Hiroyuki Umeeda

activity

20132026

most cited

D

meson mixing as an inverse problem

41 citations · 134 across the 23 of their papers we have counts for

collaborators

24 papers

hep-ph2026

Polarized observables in $τ \to V V ν_{τ}$ decays

Vindhyawasini Prasad, Hiroyuki Umeeda

We study polarization observables in $τ^{-} \to V_{1}^{-} V_{2}^{0} ν_{τ}$ decays for $(V_{1}^{-}, V_{2}^{0}) = (ρ^{-}, ρ^{0}), (ρ^{-}, ω), (K^{*-}, ρ^{0}), (K^{*-}, ω), (ρ^{-}, K ˉ^{* 0})$ using the helicity…

hep-ph2026

$b \to c u ˉ q$ decay and CP violating observables in the presence of new physics contributions

Xuanning Guo, Albertus Hariwangsa Panuluh, Hiroyuki Umeeda +1

In this work, a comprehensive analysis for processes related to $b \to c u ˉ q (q = d, s)$ transitions are carried out, including new physics contributions. In light of a recent ten…

hep-ph2025

$D^{0} - D ˉ^{0}$ mixing in the Dyson-Schwinger approach

Xiaotong Xie, Hiroyuki Umeeda, Jinglong Zhu

In view of difficulty to reproduce observables in the $D^{0} - D ˉ^{0}$ mixing via the operator product expansion, we discuss the Dyson-Schwinger approach to this process. Formulated…

hep-ph2024

$B \to X_{c} ℓ ν ˉ$ Decay as a Probe of Complex Conjugate Poles

Jinglong Zhu, Hiroyuki Umeeda

In this work, nontrivial analytic structure of the quark propagator is discussed for $B$ -meson inclusive decays. Attributed to invalidity of the standard Källén-Lehman spectral rep…

hep-ph2024

$B_{(s)} \to D_{(s)}^{(*)} M$ decays in the presence of final-state interaction

Albertus Hariwangsa Panuluh, Satoshi Tanaka, Hiroyuki Umeeda

In light of the recent data for $B ˉ_{(s)} \to D_{(s)}^{(*)} P$ and $B ˉ_{(s)} \to D_{(s)} V$ decays, we perform a model-independent phenomenological analysis in the presence o…

hep-ph2022★ 3 cited

Is right-handed current contribution to $B ˉ \to X_{u} l ν$ decays corrected by non-trivial vacuum in QCD?

Hiroyuki Umeeda

We study violation of quark-hadron duality for $B ˉ \to X_{u} l ν$ and $D \to X_{d} l ν$ decays in the presence of the right-handed current operator. For this case, we show that duality…

hep-ph2022

Theoretical aspects of $D^{0} - D ˉ^{0}$ mixing

Hiroyuki Umeeda

Observables in the $D^{0} - D ˉ^{0}$ mixing can be theoretically analyzed by the operator product expansion (OPE), in which $1/ m_{c}$ is regarded as an expansion parameter. Since the c…

hep-ph2021★ 4 cited

Revisiting quark-hadron duality for heavy meson non-leptonic decays in two-dimensional QCD

Hiroyuki Umeeda

We study lifetimes of heavy mesons in the 't Hooft model, a large- $N_{c}$ theory of strong interaction in two-dimensional spacetime. Since this model is solvable, one can evaluate th…

hep-ph2021★ 6 cited

Quark-hadron duality for heavy meson mixings in the 't Hooft model

Hiroyuki Umeeda

We study local quark-hadron duality and its violation for the $D^{0} - D ˉ^{0}$ , $B_{d}^{0} - B ˉ_{d}^{0}$ and $B_{s}^{0} - B ˉ_{s}^{0}$ mixings in the 't Hooft model, offering a laboratory to t…

hep-ph2020★ 21 cited

QCD sum rules with spectral densities solved in inverse problems

Hsiang-nan Li, Hiroyuki Umeeda

We construct QCD sum rules for nonperturbative studies without assuming the quark-hadron duality for the spectral density at low energy on the hadron side. Instead, both resonance…

