A5101401005- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Neutrino Physics Research
- Advanced X-ray Imaging Techniques
- Radiation Therapy and Dosimetry
- Medical Imaging Techniques and Applications
- Photonic and Optical Devices
- Adaptive optics and wavefront sensing
- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Advancements in Photolithography Techniques
- Distributed and Parallel Computing Systems
- Data Analysis with R
- Scientific Measurement and Uncertainty Evaluation
Princip (Czechia)
2025
Chinese Academy of Sciences
2012-2024
China Spallation Neutron Source
2022-2024
Institute of High Energy Physics
2012-2024
Centre National de la Recherche Scientifique
2019-2024
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2024
Shandong Provincial Hospital
2022
Shandong University
2017-2022
GANIL
2019
Institut National de Physique Nucléaire et de Physique des Particules
2019
We study the process ee+ e- → π+ π- J/ψ at a center-of-mass energy of 4.260 GeV using 525 pb(-1) data sample collected with BESIII detector operating Beijing Electron Positron Collider. The Born cross section is measured to be (62.9±1.9±3.7) pb, consistent production Y(4260). observe structure around 3.9 GeV/c2 in π(±)J/ψ mass spectrum, which we refer as Z(c)(3900). If interpreted new particle, it unusual that carries an electric charge and couples charmonium. A fit invariant neglecting...
We study e+e-→π+π-hc at center-of-mass energies from 3.90 to 4.42 GeV by using data samples collected with the BESIII detector operating Beijing Electron Positron Collider. The Born cross sections are measured 13 and found be of same order magnitude as those e+e-→π+π-J/ψ but a different line shape. In π±hc mass spectrum, distinct structure, referred Zc(4020), is observed 4.02 GeV/c2. Zc(4020) carries an electric charge couples charmonium. A fit invariant neglecting possible interferences,...
We study the process e+e−→(D∗¯D∗)±π∓ at a center-of-mass energy of 4.26 GeV using 827 pb−1 data sample obtained with BESIII detector Beijing Electron Positron Collider. Based on partial reconstruction technique, Born cross section is measured to be (137±9±15) pb. observe structure near (D∗¯D∗)± threshold in π∓ recoil mass spectrum, which we denote as Z±c(4025). The and width are (4026.3±2.6±3.7) MeV/c2 (24.8±5.6±7.7) MeV, respectively. Its production ratio...
We report values of R = sigma(e(+)e(-)-->hadrons)/sigma(e(+)e(-)-->mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at Electron-Positron Collider.
Hadronic transitions of ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ($J=0$, 1, 2) are searched for using a sample $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ $\ensuremath{\psi}(3686)$ events collected with the BESIII detector at BEPCII storage ring. The ${\ensuremath{\eta}}_{c}$ is reconstructed ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ and...
From December 2011 to May 2014, about 5 fb−1 of data were taken with the BESIII detector at center-of-mass energies between 3.810 GeV and 4.600 study charmonium-like states higher excited charmonium states. The time-integrated luminosity collected sample is measured a precision 1% by analyzing events produced large-angle Bhabha scattering process.
Data sets were collected with the BESIII detector at BEPCII collider center-of-mass energy of √s = 3.650 GeV during May 2009 and 3.773 from January 2010 to 2011. By analyzing large angle Bhabha scattering events, integrated luminosities two data are measured be (44.49±0.02±0.44) pb−1 (2916.94±0.18±29.17) pb−1, respectively, where first error is statistical second systematic.
Based on data samples collected with the BESIII detector at BEPCII collider nine center of mass energies from 4.21 to 4.42 GeV, we search for production e^{+}e^{-}→ωχ_{cJ} (J=0, 1, 2). The process e^{+}e^{-}→ωχ_{c0} is observed first time, and Born cross sections sqrt[s]=4.23 4.26 GeV are measured be (55.4±6.0±5.9) (23.7±5.3±3.5) pb, respectively, where uncertainties statistical second systematic. ωχ_{c0} signals other seven e^{+}e^{-}→ωχ_{c1} ωχ_{c2} not significant, upper limits...
Using data collected with the BESIII detector operating at Beijing Electron Positron Collider center-of-mass energies of sqrt[s]=4.23, 4.26, and 4.36 GeV, we observe e(+)e(-)→π(0)π(0)hc for first time. The Born cross sections are measured found to be about half those e(+)e(-)→π(+)π(-)hc within less than 2σ. In π(0)hc mass spectrum, a structure 4.02 GeV/c(2) is found. It most likely neutral isospin partner Zc(4020)(±) observed in process being A fit invariant width Zc(4020)(0) fixed that its...
The decays J/ψ → γ π+ π- π0 and are analyzed using a sample of 225×10(6) events collected with the BESIII detector. decay η(1405) f(0)(980)π0 large isospin violation is observed for first time. width f(0)(980) in dipion mass spectra anomalously narrower than world average. Decay rates three-pion η' also measured precisely.
A partial wave analysis of the $p\overline{p}$ mass-threshold enhancement in reaction $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{p}$ is used to determine its ${J}^{\mathrm{PC}}$ quantum numbers be ${0}^{\ensuremath{-}+}$, peak mass below threshold at $M={1832}_{\ensuremath{-}5}^{+19}(\mathrm{stat}{)}_{\ensuremath{-}17}^{+18}(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}19(\mathrm{model})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, and total width...
