A5106406137- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- VLSI and Analog Circuit Testing
- Astrophysics and Cosmic Phenomena
- Cloud Computing and Resource Management
- IoT and Edge/Fog Computing
- Medical Imaging Techniques and Applications
- Advanced Data Storage Technologies
- Radiation Effects in Electronics
- Low-power high-performance VLSI design
Sungkyunkwan University
2007-2024
Ewha Womans University
2013
Korea Institute of Science & Technology Information
2013
Kyungpook National University
2013
Jeonbuk National University
2013
Chonnam National University
2013
Seoul National University
2008-2013
Nagoya University
2008
A distinct peak is observed in the ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\psi}}^{\ensuremath{'}}$ invariant mass distribution near 4.43 GeV $B\ensuremath{\rightarrow}K{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\psi}}^{\ensuremath{'}}$ decays. fit using a Breit-Wigner resonance shape yields and width of $M=4433\ifmmode\pm\else\textpm\fi{}4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}2(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}$...
We report a measurement of the exclusive e+ e- -->Lambda+_(c)Lambda-_(c) cross section as function center-of-mass energy near Lambda+_(c)Lambda-_(c) threshold. A clear peak with significance 8.2sigma is observed in invariant mass distribution just above With an assumption resonance origin for peak, and width M=[4634 (+8)_(-7)(stat)(+5)_(-8)(syst)] MeV/c(2) Gamma_(tot)=[92 (+40)_(-24)(stat)(+10)_(-21)(syst)] MeV are determined. The analysis based on study events initial-state-radiation...
We report the first observation of two resonance-like structures in pi+ chi_c1 invariant mass distribution near 4.1 GeV/c^2 exclusive B0-bar --> K- decays. From a Dalitz plot analysis which are represented by Breit-Wigner resonance amplitudes, we determine masses and widths of: M_1 = (4051 +-14 +20-41) MeV/c^2, Gamma_1 (82 +21-17 +47-22) MeV, M_2 (4248 +44-29 +180-35}) Gamma_2 =(177 +54-39 +316-61) MeV; product branching fractions BF(B0-bar Z+_1,2) x BF(Z+_1,2 chi_c1) (3.0 +1.5-0.8 +3.7-1.6)...
The Collins effect connects transverse quark spin with a measurable azimuthal asymmetry in the yield of hadronic fragments around quark's momentum vector. Using two different reconstruction methods we measure statistically significant asymmetries for charged pion pairs ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at center-of-mass energies 10.52 GeV and 10.58 GeV, which can be attributed to fragmentation primordial quarks components. measurement was performed using data set $547\text{ }\text{...
We report an observation of the decay $B^0\to D^{*-} \tau^+ \nu_{\tau}$ in a data sample containing $535\times10^6$ $B\bar{B}$ pairs collected with Belle detector at KEKB asymmetric-energy $e^+e^-$ collider. find signal significance 5.2 standard deviations and measure branching fraction $\mathcal{B}(B^0\to \tau ^+ \nu_{\tau})=(2.02 ^{+0.40}_{-0.37} (stat) \pm 0.37 (syst)) % $. This is first exclusive $B$ $b \to c transition.
We report measurements of the exclusive cross section for e+e−→D¯¯¯D, where D=D0 or D+, in center-of-mass energy range from D¯¯¯D threshold to 5 GeV with initial-state radiation. The analysis is based on a data sample collected Belle detector an integrated luminosity 673 fb−1.Received 18 October 2007DOI:https://doi.org/10.1103/PhysRevD.77.011103©2008 American Physical Society
We report a measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays using time-dependent Dalitz plot analysis. first assume CP conservation and subsequently allow for violation. The results are based on 540 fb$^{-1}$ data accumulated with the Belle detector at KEKB $e^+e^-$ collider. Assuming negligible violation, we measure parameters $x=(0.80\pm0.29^{+0.09 +0.10}_{-0.07 -0.14})%$ $y=(0.33\pm0.24^{+0.08 +0.06}_{-0.12 -0.08})%$, where errors statistical, experimental systematic, systematic...
We present a high-statistics measurement of differential cross sections and the total section for process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ in kinematic range $0.6\text{ }\text{ }\mathrm{GeV}\ensuremath{\le}W\ensuremath{\le}4.0\text{ }\mathrm{GeV}$ $|\mathrm{cos}{\ensuremath{\theta}}^{*}|\ensuremath{\le}0.8$, where $W$ ${\ensuremath{\theta}}^{*}$ are energy pion scattering angle, respectively,...
