A5016080207- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Ga2O3 and related materials
- Parallel Computing and Optimization Techniques
- Copper-based nanomaterials and applications
- ZnO doping and properties
- Robotics and Sensor-Based Localization
- 3D Surveying and Cultural Heritage
- Medical Imaging Techniques and Applications
- Optical measurement and interference techniques
- Astrophysics and Cosmic Phenomena
Korea University
2008-2023
Jožef Stefan Institute
2015
University of Giessen
2013
Gifu University
2013
University of the Basque Country
2013
University of Cincinnati
2013
University of Bonn
2013
Kyungpook National University
2012
We report a measurement of the process $\ensuremath{\gamma}{\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}$ with $759\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample recorded Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. The pion transition form factor, $F({Q}^{2})$, is measured for kinematical region $4\text{ }{\mathrm{GeV}}^{2}\ensuremath{\lesssim}{Q}^{2}\ensuremath{\lesssim}40\text{ }{\mathrm{GeV}}^{2}$, where...
We report the first observations of spin-singlet bottomonium states hb(1P) and hb(2P). The are produced in reaction e+e−→hb(nP)π+π− using a 121.4 fb−1 data sample collected at energies near Υ(5S) resonance with Belle detector KEKB asymmetric-energy e+e− collider. determine M[hb(1P)]=(9898.2+1.1+1.0−1.0−1.1) MeV/c2 M[hb(2P)]=(10 259.8±0.6+1.4−1.0) MeV/c2, which correspond to P-wave hyperfine splittings ΔMHF=(+1.7±1.5) (+0.5+1.6−1.2) respectively. significances hb(2P) 5.5σ 11.2σ, find that...
We report a study of $B\to (J/\psi \gamma) K$ and (\psi' \gamma)K$ decay modes using $772\times 10^{6}$ $B\bar{B}$ events collected at the \Upsilon(4S)$ resonance with Belle detector KEKB energy-asymmetric $e^+ e^-$ collider. observe $X(3872) \to J/\psi \gamma$ first evidence for $\chi_{c2} in (X_{c\bar{c}}\gamma) decays, while search \psi' no significant signal is found. measure branching fractions, $\mathcal{B}(B^{\pm} X(3872) K^{\pm}) \mathcal{B}(X(3872) J/\psi\gamma)$ $=$...
We report on a search for heavy neutrinos in B-meson decays. The results are obtained using data sample that contains 772x10^6 BB-bar pairs collected at the Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e+e- collider. No signal is observed and upper limits set mixing of left-handed Standard Model mass range 0.5 - 5.0 GeV/c^2.
We report a search for the rare decays $B\ensuremath{\rightarrow}{h}^{(*)}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, where ${h}^{(*)}$ stands ${K}^{+}$, ${K}_{S}^{0}$, ${K}^{*+}$, ${K}^{*0}$, ${\ensuremath{\pi}}^{+}$, ${\ensuremath{\pi}}^{0}$, ${\ensuremath{\rho}}^{+}$, ${\ensuremath{\rho}}^{0}$ and $\ensuremath{\phi}$. The results are obtained from $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample that contains $772\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$...
We report measurements of B→χ(c1)γK and χ(c2)γK decays using 772×10(6) BB[over ¯] events collected at the Υ(4S) resonance with Belle detector KEKB asymmetric-energy e(+)e(-) collider. Evidence a new in χ(c1)γ final state is found statistical significance 3.8σ. This has mass 3823.1±1.8(stat)±0.7(syst) MeV/c(2), value that consistent theoretical expectations for previously unseen 1(3)D(2) cc[over meson. find no other narrow set upper limits on branching fractions X(3872)→χ(c1)γ χ(c2)γ decays.
We report results of a study doubly charmed baryons and strange baryons. The analysis is performed using $980\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with the Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. search for ${\mathrm{\ensuremath{\Xi}}}_{cc}^{+(+)}$ ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}({\ensuremath{\pi}}^{+})$...
Copper-doped p-ZnO thin films (Cu:ZnO) were grown on α-Al2O3(0 0 1) and 6H:SiC(0 single crystal substrates by plasma-assisted molecular beam epitaxy. A p–n hetero-junction with p-Cu:ZnO/n-6H:SiC was successfully fabricated demonstrated as a greenish-blue light emitting diode (LED). The rectifying I–V curve along the matching photoluminescence electroluminescence emissions characterizes LED. Cu cell temperature (TCu) post-deposition annealing environment greatly influence oxidation state,...