Using data samples collected with the BESIII detector at BEPCII collider, we measure Born cross section of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}p\overline{p}$ 12 center-of-mass energies from 2232.4 to 3671.0 MeV. The corresponding effective electromagnetic form factor proton is deduced under assumption that electric and magnetic factors are equal $(|{G}_{E}|=|{G}_{M}|)$. In addition, ratio factors, $|{G}_{E}/{G}_{M}|$, $|{G}_{M}|$ extracted by fitting polar angle distribution...
The numbers of $\psi(3686)$ events accumulated by the BESIII detector for two rounds data taking during 2009 and 2012 are determined to be $(107.0\pm0.8)\times 10^6$ $(341.1\pm 2.1)\times 10^6$, respectively, counting inclusive hadronic events, where uncertainty is dominated systematics statistical negligible. number sample taken in consistent with that previous measurement. total data-taking periods $(448.1\pm2.9)\times10^6$.
Abstract CompactLight is a Design Study funded by the European Union under Horizon 2020 research and innovation funding programme, with Grant Agreement No. 777431. was conducted an International Collaboration of 23 international laboratories academic institutions, three private companies, five third parties. The project, which started in January 2018 duration 48 months, aimed to design innovative, compact, cost-effective hard X-ray FEL facility complemented soft source pave road for future...
The BES experiment at the Beijing electron-positron collider has observed ξ(2230) signal in π+π−, K+K−, K0SK0S, and p¯p final states with 4.6σ, 4.1σ, 4.0σ, 3.8σ statistical significances, respectively. new observations of two nonstrange decay modes ξ→π+π− are important evidence for glueball interpretation ξ(2230).Received 30 October 1995DOI:https://doi.org/10.1103/PhysRevLett.76.3502©1996 American Physical Society
The number of J/ψ events collected with the BESIII detector at BEPCII from June 12 to July 28, 2009 is determined be (225.3±2.8) × 106 using →inclusive events, where uncertainty systematic error and statistical one negligible.
The cross section for e^+e^- \to \eta J/\psi between \sqrt{s}=3.8 GeV/c^2 and 5.3 is measured via initial state radiation using 980 fb^{-1} of data on around the \Upsilon(nS)(n=1,2,3,4,5) resonances collected with Belle detector at KEKB. Two resonant structures \psi(4040) \psi(4160) are observed in invariant mass distribution. Fitting spectrum coherent sum two Breit-Wigner functions, one obtains BR(\psi(4040)\to\eta J/\psi)\cdot\Gamma_{ee}^{\psi(4040)} = (4.8\pm0.9\pm1.4) eV...
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 report a measurement of the branching fraction B(D+→μ+νμ)=[3.71±0.19(stat)±0.06(sys)]×10−4 based on 2.92 fb−1 data accumulated at √s=3.773 GeV with BESIII detector BEPCII collider. This measurement, in conjunction Cabibbo-Kobayashi-Maskawa matrix element |Vcd| determined from global Standard Model fit, implies value for weak decay constant fD+=(203.2±5.3±1.8) MeV. Additionally, using this together lattice QCD prediction fD+, we find |Vcd|=0.2210±0.0058±0.0047. In either case, these are...
We report an observation of the process J/ψ→γX(1835)→γK_{S}^{0}K_{S}^{0}η at low K_{S}^{0}K_{S}^{0} mass with a statistical significance larger than 12.9σ using data sample 1.31×10^{9} J/ψ events collected BESIII detector. In this region phase space system is dominantly produced through f_{0}(980). By performing partial wave analysis, we determine spin parity X(1835) to be J^{PC}=0^{-+}. The and width observed are 1844±9(stat)_{-25}^{+16}(syst) MeV/c^{2}...
We study $D^0\overline{D}{}^0$ pairs produced in $e^+e^-$ collisions at $\sqrt{s}=3.773$ GeV using a data sample of 2.92 fb$^{-1}$ collected with the BESIII detector. measure asymmetry $\mathcal{A}^{CP}_{K\pi}$ branching fractions $D \to K^-\pi^+$ $CP$-odd and $CP$-even eigenstates to be $(12.7\pm1.3\pm0.7)\times10^{-2}$. can used extract strong phase difference $\delta_{K\pi}$ between doubly Cabibbo-suppressed process $\overline{D}{}^{0}\to Cabibbo-favored $D^0\to K^- \pi^+$. Using...
An energy scan near the $\ensuremath{\tau}$ pair production threshold has been performed using BESIII detector. About $24\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of data, distributed over four points, were collected. This analysis is based on decays to $ee$, $e\ensuremath{\mu}$, $eh$, $\ensuremath{\mu}\ensuremath{\mu}$, $\ensuremath{\mu}h$, $hh$, $e\ensuremath{\rho}$, $\ensuremath{\mu}\ensuremath{\rho}$ and $\ensuremath{\pi}\ensuremath{\rho}$ final states, where $h$ denotes a charged...
Using a data set of 2.93 fb$^{-1}$ taken at center-of-mass energy $\sqrt{s}$ = 3.773 GeV with the BESIII detector BEPCII collider, we perform search for an extra U(1) gauge boson, also denoted as dark photon. We examine initial state radiation reactions $e^+e^-\rightarrow e^+e^-\gamma_{\rm ISR}$ and \mu^+\mu^-\gamma_{\rm this search, where photon would appear enhancement in invariant mass distribution leptonic pairs. observe no obvious range between 1.5 3.4 GeV/$c^{2}$ 90% confidence level...