We present a search for the rare decays B→h(*)ν¯ν, where h(*) stands light meson. A data sample of 535×106 B¯¯¯B pairs collected with Belle detector at KEKB e+e− collider is used. Signal candidates are required to have an accompanying B meson fully reconstructed in hadronic mode and signal side particles consistent single No significant observed we set upper limits on branching fractions 90% confidence level. The B0→K*0ν¯ν B+→K+ν¯ν more stringent than previous constraints, while first...
We have studied B_(s);(0)-->D_(s);(-)pi;(+) and B_(s);(0)-->D_(s);(-/+)K;(+/-) decays using 23.6 fb;(-1) of data collected at the Upsilon(5S) resonance with Belle detector KEKB e;(+)e;(-) collider. This highly pure sample is used to measure branching fraction, B(B_(s);(0)-->D_(s);(-)pi;(+))=[3.67_(-0.33);(+0.35)(stat)-0.42+0.43(syst)+/-0.49(f_(s))]x10;(-3) (f_(s)=N_(B_(s);((*))B[over ]_(s);((*)))/N_(bb[over ])) fractions B_(s);(0) event types energy, in particular N_(B_(s);(*)B[over...
We present a time-dependent Dalitz plot measurement of CP violation parameters in B0 --> Ks Pi+ Pi- decays. These results are obtained from large data sample that contains 657 million BBbar pairs collected at the Y(4S) resonance with Belle detector KEKB asymmetric-energy e+e- collider. For parameters, we obtain two consistent solutions describe well. The first these may be preferred by external information other measurements. There is no evidence for direct rho0(770) Ks, f0(980) and K*+(892)...
We report a study of semileptonic $B$ decays to $P$-wave ${D}^{**}$ mesons. Semileptonic decay ${D}_{2}^{*}$ meson is observed for the first time and its product branching ratio measured be...
We study the following charmless baryonic three-body decays of $B$ mesons: ${B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}\ensuremath{\gamma}$, ${B}^{+}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{0}$, and ${B}^{0}\ensuremath{\rightarrow}p\overline{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{\ensuremath{-}}$. The partial branching fractions as a function baryon-antibaryon mass polar angle distributions proton in system are presented. This includes...
We present a measurement of the CP-violating asymmetry in rho+rho- decays using 535 million BBbar pairs collected with Belle detector at KEKB e+e- collider. measure coefficients A = 0.16 +- 0.21(stat) 0.07 (syst) and S 0.19 0.30(stat) (syst}. These values are used to determine unitarity triangle angle phi_2 an isospin analysis; solution consistent Standard Model lies range 53 < 114 deg. 90 C.L.
We study the charmless decays B→ΛΛ¯h, where h stands for π+, K+, K0,K*+, or K*0, using a 605 fb−1 data sample collected at Υ(4S) resonance with Belle detector KEKB asymmetric energy e+e− collider. observe B0→ΛΛ¯K0 and B0→ΛΛ¯K*0 branching fractions of (4.76−0.68+0.84(stat)±0.61(syst))×10−6 (2.46−0.72+0.87±0.34)×10−6, respectively. The significances these signals in threshold-mass enhanced mass region, MΛΛ¯<2.85 GeV/c2, are 12.4σ 9.3σ, also update fraction...
We present a search for the decays B+→π+ℓ+ℓ− and B0→π0ℓ+ℓ−, where ℓ+ℓ− is either μ+μ− or e+e− pair, with data sample of 657×106 B¯¯¯B pairs collected Belle detector at KEKB collider. Signal events are reconstructed from charged neutral pion candidate pair oppositely electrons muons. No significant signal observed we set an upper limit on isospin-averaged branching fraction B(B→πℓ+ℓ−)<6.2×10−8 90% confidence level.Received 26 April 2008DOI:https://doi.org/10.1103/PhysRevD.78.011101©2008...
We report new measurements of the decays B+-->rho+gamma, B0-->rho0gamma, and B0-->omegagamma using a data sample 657x10(6) B meson pairs accumulated with Belle detector at KEKB e+e- collider. measure branching fractions B(B+-->rho+gamma)=(8.7_-2.7-1.1;+2.9+0.9)x10(-7), B(B0-->rho0gamma)=(7.8_-1.6-1.0;+1.7+0.9)x10(-7), B(B0-->omegagamma)=(4.0_-1.7;+1.9+/-1.3)x10(-7). also isospin asymmetry Delta(rhogamma)=-0.48_-0.19-0.09;+0.21+0.08 first measurement direct CP-violating...
We report improved measurements of time-dependent $CP$ violation parameters for ${B}^{0}({\overline{B}}^{0})\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{0}$ decay. This analysis is based on $535\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs accumulated at the $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. From distribution proper time intervals between two $B$ decays, we obtain...