Z. J. Chen
A5115599238- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Recommender Systems and Techniques
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Advanced MRI Techniques and Applications
- Advanced Multi-Objective Optimization Algorithms
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Liver Disease Diagnosis and Treatment
- Advanced NMR Techniques and Applications
- Advanced Bandit Algorithms Research
- Cardiac Imaging and Diagnostics
- Advanced Graph Neural Networks
- Black Holes and Theoretical Physics
- MRI in cancer diagnosis
- Technology Adoption and User Behaviour
- Impact of Technology on Adolescents
- Online Learning and Analytics
- Text and Document Classification Technologies
Anhui University
2024-2025
Hunan University
2021-2024
Guangdong University of Technology
2024
Chinese Academy of Sciences
2023
Beijing Institute of Technology
2023
Institute of Information Engineering
2023
State Key Laboratory of Cryptology
2023
Southeast University
2023
Hanshan Normal University
2023
We report a study of the processes e+e−→K+D−sD*0 and K+D*−sD0 based on e+e− annihilation samples collected with BESIII detector operating at BEPCII five center-of-mass energies ranging from 4.628 to 4.698 GeV total integrated luminosity 3.7 fb−1. An excess events over known contributions conventional charmed mesons is observed near D−sD*0 D*−sD0 mass thresholds in K+ recoil-mass spectrum for √s=4.681 GeV. The structure matches mass-dependent-width Breit-Wigner line shape, whose pole width...
Abstract From December 2019 to June 2021, the BESIII experiment collected approximately 5.85 fb −1 of data at center-of-mass energies between 4.61 and 4.95 GeV. This is highest collision energy BEPCII has reached date. The accumulated annihilation samples are useful for studying charmonium(-like) states charmed-hadron decays. By adopting a novel method analyzing production pairs in annihilation, measured with precision 0.6 MeV. Integrated luminosities better than 1% by events large-angle...
Using a sample of $1.31\times10^9$ $J/\psi$ events collected with the BESIII detector at electron-positron collider BEPCII, we analyse full $J/\psi \to$ $\Xi^-\overline{\Xi}^+$, $\Xi^-\to \Lambda \pi^-$, $\Lambda\to p\pi^-$, $\overline{\Xi}^+\to\overline{\Lambda}\pi^+$, $\overline{\Lambda}\to\overline{p}\pi^+$ decay chain. A new method, exploiting fact that $\Xi^-\overline{\Xi}^+$ pair is entangled and sequentially decaying, where complete chains are reconstructed, applied for first time....
Based on a sample of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mn>448.1</a:mn><a:mo>±</a:mo><a:mn>2.9</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>6</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...
We present the first observation of singly Cabibbo-suppressed decay <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi mathvariant="normal">Λ</a:mi><a:mi>c</a:mi><a:mo>+</a:mo></a:msubsup><a:mo stretchy="false">→</a:mo><a:mi mathvariant="normal">Λ</a:mi><a:msup><a:mi>K</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>π</a:mi><a:mn>0</a:mn></a:msup></a:math> with a significance <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...
Using a sample of 10 billion <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:math> events collected with the BESIII detector, decays <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>η</c:mi><c:mo>′</c:mo></c:msup><c:mo...
Multi-objective evolutionary algorithms (MOEAs) have been proved to be competitive in recommender systems. As the application scenarios of systems become increasingly complex, number objectives considered increases. However, most existing multi-objective recommendation lead increased environmental selection pressure as To tackle issue, this paper, we propose a multi-population based algorithm named MP-MORS for many-objective recommendations, where two subpopulations and one major population...
Using a data sample corresponding to an integrated luminosity of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>10.9</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msup><a:mrow><a:mi>fb</a:mi></a:mrow><a:mrow><a:mo>−</a:mo><a:mn>1</a:mn></a:mrow></a:msup></a:mrow></a:math> collected at center-of-mass energies from 4.16 4.34 GeV with the BESIII detector, we search for decay <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
The first observation of the decays <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mo stretchy="false">→</a:mo><a:mover accent="true"><a:mrow><a:mi>p</a:mi></a:mrow><a:mrow><a:mo stretchy="false">¯</a:mo></a:mrow></a:mover><a:msup><a:mrow><a:mi...
Based on a data sample of 10 billion <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:math> events collected with the BESIII detector, improved measurements Dalitz decays <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>η</c:mi><c:mo>/</c:mo><c:msup><c:mi>η</c:mi><c:mo>′</c:mo></c:msup><c:mo...
Based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><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:mn>10</a:mn><a:mn>8</a:mn></a:msup><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>ψ</a:mi><a:mo stretchy="false">(</a:mo><a:mn>2</a:mn><a:mi>S</a:mi><a:mo stretchy="false">)</a:mo></a:math> events collected by the BESIII detector, we search for decay <g:math...
