S. J. Chen
A5063511565- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Radiomics and Machine Learning in Medical Imaging
- Computational Physics and Python Applications
- Neutrino Physics Research
- COVID-19 diagnosis using AI
- Advanced NMR Techniques and Applications
- Algorithms and Data Compression
- Dental Radiography and Imaging
- Cosmology and Gravitation Theories
Nanjing University
2014-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2024
CEA Paris-Saclay
2024
Tongji Hospital
2024
Huazhong University of Science and Technology
2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2024
The process of $e^+e^- \rightarrow p\bar{p}$ is studied at 22 center-of-mass energy points ($\sqrt{s}$) from 2.00 to 3.08 GeV, exploiting 688.5~pb$^{-1}$ data collected with the BESIII detector operating BEPCII collider. Born cross section~($\sigma_{p\bar{p}}$) measured energy-scan technique and it found be consistent previously published data, but much improved accuracy. In addition, electromagnetic form-factor ratio ($|G_{E}/G_{M}|$) value effective ($|G_{\rm{eff}}|$), electric ($|G_E|$)...
Evidence for the 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>p</a:mi><a:msup><a:mi>π</a:mi><a:mn>0</a:mn></a:msup></a:math> is reported first time with a statistical significance of <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mn>3.7</e:mn><e:mi>σ</e:mi></e:math> based on <g:math...
Using data samples with an integrated luminosity of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>22.42</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msup><a:mi>fb</a:mi><a:mrow><a:mo>−</a:mo><a:mn>1</a:mn></a:mrow></a:msup></a:math> collected by the BESIII detector operating at BEPCII storage ring, we measure cross sections <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Using 4.7 fb^{-1} of e^{+}e^{-} collision data at center-of-mass energies from 4.661 to 4.951 GeV collected by the BESIII detector BEPCII collider, we observe X(3872) production process e^{+}e^{-}→ωX(3872) for first time. The significance is 7.8σ, including both statistical and systematic uncertainties. Born cross section corresponding upper limit 90% confidence level each energy point are reported. line shape indicates that ωX(3872) signals may be decays some nontrivial structures.
Using $e^+e^-$ collision data at 13 center-of-mass energies ranging from 4.600 to 4.950 GeV collected with the BESIII detector, we search for unmeasured $e^+e^-\to K_S^0 h_c$ process . No significant signal is observed, and upper limits of Born cross sections each energy are presented.
Using a sample of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo>∼</a:mo><a:msup><a:mrow><a:mn>10</a:mn></a:mrow><a:mrow><a:mn>10</a:mn></a:mrow></a:msup><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:mrow></a:math> events collected by the BESIII detector at BEPCII collider, partial-wave analysis decay <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
A bstract Based on a data sample of (10087 ± 44) × 10 6 J / ψ events taken with the BESIII detector, we search for flavor-changing neutral current charmonium decay → D 0 μ + − c.c. . No significant signal above background is observed, and upper limit its branching fraction set to be ℬ( c.c.) < 1.1 7 at 90% confidence level. This marks first involving muons in final state.
A search for invisible decays of the $\mathrm{\ensuremath{\Lambda}}$ baryon is carried out in process $J/\ensuremath{\psi}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\overline{\mathrm{\ensuremath{\Lambda}}}$ based on $(1.0087\ifmmode\pm\else\textpm\fi{}0.0044)\ifmmode\times\else\texttimes\fi{}{10}^{10}\text{ }\text{ }J/\ensuremath{\psi}$ events collected with BESIII detector located at BEPCII storage ring. No signals are found baryon, and upper limit branching fraction determined to...
This study aimed to create a caries classification scheme based on cone-beam computed tomography (CBCT) and develop two deep learning models improve accuracy. A total of 2713 axial slices were obtained from CBCT images 204 carious teeth. Both trained tested using the same pretrained networks dataset, including ResNet50_vd, MobileNetV3_large_ssld, ResNet50_vd_ssld. The first model was used directly classify original (direct model). second incorporated presegmentation step for interpretation...
Abstract We study the hadronic decays of to final states and , using an annihilation data sample 567 pb -1 taken at a center-of-mass energy 4.6 GeV with BESIII detector BEPCII collider. find evidence for statistical significance respectively. Normalizing reference we obtain ratios branching fractions be The upper limits 90% confidence level are set . Using measurements decays, determine % (<0.68%) (<1.9%). Here, first uncertainties second systematic. obtained fraction is consistent...
Using 4.479×10^{8} ψ(3686) events collected with the BESIII detector, we search for decays ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ, where J=0, 1, 2. The χ_{cJ}→e^{+}e^{-}J/ψ are observed first time. measured branching fractions B(ψ(3686)→e^{+}e^{-}χ_{cJ})=(11.7±2.5±1.0)×10^{-4}, (8.6±0.3±0.6)×10^{-4}, (6.9±0.5±0.6)×10^{-4} 2, B(χ_{cJ}→e^{+}e^{-}J/ψ)=(1.51±0.30±0.13)×10^{-4}, (3.73±0.09±0.25)×10^{-3}, (2.48±0.08±0.16)×10^{-3} respectively. ratios of...
