M. L. Chen
A5068527765- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Advanced Algorithms and Applications
- Atomic and Subatomic Physics Research
- Recycling and Waste Management Techniques
- Neutrino Physics Research
- Urologic and reproductive health conditions
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Robotics and Automated Systems
- Cold Atom Physics and Bose-Einstein Condensates
- Industrial Vision Systems and Defect Detection
- Scientific and Engineering Research Topics
- Robotics and Sensor-Based Localization
- Particle Detector Development and Performance
University of Chinese Academy of Sciences
2024-2025
Institute of High Energy Physics
2004-2025
Chinese Academy of Sciences
2024
Shanghai Ocean University
2024
Based on a sample of $2.25\ifmmode\times\else\texttimes\fi{}{10}^{8}J/\ensuremath{\psi}$ events taken with the BESIII detector at BEPCII collider, we present results study decay $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\phi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. The $Y(2175)$ resonance is observed in invariant mass spectrum $\ensuremath{\phi}{f}_{0}(980)$ statistical significance greater than $10\ensuremath{\sigma}$. corresponding and...
We study the singly-Cabibbo-suppressed decays $\Lambda_c^{+}\to p\eta$ and $\Lambda_{c}^{+}\to p\pi^{0}$ using $\Lambda_{c}^{+}\Lambda_{c}^{+}$ pairs produced by $e^+e^-$ collisions at a center-of-mass energy of $\sqrt{s} = 4.6\; GeV$. The data sample was collected BESIII detector BEPCII collider corresponds to an integrated luminosity 567 $pb^{-1}$. find first evidence for decay p \eta$ with statistical significance $4.2\sigma$ measure its branching fraction be $\mathcal{B}(\Lambda_c^+\to...
Using <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><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:mrow><a:mn>10</a:mn></a:mrow><a:mrow><a:mn>6</a:mn></a:mrow></a:msup><a:mi>ψ</a:mi><a:mo stretchy="false">(</a:mo><a:mn>3686</a:mn><a:mo stretchy="false">)</a:mo></a:mrow></a:math> events collected by the BESIII detector operating at BEPCII collider, we present first...
Using <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>7.93</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 collected at a center-of-mass energy 3.773 GeV with...
A bstract Using e + − collision data corresponding to a total integrated luminosity of 12.9 fb 1 collected with the BESIII detector at BEPCII collider, exclusive Born cross sections and effective form factors reaction $$ {e}^{+}{e}^{-}\to {\Xi}^{-}{\overline{\Xi}}^{+} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>−</mml:mo> <mml:mo>→</mml:mo> <mml:mi>Ξ</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover>...
Solenoid connectors play important role in electronic stability system design, with the features of small size, low cost, fast response time and high reliability. The main production process challenge for solenoid is accurate detection defects, which closely related to safe driving. Both faultless defective products have similar color shape at defect location, making proper inspection challenging. To address these issues, we proposed a model called PO-YOLOv5 achieve connectors. First, an...
Using <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>2.93</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> 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 collected with the BESIII detector at center-of-mass energy 3.773 GeV, we investigate...
The absolute branching fraction of $D^+ \to \mu^+ \nu$ has been directly measured by an analysis a data sample about 33 ${\rm pb^{-1}}$ collected around $\sqrt{s}=3.773$ GeV with the BES-II at BEPC. At these energies, $D^-$ meson is produced in pair as $e^+e^-\to D^{+} D^{-}$. A total $5321 \pm 149 160$ mesons are reconstructed from this set. In recoil side tagged mesons, $2.67\pm1.74$ purely leptonic decay events observed. This yields $BF(D^+ \nu_{\mu}) = (0.122^{+0.111}_{-0.053}\pm...
The processes ψ′→p¯pπ0 and ψ′→p¯pη are studied using a sample of 14×106 ψ′ decays collected with the Beijing Spectrometer at Electron-Positron Collider. branching fraction is measured improved precision as (13.2±1.0±1.5)×10−5, observed for first time (5.8±1.1±0.7)×10−5, where errors statistical second ones systematic.1 MoreReceived 1 March 2005DOI:https://doi.org/10.1103/PhysRevD.71.072006©2005 American Physical Society
We observe for the first time process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}{h}_{c}$ with data collected by BESIII experiment. Significant signals are observed at center-of-mass energy $\sqrt{s}=4.226\text{ }\text{ }\mathrm{GeV}$, and Born cross section is measured to be $(9.{5}_{\ensuremath{-}2.0}^{+2.2}\ifmmode\pm\else\textpm\fi{}2.7)\text{ }\mathrm{pb}$. Evidence $\ensuremath{\eta}{h}_{c}$ $\sqrt{s}=4.358\text{ }\mathrm{GeV}$ a of...
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...
A bstract Based on e + − collision samples corresponding to an integrated luminosity of 4.4 fb 1 collected with the BESIII detector at center-of-mass energies between 4 . 6 GeV and 7 GeV, a partial wave analysis charmed baryon hadronic decay $$ {\Lambda}_c^{+} <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:math> → Λ π 0 is performed, decays ρ (770) Σ(1385) are studied for first time. Making use...
