Ki-Seok Choi
A5010588450- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Radiopharmaceutical Chemistry and Applications
- Advanced Chemical Physics Studies
- Climate Change and Environmental Impact
- Physics of Superconductivity and Magnetism
- Quantum, superfluid, helium dynamics
- Scientific Research and Discoveries
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- High-pressure geophysics and materials
- Advanced Optical Sensing Technologies
- Optical measurement and interference techniques
Soongsil University
2012-2024
Korea Aerospace University
2018-2024
Korea Advanced Institute of Science and Technology
2023
Kangwon National University
2014-2016
East Tennessee State University
2015-2016
Yonsei University
2010-2014
University of Graz
2010-2012
Pusan National University
2006-2008
We present measurements of B+→¯¯¯D*0τ+ντ and B+→¯¯¯D0τ+ντ decays in a data sample 657×106 B¯¯¯B pairs collected with the Belle detector at KEKB asymmetric-energy e+e− collider. find 446+58−56 events significance 8.1 standard deviations, 146+42−41 3.5 deviations. The latter signal provides first evidence for this decay mode. measured branching fractions are B(B+→¯¯¯D*0τ+ντ)=(2.12+0.28−0.27(stat)±0.29(syst))% B(B+→¯¯¯D0τ+ντ)=(0.77±0.22(stat)±0.12(syst))%.Received 13 May...
We present a measurement of the charmless semileptonic decay $B^0\to\pi^-\ell^+\nu$ using data sample containing 657$\times 10^6$ $B\bar{B}$ events collected with Belle detector at KEKB asymmetric-energy $e^+e^-$ collider operating near $\Upsilon(4S)$ resonance. determine total branching fraction decay, $\mathcal{B}(B^0\to\pi^-\ell^+\nu)=(1.49\pm 0.04{(\mathrm{stat})}\pm 0.07{(\mathrm{syst})})\times 10^{-4}$. also report new precise differential rate, and extract Cabibbo-Kobayashi-Maskawa...
This article describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|{V}_{cb}|$ from decay ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ using $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ Belle data collected near $\ensuremath{\Upsilon}(4S)$ resonance. We simultaneously measure product form factor normalization $\mathcal{F}(1)$ and as well three parameters ${\ensuremath{\rho}}^{2}$, ${R}_{1}(1)$...
We study the η-photoproduction focusing on new nucleon resonance which was observed at s=1675MeV with a narrow decay width (∼10MeV) in recent GRAAL experiment. Using an effective Lagrangian approach, we compute differential cross sections for η-photoproduction. In addition to N∗(1675), employ three other resonances, i.e., N∗(1535), N∗(1650) and N∗(1710), vector meson exchanges are most relevant ones this reaction process. As result, can reproduce data qualitatively well observe obvious...
We present a study of axial charges baryon ground and resonant states with relativistic constituent quark models. In particular, the octet decuplet $N$, $\Sigma$, $\Xi$, $\Delta$, $\Sigma^*$, $\Xi^*$ baryons are considered. The theoretical predictions compared to existing experimental data results from other approaches, notably lattice quantum chromodynamics chiral perturbation theory. relevance regard $\pi$-dressing spontaneous chiral-symmetry breaking is discussed.
We report the observation of two narrow structures at 10610MeV/c^2 and 10650MeV/c^2 in pi^{\pm}Upsilon(nS) (n=1,2,3) pi^{\pm}h_b(mP) (m=1,2) mass spectra that are produced association with a single charged pion Upsilon(5S) decays. The measured masses widths averaged over five final states M_1=10608.4\pm2.0MeV/c^2, Gamma_1=15.6\pm2.5MeV M_2=10653.2\pm1.5MeV/c^2, Gamma_2=14.4\pm3.2MeV. Analysis favors quantum numbers I^G(J^P)=1^+(1^+) for both states. results obtained 121.4fb^{-1} data sample...
We investigate the effects of long-range dynamic polarization on elastic cross sections for heavy-ion collisions which comprise Coulomb dipole excitation (CDE) potential and nuclear (LRN) potential. To study these effects, we perform a ${\ensuremath{\chi}}^{2}$ analysis $^{11}\mathrm{Li}\phantom{\rule{0.16em}{0ex}}+\phantom{\rule{0.16em}{0ex}}^{208}\mathrm{Pb}$ $^{6}\mathrm{He}\phantom{\rule{0.16em}{0ex}}+\phantom{\rule{0.16em}{0ex}}^{208}\mathrm{Pb}$ systems using potentials. For CDE...
We investigated the elastic scattering, inelastic breakup reactions, and total fusion reactions of $^{17}\mathrm{Ne}+^{208}\mathrm{Pb}$ system using extended optical model (OM) a coupled channel (CC) approach. The aim this study is to elucidate suppression cross section that invisible in proton-rich nuclei, such as $^{8}\mathrm{B}$ $^{17}\mathrm{F}$ projectiles, but appears neutron-rich $^{11}\mathrm{Li}$ $^{11}\mathrm{Be}$ projectiles. simultaneous ${\ensuremath{\chi}}^{2}$ analysis...
