K. Ukai

activity

20002005

most citedThreshold resummation for nonleptonic B meson decays

85 citations · 233 across the 6 of their papers we have counts for

collaborators

7 papers

hep-ph2005★ 31 cited

Branching ratio and CP violation of $B_{s} \to π K$ decays in the perturbative QCD approach

Xian-Qiao Yu, Ying Li, Cai-Dian Lü

In the framework of perturbative QCD approach, we calculate the branching ratio and CP asymmetry for $B_{s}^{0} (B ˉ_{s}) \to π^{\pm} K^{\mp}$ and $B_{s}(\bar{B}_{s})\to π^{0}\bar{K…

hep-ph2002★ 85 cited

Threshold resummation for nonleptonic B meson decays

Hsiang-nan Li, Kazumasa Ukai

We investigate the double logarithmic corrections $α_{s} ln^{2} x$ , x being a parton momentum fraction, in two-body nonleptonic B meson decays in collinear factorization theorem of per…

hep-ph2002★ 55 cited

Branching Ratios of $B \to D_{s} K$ Decays in Perturbative QCD Approach

Cai-Dian Lu, Kazumasa Ukai

The rare decays $B^{0} \to D_{s}^{-} K^{+}$ and $B^{+} \to D_{s}^{+} K ˉ^{0}$ can occur only via annihilation type diagrams in the standard model. We calculate these decays in perturbative QCD…

hep-ph2001★ 22 cited

How well can we predict CP asymmetry in $B \to π π$ , $K π$ decays?

A. I. Sanda, Kazumasa Ukai

Using the perturbative QCD amplitudes for $B \to π π$ and $B \to K π$ , we have performed an extensive study of the parameter space where the theoretical predictions for the branching r…

hep-ph2001★ 18 cited

Model with Gauge Coupling Unification on $S^{1} / (Z_{2} \times Z_{2}^{'})$ Orbifold

N. Haba, T. Kondo, Y. Shimizu +2

We suggest a simple grand unified theory where the fifth dimensional coordinate is compactified on an $S^{1} / (Z_{2} \times Z_{2}^{'})$ orbifold. This model contains additional ${\bf 10 + \o…

hep-ph2001★ 22 cited

Fermion Mass Hierarchy in the Grand Unified Theory on $S_{1} / (Z_{2} \times Z_{2}^{'})$ Orbifold

N. Haba, Y. Shimizu, Tomoharu Suzuki +1

We suggest a simple grand unified theory where the fifth dimensional coordinate is compactified on an $S_{1} / (Z_{2} \times Z_{2}^{'})$ orbifold. This model is based on the supersymmetric fl…

Branching ratio and CP violation of Bs​→πK decays in the perturbative QCD approach

Threshold resummation for nonleptonic B meson decays

Branching Ratios of B→Ds​K Decays in Perturbative QCD Approach

How well can we predict CP asymmetry in B→ππ, Kπ decays?

Model with Gauge Coupling Unification on S1/(Z2​×Z2′​) Orbifold

Fermion Mass Hierarchy in the Grand Unified Theory on S1​/(Z2​×Z2′​) Orbifold

Branching ratio and CP violation of $B_{s} \to π K$ decays in the perturbative QCD approach

Branching Ratios of $B \to D_{s} K$ Decays in Perturbative QCD Approach

How well can we predict CP asymmetry in $B \to π π$ , $K π$ decays?

Model with Gauge Coupling Unification on $S^{1} / (Z_{2} \times Z_{2}^{'})$ Orbifold

Fermion Mass Hierarchy in the Grand Unified Theory on $S_{1} / (Z_{2} \times Z_{2}^{'})$ Orbifold