hep-ph2020★ 11 cited

Vacuum polarization contribution to muon $g - 2$ as an inverse problem

Hsiang-nan Li, Hiroyuki Umeeda

We analyze the electromagnetic current correlator at an arbitrary photon invariant mass $q^{2}$ by exploiting its associated dispersion relation. The dispersion relation is turned in…

hep-ph2020★ 41 cited

$D$ meson mixing as an inverse problem

Hsiang-nan Li, Hiroyuki Umeeda, Fanrong Xu +1

We calculate the parameters $x$ and $y$ for the $D$ meson mixing in the Standard Model by considering a dispersion relation between them. The dispersion relation for a fictitious c…

hep-ph2019★ 2 cited

Hidden relations in three generation seesaw model with Dirac mass matrix of four-zero texture

Takuya Morozumi, Yusuke Shimizu, Hiroyuki Umeeda +1

We present predictions for CP violating phases of the Type-I seesaw model with four-zero textures on the Dirac mass matrix. For the four-zero textures, the effective low energy Maj…

hep-ph2018★ 9 cited

Direct CP Violation in Cabibbo-Favored Charmed Meson Decays and $ε^{'} / ε$ in $S U (2)_{L} \times S U (2)_{R} \times U (1)_{B - L}$ Model

Naoyuki Haba, Hiroyuki Umeeda, Toshifumi Yamada

Since the standard model contribution is virtually absent, any observation of direct CP violation in the Cabibbo-favored charmed meson decays would be evidence of new physics. In t…

hep-ph2018★ 17 cited

$ε^{'} / ε$ Anomaly and Neutron EDM in $S U (2)_{L} \times S U (2)_{R} \times U (1)_{B - L}$ model with Charge Symmetry

Naoyuki Haba, Hiroyuki Umeeda, Toshifumi Yamada

The Standard Model prediction for $ε^{'} / ε$ based on recent lattice QCD results exhibits a tension with the experimental data. We solve this tension through $W_{R}^{+}$ gauge boson exchan…

hep-ph2018★ 5 cited

Effective theory analysis for vector-like quark model

Takuya Morozumi, Yusuke Shimizu, Shunya Takahashi +1

We study a model with a down-type SU(2) singlet vector-like quark (VLQ) as a minimal extension of the standard model (SM). In this model, flavor changing neutral currents (FCNCs) a…

hep-ph2017★ 3 cited

Semi-aligned two Higgs doublet model

Naoyuki Haba, Hiroyuki Umeeda, Toshifumi Yamada

In the left-right symmetric model based on $S U (2)_{L} \times S U (2)_{R} \times U (1)_{B - L}$ gauge symmetry, there appear heavy neutral scalar particles mediating quark flavor changing neut…

hep-ph2017

Phenomenological Aspects of Possible Vacua of a Neutrino Flavor Model

Takuya Morozumi, Hideaki Okane, Hiroki Sakamoto +3

We discuss a supersymmetric model with discrete flavor symmetry $A_{4} \times Z_{3}$ . The additional scalar fields which contribute masses of leptons in the Yukawa terms are introduced…

hep-ph2016★ 5 cited

Analysis of Dalitz decays with intrinsic parity violating interactions in resonance chiral perturbation theory

Daiji Kimura, Takuya Morozumi, Hiroyuki Umeeda

Observables of light hadron decays are analyzed in a model of chiral Lagrangian which includes resonance fields of vector mesons. In particular, transition form factors are investi…

hep-ph2015

Study of anomalous tau lepton decay using chiral Lagrangian with vector mesons

Takuya Morozumi, Hiroyuki Umeeda, Daiji Kimura

An intrinsic parity violating hadronic tau lepton decay is investigated. $τ \to π π η ν$ is the process in which the dominant contribution to the amplitude is due to the intrinsic pari…

hep-ph2015

Precise discussion on T-asymmetry with B-meson decays

Hiroyuki Umeeda, Takuya Morozumi, Hideaki Okane

Through $B B ˉ$ mixing system, one can construct an asymmetry which naively seems to be a time reversal (T) odd quantity. In this article, the two processes $(\mathrm{a})\: B_-\…

hep-ph2014

Study of an anomalous tau lepton decay using a chiral Lagrangian with vector mesons

