A5078328945- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- GaN-based semiconductor devices and materials
- Semiconductor Quantum Structures and Devices
- Neutrino Physics Research
- Particle Detector Development and Performance
- Photonic and Optical Devices
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Quantum optics and atomic interactions
- Particle Accelerators and Free-Electron Lasers
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Nanowire Synthesis and Applications
- Nuclear physics research studies
- Superconducting Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Plasmonic and Surface Plasmon Research
- Semiconductor materials and devices
- ZnO doping and properties
- Computational Physics and Python Applications
- Optical Coatings and Gratings
- Medical Imaging Techniques and Applications
- Quantum, superfluid, helium dynamics
University of Michigan–Ann Arbor
2016-2025
National Central University
2014-2024
Michigan United
2014-2024
Universität Hamburg
2024
Washington University in St. Louis
2021
Rutgers, The State University of New Jersey
2006-2020
Thomas Jefferson National Accelerator Facility
2002-2017
Argonne National Laboratory
2002-2017
Temple University
2017
University of California, Davis
2017
We report the observation of a narrow charmoniumlike state produced in exclusive decay process B+/--->K+/-pi(+)pi(-)J/psi. This state, which decays into pi(+)pi(-)J/psi, has mass 3872.0+/-0.6(stat)+/-0.5(syst) MeV, value that is very near M(D0)+M(D(*0)) threshold. The results are based on an analysis 152M B-Bmacr; events collected at Upsilon(4S) resonance Belle detector KEKB collider. signal statistical significance excess 10sigma.
We present a measurement of the standard model $\mathrm{CP}$ violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ based on $29.1{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral $B$ meson is fully reconstructed as $J/\ensuremath{\psi}{K}_{S}$, $\ensuremath{\psi}(2S){K}_{S}$, ${\ensuremath{\chi}}_{c1}{K}_{S}$, ${\ensuremath{\eta}}_{c}{K}_{S}$,...
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 $M=4433\ifmmode\pm\else\textpm\fi{}4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}2(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}$...
This paper presents an analysis of optical buffers based on slow-light delay lines. The focus this is lines in which the group velocity reduced using linear processes, including electromagnetically induced transparency (EIT), population oscillations (POs), and microresonator-based photonic-crystal (PC) filters. We also consider by adiabatic process bandwidth compression. A framework developed for comparing these techniques identifying fundamental physical limitations technologies. It shown...
The cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\psi}(2S)$ between threshold and $\sqrt{s}=5.5\text{ }\text{ }\mathrm{GeV}$ is measured using $673\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data on off the $\ensuremath{\Upsilon}(4S)$ resonance collected with Belle detector at KEKB. Two resonant structures are observed in...
The cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ between 3.8 and $5.5\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ is measured using a $548\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected on or near the $\ensuremath{\Upsilon}(4S)$ resonance with Belle detector at KEKB. A peak $4.25\text{ }\mathrm{GeV}/{c}^{2}$, corresponding to so called $Y(4260)$, observed. In addition, there another...
We report the observation of a near-threshold enhancement in omegaJ/psi invariant mass distribution for exclusive B-->KomegaJ/psi decays. The results are obtained from 253 fb(-1) data sample that contains 275 x 10(6) BB pairs were collected near Upsilon(4S) resonance with Belle detector at KEKB asymmetric energy e(+)e(-) collider. statistical significance is estimated to be greater than 8sigma.
A compact variable all-optical buffer using semiconductor quantum dot (QD) structures is proposed and analyzed. The buffering effect achieved by slowing down the optical signal an external control light source to vary dispersion characteristic of medium via electromagnetically induced transparency effect. We present a theoretical investigation criteria for achieving slow in QDs. QD structure presence strain analyzed with inclusion polarization-dependent intersubband dipole selection rules....
We demonstrate slow light via population oscillation in semiconductor quantum-well structures for the first time. A group velocity as low 9600 m/s is inferred from experimentally measured dispersive characteristics. The transparency window exhibits a bandwidth large 2 GHz.
We report the observation of prompt J/psi via double cc; production from e+e- continuum. In this process one pair fragments into a meson while remaining either produces charmonium state or open charm. Both cases have been experimentally observed. find cross sections sigma[e+e- -->J/psieta(c)(gamma)]xB(eta(c)-->>or=4 charged)=(0.033(+0.007)(-0.006)+/-0.009) pb and sigma(e+e- -->J/psiD(*+)X)=(0.53(+0.19)(-0.15)+/-0.14) infer -->J/psicc;)/sigma(e+e- -->J/psiX)=0.59(+0.15)(-0.13)+/-0.12. These...
We report the results of a study charged B decays to D+- pi-+ and D*+- final states using complete D(*) reconstruction. The contributions two-body => D** pi with narrow (j=3/2) broad (j=1/2) have been determined masses widths four measured. This is first observation D*0_0 D'0_1 mesons. analysis based on data sample 65 million barB pairs collected in Belle experiment.