Based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mn>2712.4</a:mn><a:mo>±</a:mo><a:mn>14.1</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...
Analyzing <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 corresponding to an integrated luminosity of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mn>7.33</c:mn><c:mtext> </c:mtext><c:mtext> </c:mtext><c:msup><c:mi>fb</c:mi><c:mrow><c:mo>−</c:mo><c:mn>1</c:mn></c:mrow></c:msup></c:math> collected at center-of-mass energies...
Based on $448.1 \times 10^6$ $\psi(3686)$ events collected with the BESIII detector, decays $\psi(3686)\to\gamma\chi_{cJ}, \chi_{cJ} \to \gamma\gamma~(J=0, 1, 2)$ are studied. The decay branching fractions of $\chi_{c0,c2} \gamma\gamma$ measured to be $\mathcal{B}(\chi_{c0}\to\gamma\gamma) = (1.93 \pm 0.08 0.05 0.05)\times 10^{-4}$ and $\mathcal{B}(\chi_{c2}\to\gamma\gamma) (3.10 0.09 0.07 0.11)\times 10^{-4} $, which correspond two-photon widths $\Gamma_{\gamma\gamma}(\chi_{c0}) 2.03 0.06...
Using $2.25\times10^{8}$ $J/\psi$ events collected with the BESIII detector at BEPCII storage rings, we observe for first time process $J/\psi\rightarrow p\bar{p}a_{0}(980)$, $a_{0}(980)\rightarrow \pi^{0}\eta$ a significance of $6.5\sigma$ ($3.2\sigma$ including systematic uncertainties). The product branching fraction p\bar{p}a_{0}(980)\rightarrow p\bar{p}\pi^{0}\eta$ is measured to be $(6.8\pm1.2\pm1.3)\times 10^{-5}$, where error statistical and second systematic. This measurement...
Based on 5.8×107J/ψ events detected in BESII, the branching fractions of J/ψ→ϕη and ϕη′ are measured for different η η′ decay modes. The results significantly higher than previous measurements. An upper limit B(J/ψ→ϕπ0) is also obtained.3 MoreReceived 15 October 2004DOI:https://doi.org/10.1103/PhysRevD.71.032003©2005 American Physical Society
Using data samples collected at $\sqrt{s}=3.686\text{ }\text{ }\mathrm{GeV}$ and 3.650 GeV by the BESII detector BEPC, branching fraction of $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}3({\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ is measured to be $[5.45\ifmmode\pm\else\textpm\fi{}0.42(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.87(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, relative...
The Born cross sections for the process $e^{+}e^{-}\to \omega\eta^{\prime}$ are measured at 22 center-of-mass energies from 2.000 to 3.080 GeV using data collected with BESIII detector BEPCII collider. A resonant structure is observed a statistical significance of 9.6$\sigma$. Breit-Wigner fit determines its mass be $M_R=(2153\pm30\pm31)~{\rm{MeV}}/c^{2}$ and width $\Gamma_{R}=(167\pm77\pm7)~\rm{MeV}$, where first uncertainties second systematic.
A bstract The branching fraction of $$ {D}^{+}\to {K}_S^0{\pi}^0{e}^{+}{\nu}_e <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mi>π</mml:mi> <mml:mi>e</mml:mi> <mml:msub> <mml:mi>ν</mml:mi> </mml:msub> </mml:math> is measured for the first time using 7.93 fb − 1 e + annihilation data collected at center-of-mass...
Using 58 million $J/\ensuremath{\psi}$ events taken with the BES II detector at Beijing Electron Positron Collider, decay $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}{f}_{2}(1270){f}_{2}(1270)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ is observed, and branching fraction...
We report the measurement of inclusive cross sections for $e^+e^-$$\rightarrow$nOCH (where nOCH denotes non-open charm hadrons) with improved precision at center-of-mass (c.m.) energies from 3.645 to 3.871 GeV. observe three resonances: $\mathcal R(3760)$, R(3780)$, and R(3810)$ significances $8.1\sigma$, $13.7\sigma$, $8.8\sigma$, respectively. The state is observed first time, while R(3760)$ R(3780)$ states are time in sections. Two sets resonance parameters describe energy-dependent line...
The cross sections of the $e^{+}e^{-}\to\phi\eta'$ process at center-of-mass energies from 3.508 to 4.951 GeV are measured with high precision using 26.1 fb$^{-1}$ data collected BESIII detector operating BEPCII storage ring. order a few picobarn, and decrease as energy increases $s^{-n/2}$ $n=4.35\pm 0.14$. This result is in agreement Nambu-Jona-Lasinio model prediction $n=3.5\pm 0.9$. In addition, charmless decay $\psi(3770)\to\phi\eta'$ searched for by fitting sections, yet no significant...
We present a study of the process $e^{+}e^{-}\to\eta\phi$ using data samples collected with BESIII detector corresponding to an integrated luminosity 15.03 fb$^{-1}$ at 23 center-of-mass energies from 3.773 4.600 GeV. The Born cross sections are measured each energy and coherent fit cross-section lineshape is performed Breit-Wigner parametrization search for charmonium-like vector states. No significant signals $Y(4230)$ $Y(4360)$ resonances observed.