin-Qiang Li +3

We investigate the $∣ V_{c b} ∣$ determinations from exclusive semi-leptonic $B ˉ \to D^{(*)} ℓ ν ˉ$ decays, together with comprehensive Bayesian fit analyses of the $\bar{B} \…

hep-ph2026

Semileptonic sum rules in heavy-to-light charm decays

Motoi Endo, Syuhei Iguro, Satoshi Mishima +2

We investigate semileptonic sum rules in heavy-to-light charm decays, motivated by analogous relations in $b \to c$ and $b \to u$ transitions. Focusing on the $c \to d\overline{\el…

hep-ph2026

$b \to c$ semileptonic sum rule: SU(3) $_{F}$ symmetry violation

Syuhei Iguro

To clarify possible deviations in $b \to c τ ν$ processes, the $b \to c$ semileptonic sum rule provides a valuable tool. This relation, derived based on heavy quark symmetry (…

hep-ph2026

$b \to c$ semileptonic sum rule: orbitally excited hadrons

Motoi Endo, Syuhei Iguro, Satoshi Mishima

We study semileptonic sum rules for $b \to c τ ν$ transitions involving orbitally excited charm hadrons. Starting from the amplitude-level relation implied by the heavy qua…

hep-ph2026

$b \to c$ semileptonic sum rule: exploring a sterile neutrino loophole

Motoi Endo, Syuhei Iguro, Tim Kretz +1

We investigate the $b \to c$ semileptonic sum rule in the presence of a massive sterile neutrino. Recent measurements of charged-current semitauonic $B$ -meson decays exhibit a $\sim…

hep-ph2025

Chasing the two-Higgs-doublet model via electroweak corrections at $e^{+} e^{-}$ colliders

Pia Bredt, Tatsuya Banno, Marius Höfer +5

We present a comprehensive study of Higgs boson production associated with a neutrino pair at $e^{+} e^{-}$ colliders ( $e^{+} e^{-} \to h ν ν ˉ$ ) at next-to-leading-order accuracy in bo…

hep-ph2025

Constructing heavy-quark sum rule for $b \to c$ meson and baryon decays

Motoi Endo, Syuhei Iguro, Satoshi Mishima +1

We study heavy-hadron semileptonic decays proceeding via $b \to c$ transition, such as $B \to D^{(*)} τ ν ˉ_{τ}$ and $Λ_{b} \to Λ_{c} τ ν ˉ_{τ}$ . In the heavy-quark limit, where the heavy-…

hep-ph2025

$b \to c$ semileptonic sum rule: Current status and prospects

Motoi Endo, Syuhei Iguro, Satoshi Mishima +1

The $b \to c$ semileptonic sum rules provide relations between the decay rates of $B \to D^{(*)} τ ν ˉ$ and $Λ_{b} \to Λ_{c} τ ν ˉ$ . Starting from the heavy quark and zero-recoil lim…

hep-ph2025

Searching for Di-Higgs Signatures of Light Charged Scalars

Guglielmo Coloretti, Andreas Crivellin, Syuhei Iguro

The excess in $t \to b b c$ observed by ATLAS points towards a charged Higgs boson with a mass around 130GeV, consistent with the expectations from the $B$ anomalies, i…

hep-ph2025

$b \to c$ semileptonic sum rule: Extension to angular observables

Motoi Endo, Syuhei Iguro, Tim Kretz +2

Lepton flavor universality is a key prediction of the Standard Model of particle physics and any violation of it immediately indicates the existence of new physics. Given the recen…

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

Kaon Physics: A Cornerstone for Future Discoveries

Jason Aebischer, Atakan Tugberk Akmete, Riccardo Aliberti +153

The kaon physics programme, long heralded as a cutting-edge frontier by the European Strategy for Particle Physics, continues to stand at the intersection of discovery and innovati…

hep-ph2025

Heavy quark symmetry behind $b \to c$ semileptonic sum rule

Motoi Endo, Syuhei Iguro, Satoshi Mishima +1

Lepton flavor universality violations in semileptonic $b \to c$ transitions have garnered attention over a decade. For $R_{H_c}={\rm{BR}}(H_b\to H_c τ\barν_τ)/{\rm{BR}}(H_b\to H_c…

hep-ph2024

Cosmology-Independent Constraints on Irreducible Magnetic Monopole Background

Syuhei Iguro, Varun Mathur, Ian M. Shoemaker +1

We present a novel mechanism for the irreducible production of magnetic monopoles from interactions of cosmic rays and interstellar medium (ISM). Resulting monopoles drain energy f…

hep-ph2024★ 1 cited

Global fit to the 2HDM with generic sources of flavour violation using \textsf{GAMBIT}