A bstract We present measurements of absolute branching fractions hadronic and lep-tonic $ D_s^{+} decays to K − + π , {{\overline{K}}^0} ηπ μ ν τ report a search for the leptonic → e decays. The results are obtained from data sample 913 fb −1 collected at or near \varUpsilon (4 S ) (5 resonances with Belle detector KEKB asymmetric-energy collider. measured be \begin{array}{*{20}{c}} {\mathcal{B}\left( {D_s^{+}\ \to\ {K^{-}}{K^{+}}{\pi^{+}}} \right) = \left( {5.06\pm 0.15\pm 0.21}...
The cross section for e^+e^- \to \eta J/\psi between \sqrt{s}=3.8 GeV/c^2 and 5.3 is measured via initial state radiation using 980 fb^{-1} of data on around the \Upsilon(nS)(n=1,2,3,4,5) resonances collected with Belle detector at KEKB. Two resonant structures \psi(4040) \psi(4160) are observed in invariant mass distribution. Fitting spectrum coherent sum two Breit-Wigner functions, one obtains BR(\psi(4040)\to\eta J/\psi)\cdot\Gamma_{ee}^{\psi(4040)} = (4.8\pm0.9\pm1.4) eV...
We present the first measurement of angle phi_3 Unitarity Triangle using a model-independent Dalitz plot analysis B->DK, D->KsPiPi decays. The method uses an input measurements strong phase amplitude from CLEO collaboration. result is based on full data set 772x10^6 BBbar pairs collected by Belle experiment at Upsilon(4S) resonance. obtain = (77.3^{+15.1}_{-14.9} +- 4.1 4.3)^{\circ} and suppressed ratio r_B 0.145 0.030 0.010 0.011. Here error statistical, second experimental systematic...
We report the first observation of $$\Xi _{c}(2930)^0$$ charmed-strange baryon with a significance greater than 5 $$\sigma $$ . The is found in its decay to $$K^- \Lambda _{c}^+$$ $$B^{-} \rightarrow K^{-} _{c}^{+} \bar{\Lambda }_{c}^{-}$$ decays. measured mass and width are $$[2928.9 \pm 3.0(\mathrm stat.)^{+0.9}_{-12.0}(\mathrm syst.)]$$ MeV/ $$c^{2}$$ $$[19.5 8.4(\mathrm stat.) ^{+5.9}_{-7.9}(\mathrm MeV, respectively, product branching fraction $$\mathcal{B}(B^{-} \Xi _{c}(2930)^0...
We observe evidence for CP violation in the decay D+ → K(S)(0)π+ using a data sample with an integrated luminosity of 977 fb(-1) collected by Belle detector at KEKB e+ e- asymmetric-energy collider. The asymmetry is measured to be (-0.363±0.094±0.067)%, which 3.2 standard deviations away from zero, and consistent expected due neutral kaon final state.
We measure the branching fractions of ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\eta}}^{(\ensuremath{'})}$ decays with complete Belle data sample $772\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at $\ensuremath{\Upsilon}(4S)$ resonance detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. The results for are:...
We report an improved measurement of D0-D0bar mixing and a search for CP violation in D0 decays to CP-even final states K+K- pi+pi-. The is based on the Belle data sample 976/fb. results are y_CP=(1.11 +- 0.22 0.09)% A_Gamma=(-0.03 0.20 0.07)%, where first uncertainty statistical second systematic.
We report first observations of $B_s^0\to J/\psi\eta$ and J/\psi\eta'$. The results are obtained from 121.4 fb^{-1} data collected at the $\Upsilon(5S)$ resonance with Belle detector KEKB $e^+e^-$ collider. obtain branching fractions Br(B_s^0\to J/\psi\eta)= [5.10\pm 0.50(stat.)\pm 0.25(syst.)^{+1.14}_{-0.79}(N_{B_s^(*)\bar B_s^(*))] \times 10^{-4}, J/\psi\eta')=[3.71\pm 0.61(stat.)\pm 0.18(syst.)^{+0.83}_{-0.57}(N_{B_s^(*)\bar 10^{-4}. ratio two is measured to be $\frac{Br(B_s\to...