Daiji Kimura, Takuya Morozumi, Hiroyuki Umeeda

The hadronic tau decay $τ^{-} \to ν_{τ} η π^{-} π^{0}$ occurs through V-A weak current. In this decay mode, the vector current contribution is intrinsic parity violating and the axial curren…

hep-ph2014

Precise Discussion of Time-Reversal Asymmetries in B-meson decays

Takuya Morozumi, Hideaki Okane, Hiroyuki Umeeda

BaBar collaboration announced that they observed time reversal (T) asymmetry through $B$ meson system. In the experiment, time dependencies of two distinctive processes, $B_- \righ…

hep-ph2013★ 7 cited

Quark sector CP violation of the universal seesaw model

Ryomu Kawasaki, Takuya Morozumi, Hiroyuki Umeeda

We study the CP violation of universal seesaw model, especially its quark sector. The model is based on SU(2)_L \times SU(2)_R \times U(1)_{Y^\prime}. In order to count the number…

Polarized observables in τ→VVντ​ decays

b→cuˉq decay and CP violating observables in the presence of new physics contributions

D0−Dˉ0 mixing in the Dyson-Schwinger approach

B→Xc​ℓνˉ Decay as a Probe of Complex Conjugate Poles

B(s)​→D(s)(∗)​M decays in the presence of final-state interaction

Is right-handed current contribution to Bˉ→Xu​lν decays corrected by non-trivial vacuum in QCD?

Theoretical aspects of D0−Dˉ0 mixing

Revisiting quark-hadron duality for heavy meson non-leptonic decays in two-dimensional QCD

Quark-hadron duality for heavy meson mixings in the 't Hooft model

QCD sum rules with spectral densities solved in inverse problems

Vacuum polarization contribution to muon g−2 as an inverse problem

D meson mixing as an inverse problem

Hidden relations in three generation seesaw model with Dirac mass matrix of four-zero texture

Direct CP Violation in Cabibbo-Favored Charmed Meson Decays and ε′/ε in SU(2)L​×SU(2)R​×U(1)B−L​ Model

ε′/ε Anomaly and Neutron EDM in SU(2)L​×SU(2)R​×U(1)B−L​ model with Charge Symmetry

Effective theory analysis for vector-like quark model

Semi-aligned two Higgs doublet model

Phenomenological Aspects of Possible Vacua of a Neutrino Flavor Model

Analysis of Dalitz decays with intrinsic parity violating interactions in resonance chiral perturbation theory

Study of anomalous tau lepton decay using chiral Lagrangian with vector mesons

Precise discussion on T-asymmetry with B-meson decays

Study of an anomalous tau lepton decay using a chiral Lagrangian with vector mesons

Precise Discussion of Time-Reversal Asymmetries in B-meson decays

Quark sector CP violation of the universal seesaw model

Polarized observables in $τ \to V V ν_{τ}$ decays

$b \to c u ˉ q$ decay and CP violating observables in the presence of new physics contributions

$D^{0} - D ˉ^{0}$ mixing in the Dyson-Schwinger approach

$B \to X_{c} ℓ ν ˉ$ Decay as a Probe of Complex Conjugate Poles

$B_{(s)} \to D_{(s)}^{(*)} M$ decays in the presence of final-state interaction

Is right-handed current contribution to $B ˉ \to X_{u} l ν$ decays corrected by non-trivial vacuum in QCD?

Theoretical aspects of $D^{0} - D ˉ^{0}$ mixing

Vacuum polarization contribution to muon $g - 2$ as an inverse problem

$D$ meson mixing as an inverse problem

Direct CP Violation in Cabibbo-Favored Charmed Meson Decays and $ε^{'} / ε$ in $S U (2)_{L} \times S U (2)_{R} \times U (1)_{B - L}$ Model

$ε^{'} / ε$ Anomaly and Neutron EDM in $S U (2)_{L} \times S U (2)_{R} \times U (1)_{B - L}$ model with Charge Symmetry