J. H. Kang
A5107842835- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Neutrino Physics Research
- Statistical Methods and Bayesian Inference
- X-ray Spectroscopy and Fluorescence Analysis
- Evolution and Genetic Dynamics
- Evolutionary Game Theory and Cooperation
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Mathematical and Theoretical Epidemiology and Ecology Models
- Pulsars and Gravitational Waves Research
- Stochastic processes and statistical mechanics
- Astrophysics and Cosmic Phenomena
- Ion-surface interactions and analysis
- Pediatric Urology and Nephrology Studies
- Superconducting Materials and Applications
- Fusion materials and technologies
- Atomic and Molecular Physics
- Genetic and phenotypic traits in livestock
- Environmental Conservation and Management
- Black Holes and Theoretical Physics
Yonsei University
2013-2024
Massachusetts Institute of Technology
2024
Sun Yat-sen University
2021-2024
Banaras Hindu University
2003-2023
Bhabha Atomic Research Centre
2018-2023
Charles University
2018-2023
Augustana University
2014-2023
PHENIX laboratory
2003-2022
A. Alikhanyan National Laboratory
2014-2020
Abilene Christian University
2003-2018
We present an improved measurement of the branching fraction for electroweak penguin process $B\ensuremath{\rightarrow}{X}_{s}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$, where $\ensuremath{\ell}$ is electron or a muon and ${X}_{s}$ hadronic system containing $s$-quark. The based on sample $152\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ events collected with Belle detector at KEKB energy asymmetric...
Semi-inclusive proton and pion distributions from central Au+Au reactions at 11.6A GeV/c have been measured. The rapidity distribution shows significantly increased stopping compared to lighter systems, providing strong evidence for the formation of a state matter with baryon density substantially greater than normal nuclear matter. Unlike this energy induced by heavy ions, low mt−m0 invariant spectra deviate single exponential shape become flatter, while π− are found rise faster π+...
We present the first model-independent measurement of absolute branching fraction Λ(c)(+) → pK(-)π(+) decay using a data sample 978 fb(-1) collected with Belle detector at KEKB asymmetric-energy e(+)e(-) collider. The number baryons is determined by reconstructing recoiling D((*)-) pπ(+) system in events type pπ(+)Λ(c)(+). measured to be B(Λ(c)(+) pK(-)π(+)) = (6.84 ± 0.24(-0.27)(+0.21))%, where and second uncertainties are statistical systematic, respectively.
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 ${\mathrm{\ensuremath{\Xi}}}_{cc}^{+(+)}$ ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}({\ensuremath{\pi}}^{+})$...
Proton and deuteron distributions from $11.6A \mathrm{GeV}/c$ Au + collisions measured by the E802 Collaboration in experiment E-866 are presented. The invariant yield of protons deuterons is studied as a function transverse mass for different cuts rapidity centrality. At low ${m}_{t}\ensuremath{-}{m}_{0}$ proton spectra deviate single exponential shape. average ${m}_{t}$ centrality used to explore effect collective flow reaction. ratio squared momentum, rapidity, probe coalescence model...
An excitation function of proton rapidity distributions for different centralities is reported from AGS Experiment E917 $\mathrm{Au}+\mathrm{Au}$ collisions at 6, 8, and 10.8 GeV/nucleon. The peripheral have a valley midrapidity which smoothly change to that display broad peak central collisions. mean loss increases with increasing beam energy, whereas the fraction protons consistent isotropic emission stationary source decreases energy. data suggest stopping substantially less than complete...
Particle production in proton-induced reactions at 14.6 GeV/c on Be, Al, Cu, and Au targets has been systematically studied using the E-802 spectrometer BNL-Alternating Gradient Synchrotron. Particles are measured angular range from 5\ifmmode^\circ\else\textdegree\fi{} to 58\ifmmode^\circ\else\textdegree\fi{} identified up momenta of 5, 3.5, 8 for pions, kaons, protons, respectively. Mechanisms particle discussed comparison with heavy-ion-induced same incident energy per nucleon.
We report the first observation of charmless vector-vector decay process B∓→ρ∓ρ0. The measurement uses a 78 fb−1 data sample collected with Belle detector at KEKB asymmetric e+e− collider operating Υ(4S) resonance. obtain branching fraction B(B∓→ρ∓ρ0)=[31.7±7.1(stat)−6.7+3.8(syst)]×10−6. An analysis ρ helicity-angle distributions gives longitudinal polarization ΓL/Γ=0.95±0.11(stat)±0.02(syst). also measure direct-CP-violating asymmetry ACP(B∓→ρ∓ρ0)=0.00±0.22(stat)±0.03(syst).Received 3 June...
A systematic study of the spectra and yields ${K}^{+}$ ${K}^{\ensuremath{-}}$ is reported by experiment E866 as a function centrality in Au+Au collisions at $11.6A \mathrm{GeV}/c.$ The invariant transverse for both kaon species are well described exponentials ${m}_{t},$ with inverse slope parameters that largest midrapidity which increase centrality. slopes slightly larger than spectra. rapidity density peaks distribution wider ${K}^{\ensuremath{-}}.$ integrated total nonlinearly steadily...
Charged kaon production has been measured in Si+Al and Si+Au collisions at 14.6 A GeV/c, Au+Au 11.1 GeV/c by Experiments 859 866 (the E--802 Collaboration) the BNL AGS. Invariant transverse mass spectra rapidity distributions for both K+ K- are presented. The centrality dependence of rapidity-integrated yields is studied. Strangeness enhancement observed as an increase slope yield with total number participants well per participant. starts peripheral (relative to N+N) appears saturate a...