We report the measurements of branching fractions and CP violation asymmetries in $B^0 \to \phi K^{*}$ decays obtained an angular analysis using full data sample $772 \times 10^6 B\bar{B}$ pairs collected at $\Upsilon(4S)$ resonance with Belle detector KEKB asymmetric-energy $e^+ e^-$ collider. perform a partial wave to distinguish among scalar [$B^0 \phi(K\pi)^{*}_{0}$], vector K^{*}(892)^{0}$] tensor K^{*}_{2}(1430)^{0}$] components, determine corresponding be $\mathcal{B}[B^0...
We report a study of the charmless hadronic decay charged $B$ meson to three-body final state ${K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$. The results are based on data sample that contains $772\ifmmode\times\else\texttimes\fi{}1{0}^{6}\text{ }\text{ }B\overline{B}$ pairs collected at $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. measured inclusive branching fraction and direct $CP$ asymmetry...
We search for CP violation in Cabibbo-suppressed charged D meson decays by measuring the difference between CP-violating asymmetries D(±)→K(+)K(-)π(±) and Cabibbo-favored D(s)(±)→K(+)K(-)π(±) K(+)K(-) mass region of ϕ resonance. Using 955 fb(-1) data collected with Belle detector, we obtain A(CP)(D+→ϕπ+)=(+0.51±0.28±0.05)%. The measurement improves sensitivity previous searches more than a factor 5. find no evidence direct violation.
We report an observation of the |$B^{\pm } \to J/\psi \eta K^{\pm }$| and |$B^0 K^0_S$| decays using |$772\times 10^{6}B\overline {B}$| pairs collected at |$\Upsilon (4S)$| resonance with Belle detector KEKB asymmetric-energy |$e^+e^-$| collider. obtain branching fractions |${\mathcal B}(B^{\pm }\rightarrow })=(1.27\pm 0.11(\hbox {stat.})\pm {syst.}))\times 10^{-4}$| B}(B^0\to K^0_S)=(5.22 \pm 0.78 (\hbox {stat.}) 0.49 10^{-5}$|. search for a new narrow charmonium(-like) state |$X$| in...
We present a measurement of the branching fraction and time-dependent CP violation parameters in B0 --> a_1^+-(1260) pi^-+ decays. The results are obtained from final data sample containing 772x10^6 BBbar pairs collected at Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e^+e^- collider. also measure an upper limit on product for possible decay same state a_2^+-(1320) pi^-+. In to extract asymmetries, we find evidence mixing-induced decays 3.1 sigma significance rate where...
We report a study of the decay ${B}^{0}\ensuremath{\rightarrow}D{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ followed by $D\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, where $D$ indicates ${D}^{0}$ or ${\overline{D}}^{0}$. reconstruct $D{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ state in phase space corresponding to $D{K}^{*}(892{)}^{0}$. The $CP$-violating angle ${\ensuremath{\phi}}_{3}$ affects its rate via interference between $b\ensuremath{\rightarrow}u$ and...
We report a measurement of the inclusive semileptonic ${B}_{s}^{0}$ branching fraction in $121\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected near $\ensuremath{\Upsilon}(5S)$ resonance with Belle detector at KEKB asymmetric energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. Events containing ${B}_{s}^{0(*)}{\overline{B}}_{s}^{0(*)}$ pairs are selected by reconstructing tag side ${D}_{s}^{+}$ and identifying signal lepton ${\ensuremath{\ell}}^{+}$ ($\ensuremath{\ell}=e$,...
We study bottomonium production in association with an $$\eta $$ meson $$e^+e^-$$ annihilations near the $$\varUpsilon (5S)$$ , at a centre-of-mass energy of $$\sqrt{s}=10.866$$ GeV. The results are based on 121.4 fb $$^{-1}$$ data sample collected by Belle experiment asymmetric-energy KEKB collider. Only is reconstructed and missing-mass spectrum candidates investigated. observe $$e^+e^-\rightarrow \eta \varUpsilon _J(1D)$$ process find evidence for (2S)$$ process, while no significant...
We report a search for charmless hadronic decays of neutral $B$ mesons to the final state ${K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$. The results are based on $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample that contains $772\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs, and was collected at $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. find first evidence this decay...