We report the first observation of a charmoniumlike state recoiling from J/psi in inclusive process e+e- -->J/psi+anything at mass (3.943+/-0.006+/-0.006) GeV/c{2}. also observe decay this into D*D[over ] and determine its intrinsic width to be less than 52 MeV/c{2} 90% C.L. These results are obtained 357 fb{-1} data sample collected with Belle detector near Upsilon(4S) resonance, KEKB asymmetric-energy collider.
We report the first observation of two charmed strange baryons that decay into Lambda(c)(+)Kappa(-)pi(+). The broader states is measured to have a mass 2978.5+/-2.1+/-2.0 MeV/c2 and width 43.5+/-7.5+/-7.0 MeV/c2. narrow state are be 3076.7+/-0.9+/-0.5 MeV/c;{2} 6.2+/-1.2+/-0.8 MeV/c2, respectively. also perform search for isospin partner Lambda(c)(+)Kappa(0)/(s)pi(-) observe significant signal at 3082.8+/-1.8+/-1.5 data used this analysis were accumulated or near Upsilon(4S) resonance, using...
We report on a search for new resonant states in the process γγ→D¯¯¯D. A candidate C-even charmonium state is observed vicinity of 3.93 GeV/c2. The production rate and angular distribution γγ center-of-mass frame suggest that this previously unobserved χ′c2, 23P2 state.Received 15 December 2005DOI:https://doi.org/10.1103/PhysRevLett.96.082003©2006 American Physical Society
We present the first evidence of decay B -→ τ -ντ , using 414 fb -1 data collected at Υ(4S) resonance with Belle detector KEKB asymmetric-energy e + -collider.Events are tagged by fully reconstructing one mesons in hadronic modes.We detect signal a significance 3.5 standard deviations including systematics, and measure branching fraction to be B(B ) = (1.79+0.56 -0.49(stat) +0.46 -0.51 (syst)) × 10 -4 .This implies that fB 0.229 +0.036 -0.031 (stat) +0.034 -0.037 (syst) GeV is direct...
The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around quark's momentum vector. Using two different reconstruction methods, we find evidence statistically significant asymmetries for charged pion pairs e(+)e(-) annihilation at center-of-mass energy 10.52 GeV, which can be attributed to polarization primordial quarks. measurement was performed using sample 79 x 10(6) events collected Belle detector.
We observe evidence for D0−¯¯¯D0 mixing by measuring the difference in apparent lifetime when a D0 meson decays to CP eigenstates K+K− and π+π− it final state K−π+. find relative of lifetimes yCP be [1.31±0.32(stat)±0.25(syst)]%, 3.2 standard deviations from zero. also search asymmetry between ¯¯¯D0 decays; no violation is found. These results are based on 540 fb−1 data recorded Belle detector at KEKB e+e− collider.Received 31 March 2007DOI:https://doi.org/10.1103/PhysRevLett.98.211803©2007...
We report new measurements of the parity-violating asymmetry ${A}_{\mathrm{PV}}$ in elastic scattering 3 GeV electrons off hydrogen and $^{4}\mathrm{He}$ targets with $⟨{\ensuremath{\theta}}_{\mathrm{lab}}⟩\ensuremath{\approx}6.0\ifmmode^\circ\else\textdegree\fi{}$. The result is ${A}_{\mathrm{PV}}=\mathbf{(}+6.40\ifmmode\pm\else\textpm\fi{}0.23(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.12(\mathrm{syst})\mathbf{)}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$....
We have measured the parity-violating electroweak asymmetry in elastic scattering of polarized electrons from protons. Significant contributions to this could arise strange form factors nucleon. The is $A=\ensuremath{-}15.05\ifmmode\pm\else\textpm\fi{}0.98(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.56(\mathrm{syst})\phantom{\rule{0.3em}{0ex}}\mathrm{ppm}$ at kinematic point $⟨{\ensuremath{\theta}}_{\mathrm{lab}}⟩=12.3\ifmmode^\circ\else\textdegree\fi{}$ and...
We report the first observation of e+e−→Υ(1S)π+π−, Υ(2S)π+π−, and evidence for e+e−→Υ(3S)π+π−, Υ(1S)K+K−, near peak Υ(5S) resonance at s∼10.87 GeV. The results are based on a data sample 21.7 fb−1 collected with Belle detector KEKB e+e− collider. Attributing signals to resonance, partial widths Γ(Υ(5S)→Υ(1S)π+π−)=0.59±0.04(stat)±0.09(syst) MeV Γ(Υ(5S)→Υ(2S)π+π−)=0.85±0.07(stat)±0.16(syst) obtained from observed cross sections. These values exceed by more than 2 orders magnitude previously...