A5069009197- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Distributed and Parallel Computing Systems
- Superconducting and THz Device Technology
- Gamma-ray bursts and supernovae
- Radiopharmaceutical Chemistry and Applications
- Advanced NMR Techniques and Applications
- Physics of Superconductivity and Magnetism
- Chemical Reactions and Isotopes
Shimadzu (Japan)
2024
Hanyang University
2014-2023
Institute of Natural Science
2019-2022
University of the Basque Country
2013-2022
Duke University
2022
Campbell Collaboration
2022
Chonnam National University
2007-2022
University of Bonn
2022
High Energy Accelerator Research Organization
2006-2019
Korea University
2019
Using 605 fb−1 of data collected at the Υ(4S) resonance we present a measurement inclusive radiative B-meson decay channel, B→Xsγ. For lower photon energy thresholds 1.7, 1.8, 1.9, and 2.0 GeV, as defined in rest frame B meson, measure partial branching fraction mean variance spectrum. At 1.7 GeV threshold obtain BF(B→Xsγ)=(3.45±0.15±0.40)×10−4, where errors are statistical systematic.Received 8 July 2009DOI:https://doi.org/10.1103/PhysRevLett.103.241801©2009 American Physical Society
The interference fragmentation function translates the of a quark with transverse projection spin into an azimuthal asymmetry two final-state hadrons. In e+e- annihilation product functions is measured. We report nonzero asymmetries for pairs charge-ordered pi+pi- pairs, which indicate significant in this channel. results are obtained from 672 fb-1 data sample that contains 711 \times 106 and was collected at near ?(4S) resonance, Belle detector KEKB asymmetric-energy collider.
We report measurements of the branching fractions and direct CP asymmetries (A_{CP}) for B->K pi, pi KK decays (but not pi^0 pi^0) based on final data sample 772x10^6 B B-bar pairs collected at Upsilon(4S) resonance with Belle detector KEKB asymmetric-energy e^+ e^- collider. set a 90% confidence-level upper limit K^+- K^-+ 2.0x10^{-7}; all other are observed ranging from 10^{-6} to 10^{-5}. In $B^0/B^0-bar -> K^+-\pi^-+ mode, we confirm Belle's previously reported large A_{CP} value -0.069...
We present an analysis of the decay J/ψ→γ4π in final states γπ+π−π+π− and γπ+π0π−π0. The branching fractions obtained are B(J/ψ→γπ+π−π+π−)= (3.05±0.08±0.45)×10−3 B(J/ψ→γπ+π0π−πo)=( 8.3±0.2±3.1)×10−3 for m4π less than 2 GeV/c2. 4π invariant-mass distributions extend from 1.0 to 3.0 GeV/c2, showing peaks at approximately 1.55 1.8 In state we find that ≊50% events below GeV/c2 pseudoscalar ρρ, product fraction which is determined be &→ρρ)= (4.7±0.3±0.9)×10−3. No other significant ρρ component...
The differential cross sections for the process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ have been measured in kinematic range $0.6\text{ }\text{ }\mathrm{GeV}<W<4.1\text{ }\mathrm{GeV}$, $|\mathrm{cos}{\ensuremath{\theta}}^{*}|<0.8$ energy and pion scattering angle, respectively, $\ensuremath{\gamma}\ensuremath{\gamma}$ center-of-mass system. results are based on a $223\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data...
We present evidence for the radiative decay J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\omega}\ensuremath{\omega} with a branching fraction of (1.76\ifmmode\pm\else\textpm\fi{}0.09\ifmmode\pm\else\textpm\fi{}0.45)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$. The \ensuremath{\omega}\ensuremath{\omega} invariant-mass distribution peaks at 1.8 GeV/${c}^{2}$, just above threshold. Analysis angular correlations indicates that system below 2...
We search for dimuon decays of a low mass particle in the ${B}^{0}\ensuremath{\rightarrow}{K}^{*0}X$ and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}X$ using data sample $657\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ events collected with Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. find no evidence such range from $212\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ to $300\text{ lifetimes below ${10}^{\ensuremath{-}12}\text{ }\mathrm{s}$,...
We report results on time-dependent $CP$ asymmetries in $B\ensuremath{\rightarrow}{D}^{*\ensuremath{\mp}}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ decays based a data sample containing $657\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected with the Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider $\ensuremath{\Upsilon}(4S)$ resonance. use partial reconstruction technique, wherein signal events are identified using information...
The invariant mass spectrum of the ${\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ final state produced in two-photon collisions is obtained using a $673\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected vicinity $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector at KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We observe clear signal ${\ensuremath{\eta}}_{c}(1S)$ and measure its width to be...
The electromagnetic calorimeter of the BELLE II detector for experiments at Super B-factory SuperKEKB is briefly described. project upgrade to meet severe background conditions expected upgraded KEK B factory presented.
We study charmless B+ meson decays to the pΛ¯π+π− final state using a 605 fb−1 data sample collected at Υ(4S) resonance with Belle detector KEKB asymmetric-energy e+e− collider. There are significant signals found pΛ¯ mass peaking near threshold. The observed branching fraction for nonresonant B+→pΛ¯π+π− is (5.92−0.84+0.88(stat)±0.69(syst))×10−6 significance of 9.1 standard deviations. also observe intermediate three-body decay B+→pΛ¯ρ0 (4.78−0.64+0.67(stat)±0.60(syst))×10−6 and 9.5...
The Belle II experiment at the SuperKEKB collider in Japan has been under construction toward a physics run 2018 with an ultimate target of 40 times higher instantaneous luminosity than KEKB collider. main motivation is to search for New Physics from heavy quark/lepton flavor decays. In order select event interest efficiently much and beam background environment KEKB, we have upgraded Electromagnetic Calorimeter (ECL) hardware trigger system. It would be realized by improvement ECL logic...
The cross sections for the reactions $e^+e^- \to \phi\eta, \quad \phi\eta', \rho\eta, \rho\eta'$ have been measured using a data sample of 516 fb$^{-1}$ collected with Belle detector at KEKB asymmetric-energy $e^+e^-$ collider. corresponding values are: $1.4 \pm 0.4 0.1$ fb $(\phi\eta)$, $5.3 1.1 0.4$ $(\phi\eta')$, $3.1 0.5 $(\rho\eta)$ and $3.3 0.6 0.2$ $(\rho\eta')$. energy dependence is presented measurements together those CLEO BaBar.
We report a search for the rare charmless decay ${B}^{+}\ensuremath{\rightarrow}{\overline{K}}^{*0}{K}^{*+}$ using data sample of $772\ifmmode\times\else\texttimes\fi{}1{0}^{6}$ $B\overline{B}$ pairs collected at $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. No statistically significant signal is found and 90% confidence-level upper limit set on branching fraction...
In this article, we will explain the classification of detection methods using tracer gas, typical leak testing methods, and introduce latest trends in detector.
The Belle II experiment at KEK in Japan has started real data taking from April 2018 to probe a New Physics beyond the Standard Model by measuring CP violation precisely and rare weak decays of heavy quark lepton. is performed high luminosity SuperKEKB e^+ e^- collider with 80 x 10^34 cm^-2 s^-1 as an ultimate instantaneous luminosity. In order develop test appropriate trigger algorithm under much higher beam background environment than previous KEKB collider, detail simulation study...