The AGS spectrometer experiment E-802 has measured transverse mass spectra for charged hadrons over a wide rapidity interval in Si+Au, Si+Cu, and Si+Al reactions at 14.6A Gev/c. These results are compared two different trigger conditions: central collisions corresponding to 7% of the inelastic cross section selected on multiplicity particles peripheral roughly 50% high kinetic energy zero degrees. invariant well described by exponentials allowing extraction distributions inverse slope...
We report the observation of flavor-changing neutral current decay B-->K(*)l(+)l(-) and an im-proved measurement B-->Kl(+)l(-), where l represents electron or a muon, with data sample 140 fb(-1) accumulated at Upsilon(4S) resonance Belle detector KEKB. The results for branching fractions are B(B-->K(*)l(+)l(-))=(11.5(+2.6)(-2.4)+/-0.8+/-0.2)x10(-7) B(B-->Kl(+)l(-))=(4.8(+1.0)(-0.9)+/-0.3+/-0.1)x10(-7), first error is statistical, second systematic third from model dependence.
The production of ${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$,${\mathit{K}}^{\ifmmode\pm\else\textpm\fi{}}$,p has been measured in p+Be and p+Au collisions for comparison with central Si+Au collisions. inverse slope parameters ${\mathit{T}}_{0}$ obtained by an exponential fit to the invariant cross sections transverse mass are found be, ${\mathit{T}}_{0}^{\mathit{p},}$${\mathit{K}}^{+}$,${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{\pi}}}$\ensuremath{\sim}140--160 MeV...
We report on a measurement of ϕ-meson production in Au+Au collisions at beam momentum 11.7AGeV∕c by experiment 917 the alternating gradient synchroton. The covers midrapidity region 1.2<y<1.6. Transverse-mass spectra and rapidity distributions are presented as functions centrality characterized number participant projectile nucleons. yield ϕ’s per nucleon increases strongly central manner similar to that observed for kaons.7 MoreReceived 21 April...
We present measurements of the masses and decay widths baryonic states ${\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{0/++}$ ${\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{0/++}$ using a data sample corresponding to an integrated luminosity $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with Belle detector at KEKB ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy collider operating $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance. report mass differences respect...
We report measurements for two-body charmless B decays with an eta' meson in the final state. Using 11.1X10^6 BBbar pairs collected Belle detector, we find BF(B^+ ->eta'K^+)=(79^+12_-11 +-9)x10^-6 and BF(B^0 -> eta'K^0)=(55^+19_-16 +-8)x10^-6, where first second errors are statistical systematic, respectively. No signal is observed mode B^+ pi^+, set a 90% confidence level upper limit of BF(B^+-> eta'pi^+) < 7x10^-6. The CP asymmetry B^+- eta'K^+- investigated at -0.20<Acp<0.32 obtained.
In this paper Au+Au collisions at 11.6A GeV/c are characterized by two global observables: the energy measured near zero degrees (EZCAL) and total event multiplicity. Particle spectra for different classes that defined in a two-dimensional grid of both observables. For moderately central events (σ/σint<12%) proton dN/dy distributions do not depend on EZCAL but only contrast shape transverse shows little dependence The change suggests conditions formed collision classes. These studied signals...
An analysis of inclusive pion production in proton-beryllium collisions at 6.4, 12.3, and 17.5 GeV/$c$ proton beam momentum has been performed. The data were taken by Experiment 910 the Alternating Gradient Synchrotron Brookhaven National Laboratory. differential ${\ensuremath{\pi}}^{+}$ ${\ensuremath{\pi}}^{\ensuremath{-}}$ cross sections (${d}^{2}\ensuremath{\sigma}/\mathit{dpd}\ensuremath{\Omega}$) measured up to 400 mrad ${\ensuremath{\theta}}_{\ensuremath{\pi}}$ 6...
Explaining biodiversity is a fundamental issue in ecology. A long-standing puzzle lies the paradox of plankton: many species plankton feeding on limited variety resources coexist, apparently flouting competitive exclusion principle (CEP), which holds that number predator (consumer) cannot exceed at steady state. Here, we present mechanistic model and demonstrate intraspecific interference among consumers enables plethora consumer to coexist constant population densities with only one or...
We present results for antilambda and antiproton production in Au+Au collisions at 11.7 A GeV/c including spectra extracted invariant yields both species central peripheral the rapidity range 1.0<y<1.4. The yield increases from dN(Lambda;)/dy = 1.2(+0.7+0.2)(-0.6-0.2)x10(-3) to 19(+4+3)(-5-2)x10(-3) collisions. direct is deduced measured total extract ratio of antilambda-to-direct-antiproton production. Lambda/p near midrapidity 0.26(+0.19+0.5)(-0.15-0.4) 3.6(+4.7+2.7)(-1.8-1.1) collisions,...
We report the measurement of charmed baryonic decay ¯¯¯B0→Λ+c¯p with a branching fraction (2.19+0.56−0.49±0.32±0.57)×10−5 and statistical significance 5.8 σ. The errors are statistical, systematic, error Λ+c→pK−π+ fraction. This is first observation two-body B decay. analysis based on 78.2 fb−1 data accumulated at Υ(4S) resonance Belle detector KEKB asymmetric e+e− collider.Received 20 December 2002DOI:https://doi.org/10.1103/PhysRevLett.90.121802©2003 American Physical Society
Antiproton production in $11.7A\mathrm{GeV}/c$ $\mathrm{Au}+\mathrm{Au}$ collisions over a wide transverse-mass coverage was studied using the AGS-E866 experimental apparatus. The mean transverse kinetic energy increases as function of centrality and is similar to that protons. antiproton yields $\mathrm{Si}+\mathrm{Al}$, $\mathrm{Si}+\mathrm{Au}$, are consistent with scaling 0.7 power number participant nucleons.