Using an ${e}^{+}{e}^{\ensuremath{-}}$ collision data sample of $(10\phantom{\rule{0.16em}{0ex}}087\ifmmode\pm\else\textpm\fi{}44)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $J/\ensuremath{\psi}$ events taken at the center-of-mass energy 3.097 GeV by BESIII detector BEPCII collider, process $\mathrm{\ensuremath{\Lambda}}+N\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{+}+X$ is studied for first time employing a novel method. The ${\mathrm{\ensuremath{\Sigma}}}^{+}$ hyperons are...
Using data samples collected with the BESIII detector operating at BEPCII storage ring, we measure cross sections of $e^{+}e^{-}\rightarrow\pi^{+}\pi^{-}D^{+}D^{-}$ process center-of-mass energies from 4.190 to 4.946 GeV a partial reconstruction method. Two resonance structures are seen and parameters determined fit section line shape. The first observe has mass (4373.1 $\pm$ 4.0 2.2) MeV/$c^2$ width (146.5 7.4 1.3) MeV, in agreement those $Y(4390)$ state; other (4706 11 4) MeV/$c^2$, (45 28...
The study of the Cabibbo-favored semileptonic decay ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ is reported using $4.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected at center-of-mass energies ranging from 4.600 to 4.699 GeV. branching fraction measured be...
A bstract Based on 4.5 fb − 1 e + collision data collected with BESIII detector at seven energy points between 4.600 and 4.699 GeV, the branching fractions for $$ {\Lambda}_c^{+}\to p\eta <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:mo>→</mml:mo><mml:mi>pη</mml:mi></mml:math> p\omega...
Using a sample of about 10^{10} J/ψ events collected at center-of-mass energy sqrt[s]=3.097 GeV with the BESIII detector, electromagnetic Dalitz decays J/ψ→e^{+}e^{-}π^{+}π^{-}η^{'}, η^{'}→γπ^{+}π^{-} and η^{'}→π^{+}π^{-}η, have been studied. The decay J/ψ→e^{+}e^{-}X(1835) is observed significance 15σ, also an e^{+}e^{-} invariant-mass dependent transition form factor presented for first time. intermediate states X(2120) X(2370) are in π^{+}π^{-}η^{'} spectrum significances 5.3σ 7.3σ....
Based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>4.5</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msup><a:mrow><a:mi>fb</a:mi></a:mrow><a:mrow><a:mo>−</a:mo><a:mn>1</a:mn></a:mrow></a:msup></a:mrow></a:math> of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>e</c:mi><c:mo>+</c:mo></c:msup><c:msup><c:mi>e</c:mi><c:mo>−</c:mo></c:msup></c:math> collision data accumulated at center-of-mass energies between...
Using <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>e</a:mi><a:mo>+</a:mo></a:msup><a:msup><a:mi>e</a:mi><a:mo>−</a:mo></a:msup></a:math> collision data collected with the BESIII detector operating at BEPCII collider, Born cross sections of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Using an $e^+ e^-$ collision data sample with a total integrated luminosity of $3.19$ fb$^{-1}$ collected the BESIII detector at center-of-mass energy 4.178 GeV, branching fraction inclusive decay $D_s^+$ meson to final states including least three charged pions is measured for first time be ${\cal B}(D_s^+\to\pi^+ \pi^+ \pi^- X) = (32.81 \pm 0.35_{\rm stat} {0.63_{\rm syst}})\%$. In this measurement from $K_S^0$ decays are excluded. The partial fractions $D_s^+\to\pi^+ X$ also as function...
Using $(1.0087\ifmmode\pm\else\textpm\fi{}0.0044)\ifmmode\times\else\texttimes\fi{}{10}^{10}\text{ }\text{ }J/\ensuremath{\psi}$ events collected by the BESIII detector at BEPCII collider, we report first search for baryon and lepton number violating decays ${\mathrm{\ensuremath{\Xi}}}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{e}^{+}$ with $\mathrm{\ensuremath{\Delta}}(B\ensuremath{-}L)=0$ ${\mathrm{\ensuremath{\Xi}}}^{0}\ensuremath{\rightarrow}{K}^{+}{e}^{\ensuremath{-}}$...
Quantum-correlated $D\overline{D}$ pairs collected by the BESIII experiment at $\ensuremath{\psi}(3770)$ resonance corresponding to an integrated luminosity of $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ are used study ${D}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ decay mode. The $CP$-even fraction decays is determined be $0.235\ifmmode\pm\else\textpm\fi{}0.010\ifmmode\pm\else\textpm\fi{}0.002$, where...