The absolute branching fraction of the decay <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mi mathvariant="normal">Λ</a:mi><a:mi>c</a:mi></a:msub><a:mo stretchy="false">(</a:mo><a:mn>2625</a:mn><a:msup><a:mo stretchy="false">)</a:mo><a:mo>+</a:mo></a:msup></a:mrow><a:mo stretchy="false">→</a:mo><a:msubsup><a:mi...
Using a sample of about 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 with the BESIII detector, we search for weak decays <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mi>J</c:mi><c:mo>/</c:mo><c:mi>ψ</c:mi><c:mo stretchy="false">→</c:mo><c:msup><c:mrow><c:mover accent="true"><c:mrow><c:mi>D</c:mi></c:mrow><c:mrow><c:mo...
Using a data sample collected with the BESIII detector operating at BEPCII storage ring center-of-mass energy of $\sqrt{s}=4.600$ GeV, we search for production $e^{+}e^{-} \to \phi\chi_{c0,1,2}$ and charmonium-like state $Y(4140)$ in radiative transition \gamma Y(4140)$ subsequently decaying into $\phi J/\psi$. The processes \phi\chi_{c1}$ $\phi\chi_{c2}$ are observed first time, each statistical significance more than 10\sigma, Born cross sections measured to be $(4.2^{+1.7}_{-1.0}\pm 0.3)$...
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....
The process $e^+e^-\rightarrow pK^{0}_{S}\bar{n}K^{-} + c.c.$ and its intermediate processes are studied for the first time, using data samples collected with BESIII detector at BEPCII center-of-mass energies of 3.773, 4.008, 4.226, 4.258, 4.358, 4.416, 4.600 GeV, a total integrated luminosity 7.4 fb$^{-1}$. Born cross section $e^+e^- \to p K^{0}_S\bar{n}K^- is measured each energy, but no significant resonant structure in cross-section line shape between 3.773 GeV observed. No evident...
Based on an $e^{+}e^{-}$ collision data sample corresponding to integrated luminosity of 2.93 $\mathrm{fb}^{-1}$ collected with the BESIII detector at $\sqrt{s}=3.773 \mathrm{GeV}$, first amplitude analysis singly Cabibbo-suppressed decay $D^{+}\to K^+ K_S^0 \pi^0$ is performed. From analysis, $K^*(892)^+ K_S^0$ component found be dominant a fraction $(57.1\pm2.6\pm4.2)\%$, where uncertainty statistical and second systematic. In combination absolute branching $\mathcal{B}(D^+\to \pi^0)$...
Based on $14.7~\textrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected with the BESIII detector at BEPCII collider 17 different center-of-mass energies between $3.7730~\textrm{GeV}$ and $4.5995~\textrm{GeV}$, Born cross sections two processes $e^+e^- \to p\bar{p}\eta$ p\bar{p}\omega$ are measured for first time. No indication resonant production through a vector state $V$ is observed, upper limits V $90\%$ confidence level calculated large parameter space in resonance masses widths. For...
Based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mo stretchy="false">(</a:mo><a:mn>2712.4</a:mn><a:mo>±</a:mo><a:mn>14.3</a:mn><a:mo stretchy="false">)</a:mo><a:mo>×</a:mo><a:msup><a:mn>10</a:mn><a:mn>6</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>3686</a:mn><a:mo stretchy="false">)</a:mo></a:math> events, we investigate four hadronic decay modes of the <g:math...
We measure the absolute branching fractions of semileptonic <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi>D</a:mi><a:mi>s</a:mi><a:mo>+</a:mo></a:msubsup></a:math> decays via <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:msup><c:mrow><c:mi>e</c:mi></c:mrow><c:mrow><c:mo>+</c:mo></c:mrow></c:msup><c:msup><c:mrow><c:mi>e</c:mi></c:mrow><c:mrow><c:mo>−</c:mo></c:mrow></c:msup><c:mo...
The inclusive cross sections of prompt $J/\psi$ and $\psi(3686)$ production are measured at center-of-mass energies from 3.808 to 4.951 GeV. dataset used is 22 fb$^{-1}$ $e^{+}e^{-}$ annihilation data collected with the BESIII detector operating BEPCII storage ring. results obtained in agreement previous measurements exclusive production. average values for energy ranges 4.527 GeV 4.843 $\psi(3686)$, where impact known resonances negligible, $14.0\pm1.7\pm3.1$ pb $15.3\pm3.0$ pb,...
Using $(10087\pm44)\times10^{6}$ $J/ψ$ events collected with the BESIII detector at BEPCII $e^+e^-$ storage ring center-of-mass energy of $\sqrt{s}=3.097~\rm{GeV}$, we present a search for rare semi-muonic charmonium decay $J/ψ\to D^{-}μ^{+}ν_μ+c.c.$. Since no significant signal is observed, set an upper limit branching fraction to be $\mathcal{B}(J/ψ\to D^{-}μ^{+}ν_μ+c.c.)<5.6\times10^{-7}$ $90\%$ confidence level. This first weak muon in final state.
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.