We investigate the effects of long-range dynamic polarization (LRDP) potential, which consists Coulomb dipole excitation (CDE) potential and nuclear (LRN) for $^{11}\mathrm{Be}$ projectile on $^{64}\mathrm{Zn}$. To study these effects, we perform a ${\ensuremath{\chi}}^{2}$ analysis an optical model including LRDP as well conventional short-range (SRN) potential. take into account, argue that both CDE LRN potentials are essential to explaining experimental values ${P}_{E}$, is ratio elastic...
The axial charges of the nucleon and well-established ${N}^{*}$ resonances are studied within a consistent framework. For first time produced for relativistic constituent quark model. charge is predicted close to experiment, ones ${N}^{*}(1535)$ ${N}^{*}(1650)$, only cases where such comparison possible, agree well with results from quantum chromodynamics on lattice that have recently become available. relevance magnitudes low-energy behavior discussed.
We investigate ratios of the elastic scattering cross section to Rutherford section, ${P}_{\mathrm{E}}$, and angular distributions breakup by using an optical model which exploits various long-range dynamic polarization potentials as well short-range nuclear bare for $^{11}\text{Be}$ projectile. From these simultaneous analyses, we extract a large radius halo projectile from experimental data ${P}_{\mathrm{E}}$ distribution $^{11}\text{Be}+^{64}\text{Zn}$ $^{11}\text{Be}+^{120}\text{Sn}$...
We study the reaction mechanism for photoproduction of $\ensuremath{\Lambda}(1520)$, based on an effective Lagrangian approach. investigate each contribution $s$-, $u$-, $t$-channel processes and contact term, separately. One most characteristic features this is contact-term dominance which governs from proton, when ${K}^{*}$-exchange possibly not too large. suggest several different ways polarizations arrangement beam target to understand role separately in future experiments.
We report a study of the decays $B\ensuremath{\rightarrow}{D}_{s1}(2536{)}^{+}{\overline{D}}^{(*)}$, where ${\overline{D}}^{(*)}$ is ${\overline{D}}^{0}$, ${D}^{\ensuremath{-}}$ or ${D}^{*\ensuremath{-}}$, using sample $657\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected at $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. The branching fractions...
We discuss the role of deformation target nucleus in fusion reaction $^{15}\mathrm{C}+^{232}\mathrm{Th}$ system at energies around Coulomb barrier, which $^{15}\mathrm{C}$ is a well-known one-neutron halo nucleus. To this end, we construct potential between and $^{232}\mathrm{Th}$ with double folding procedure, assuming that projectile composed core nucleus, $^{14}\mathrm{C}$, valence neutron. In addition, also take into account coupling to transfer process...
We investigate the η photoproduction using effective Lagrangian approach at tree level. include eight nucleon resonances, that is, D13(1520), S11(1535), S11(1650), D15(1675), F15(1680), D13(1700), P11(1710), P13(1720) as well possible background contributions. In addition, we introduce new resonance N*(1675) which was announced by GRAAL, CB-ELSA and Tohoku LNS-GeV-γ experiments. a role of with testing its spin parity for four different cases JP = 1/2± 3/2±. calculate various cross sections...
Using an optical model potential including inelastic scattering as well a conventional short-range nuclear potential, we investigate the ratio ${P}_{\mathrm{inel}}$ of cross section to Rutherford for $^{11}\mathrm{Be}+^{197}\mathrm{Au}$ system. As result, find that contribution first excited state $^{11}\mathrm{Be}$ projectile cannot be ignored at backward angles in unresolved elastic $+$ data and relevant depends on incident energy ${E}_{\mathrm{c}.\mathrm{m}.}$ excitation...
The roles of strange axial form factor and mass for both neutral-current charged-current reactions are investigated in the quasi-elastic neutrino-nucleus scattering within a relativistic single-particle model. calculation is performed various target nuclei like $^{12}\mathrm{C}$, $^{40}\mathrm{Ca}$, $^{56}\mathrm{Fe}$, $^{208}\mathrm{Pb}$ at incident neutrino (antineutrino) energies 1.0 2.0 GeV. Then we discuss dependence differential cross section on role with different reactions. Finally...
Existing time-resolved non-line-of-sight (NLOS) imaging methods reconstruct hidden scenes by inverting the optical paths of indirect illumination measured at visible relay surfaces. These are prone to reconstruction artifacts due inversion ambiguities and capture noise, which typically mitigated through manual selection filtering functions parameters. We introduce a fully-differentiable end-to-end NLOS inverse rendering pipeline that self-calibrates parameters during scenes, using as input...
We investigate the elastic scattering, inelastic breakup reaction, and total fusion reactions of $^{17}\mathrm{F}+^{208}\mathrm{Pb}$ system using an optical model approach by including dynamical polarization potential. In particular, we focus on reaction channels, whose effects other have been argued to be small. By exploiting two different potentials composed a surface-type Woods-Saxon potential, which were obtained fitting analysis, Love-type cross sections are explained with quasielastic...
Double folding potential is constructed using the M3Y interaction and matter densities of projectile target nuclei obtained from four microscopic energy density functional (EDF) models. The elastic scattering cross sections for 16O+208Pb system are calculated optical model with double potentials EDF We focus on correlation between behavior sections. First, charge examined by comparing results There a slight difference in internal region, but it negligible outer region. Next, we calculate...