W. L. Chang
A5051006602- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Energy Harvesting in Wireless Networks
- Advanced NMR Techniques and Applications
- Innovative Energy Harvesting Technologies
- Atomic and Subatomic Physics Research
- Wireless Power Transfer Systems
- Nuclear physics research studies
- Computational Physics and Python Applications
University of Chinese Academy of Sciences
2020-2024
Institute of High Energy Physics
2020-2024
From 1310.6×10^{6} J/ψ and 448.1×10^{6} ψ(3686) events collected with the BESIII experiment, we report first observation of Σ^{+} Σ[over ¯]^{-} spin polarization in e^{+}e^{-}→J/ψ[ψ(3686)]→Σ^{+}Σ[over decays. The relative phases form factors ΔΦ have been measured to be (-15.5±0.7±0.5)° (21.7±4.0±0.8)° data, respectively. nonzero value allows for a direct simultaneous measurement decay asymmetry parameters Σ^{+}→pπ^{0}(α_{0}=-0.998±0.037±0.009) ¯]^{-}→p[over ¯]π^{0}(α[over...
Using initial-state radiation events from a total integrated luminosity of $11.957\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$ collision data collected at center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector BEPCII, cross section for process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\overline{\mathrm{\ensuremath{\Lambda}}}$ is measured in 16...
Using $e^{+}e^{-}$ collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at BEPCII collider, and a total integrated luminosity of 300 pb^{-1}, partial-wave analysis is performed for process $e^{+}e^{-} \to K^{+}K^{-}\pi^{0}\pi^{0}$. The Born cross sections K^{+}K^{-}\pi^{0}\pi^{0}$, as well f or subprocesses \phi \pi^{0}\pi^{0}$, $K^{+}(1460)K^{-}$, $K^{+}_{1}(1400)K^{-}$, $K^{+}_{1}(1270)K^{-}$ $K^{*+}(892)K^{*-}(892)$, are...
The processes X(3872)→D^{*0}D[over ¯]^{0}+c.c.,γJ/ψ,γψ(2S), and γD^{+}D^{-} are searched for in a 9.0 fb^{-1} data sample collected at center-of-mass energies between 4.178 4.278 GeV with the BESIII detector. We observe X(3872)→D^{*0}D^{0}[over ¯]+c.c. find evidence X(3872)→γJ/ψ statistical significances of 7.4σ 3.5σ, respectively. No evident signals X(3872)→γψ(2S) found, upper limit on relative branching ratio R_{γψ}≡{B[X(3872)→γψ(2S)]}/{B[X(3872)→γJ/ψ]}<0.59 is set 90% confidence level....
We report the first observation of semi-muonic decay $D^+\to \omega \mu^+\nu_\mu$ using an $e^+e^-$ collision data sample corresponding to integrated luminosity $2.93~\mathrm{fb}^{-1}$ collected with BESIII detector at a center-of-mass energy 3.773 GeV. The absolute branching fraction is measured be ${\mathcal B}_{D^+\to \omega\mu^+\nu_\mu}=(17.7\pm1.8_{\rm stat}\pm1.1_{\rm syst})\times 10^{-4}$. Its ratio world average value e^+\nu_e$ probes lepton flavor universality and it determined...
Using data samples with a total integrated luminosity of approximately 18 fb$^{-1}$ collected by the BESIII detector operating at BEPCII, process $e^+e^-\rightarrow\Lambda\bar{\Lambda} \eta$ is studied center-of-mass energies between 3.5106 and 4.6988 GeV. The Born cross section for $e^+e^-\rightarrow\Lambda\bar{\Lambda}\eta$ measured. No significant structure observed in line shape. An enhancement near $\Lambda\bar{\Lambda}$ mass threshold first time process. can be described an $S$-wave...
We report a measurement of the observed cross sections ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}X$ based on $3.21\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data accumulated at energies from 3.645 to 3.891 GeV with BESIII detector operated BEPCII collider. In analysis sections, we measured decay branching fractions...
A bstract Using a total of 5 . 25 fb − 1 e + collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation process → ηψ (2 S ) statistical significance 4.9 standard deviations. The sets were collected by BESIII detector operating at BEPCII storage ring. We measure yield events integrated over and also present energy dependence measured cross section.
A bstract By analyzing e + − annihilation data corresponding to an integrated luminosity of 2.93 fb 1 collected at a center-of-mass energy 3.773 GeV with the BESIII detector, first observation semileptonic decays $$ {D}^0\to {K}_S^0{\pi}^{-}{\pi}^0{e}^{+}{\nu}_e <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> </mml:msubsup> <mml:mi>π</mml:mi>...
Using <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mn>27.12</a:mn><a:mo>±</a:mo><a:mn>0.14</a:mn><a:mo stretchy="false">)</a:mo><a:mo>×</a:mo><a:msup><a:mrow><a:mn>10</a:mn></a:mrow><a:mrow><a:mn>8</a:mn></a:mrow></a:msup></a:mrow></a:math> <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mrow><e:mi>ψ</e:mi><e:mo stretchy="false">(</e:mo><e:mn>3686</e:mn><e:mo...
By analyzing $4.48\times10^8$ $\psi(3686)$ events collected with the BESIII detector, we observe decays $\chi_{cJ} \to n K^0_S\bar\Lambda + c.c.$ ($J=0$, 1, 2) for first time, via radiative transition $\psi(3686) \gamma \chi_{cJ}$. The branching fractions are determined to be $(6.67 \pm 0.26_{\rm stat} 0.41_{\rm syst})\times10^{-4}$, $(1.71 0.12_{\rm and $(3.66 0.17_{\rm 0.23_{\rm syst})\times10^{-4}$ $J=0$, 2, respectively.