Peter Athron, Andreas Crivellin, Tomás E. Gonzalo +2

We perform a global statistical analysis of the two-Higgs-doublet model with generic sources of flavour violation using \textsf{GAMBIT}. This is particularly interesting in light o…

hep-ph2024★ 11 cited

On sum rules for semi-leptonic $b \to c$ and $b \to u$ decays

Wen-Feng Duan, Syuhei Iguro, Xin-Qiang Li +2

The semi-leptonic $b \to c l ν$ processes are receiving a lot of attention, as the lepton flavor universality violation has been hinted by the measured ratios $R_{D^{(*)}} = Γ(B \t…

hep-ph2024

$SU (3)_{F}$ sum rules for CP asymmetry of $D_{(s)}$ decays

Syuhei Iguro, Ulrich Nierste, Emil Overduin +1

Charge-parity (CP) asymmetries in charm decays are extremely suppressed in the Standard Model and may well be dominated by new physics contributions. The LHCb collaboration reporte…

hep-ph2024

Determining Weak-Mixing Angle at $μ$ TRISTAN

Lisong Chen, Syuhei Iguro, Yu Hamada

$μ$ TRISTAN is a realistic high energy lepton collider based on the existing technology aiming at indirect and direct search for the physics beyond the standard model (SM). We propo…

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

Accumulating Hints for Flavour Violating Higgses at the Electroweak Scale

Andreas Crivellin, Syuhei Iguro

We show that supplementing the Standard Model by only a second Higgs doublet, a combined explanation of $h \to e τ$ , $h \to μτ$ , $b \to s ℓ^{+} ℓ^{-}$ , the $W$ mass and $R({D^{(*)}})…

hep-ph2023

Light mass window of inert doublet dark matter with lepton portal interaction

Ryo Higuchi, Syuhei Iguro, Shohei Okawa +1

We study phenomenology of a light scalar dark matter (DM). In the model, there are an inert doublet scalar and a singlet Dirac fermion $ψ$ , both charged under a global $Z_{2}$ symmet…

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…

Flavor-resolved four-fermion probes at the FCC-ee Z pole

Endpoint anatomy of the baryon--meson sum rule in b→sννˉ

∣Vcb​∣ determinations from Bˉ→D(∗)ℓνˉ decays within the SM and beyond

Semileptonic sum rules in heavy-to-light charm decays

b→c semileptonic sum rule: SU(3)F​ symmetry violation

b→c semileptonic sum rule: orbitally excited hadrons

b→c semileptonic sum rule: exploring a sterile neutrino loophole

Chasing the two-Higgs-doublet model via electroweak corrections at e+e− colliders

Constructing heavy-quark sum rule for b→c meson and baryon decays

b→c semileptonic sum rule: Current status and prospects

Searching for Di-Higgs Signatures of Light Charged Scalars

b→c semileptonic sum rule: Extension to angular observables

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

Kaon Physics: A Cornerstone for Future Discoveries

Heavy quark symmetry behind b→c semileptonic sum rule

Cosmology-Independent Constraints on Irreducible Magnetic Monopole Background

Global fit to the 2HDM with generic sources of flavour violation using \textsf{GAMBIT}

On sum rules for semi-leptonic b→c and b→u decays

SU(3)F​ sum rules for CP asymmetry of D(s)​ decays

Determining Weak-Mixing Angle at μTRISTAN

Global fit to b→cτν anomalies as of Spring 2024

Accumulating Hints for Flavour Violating Higgses at the Electroweak Scale

Light mass window of inert doublet dark matter with lepton portal interaction

Electric Dipole Moments as Probes of B Anomaly

Flavor-resolved four-fermion probes at the FCC-ee $Z$ pole

Endpoint anatomy of the baryon--meson sum rule in $b \to s ν ν ˉ$

$∣ V_{c b} ∣$ determinations from $B ˉ \to D^{(*)} ℓ ν ˉ$ decays within the SM and beyond

$b \to c$ semileptonic sum rule: SU(3) $_{F}$ symmetry violation

$b \to c$ semileptonic sum rule: orbitally excited hadrons

$b \to c$ semileptonic sum rule: exploring a sterile neutrino loophole

Chasing the two-Higgs-doublet model via electroweak corrections at $e^{+} e^{-}$ colliders

Constructing heavy-quark sum rule for $b \to c$ meson and baryon decays

$b \to c$ semileptonic sum rule: Current status and prospects

$b \to c$ semileptonic sum rule: Extension to angular observables

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

Heavy quark symmetry behind $b \to c$ semileptonic sum rule

On sum rules for semi-leptonic $b \to c$ and $b \to u$ decays

$SU (3)_{F}$ sum rules for CP asymmetry of $D_{(s)}$ decays

Determining Weak-Mixing Angle at $μ$ TRISTAN

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

Electric Dipole Moments as Probes of $B$ Anomaly