A5043531259- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Neutrino Physics Research
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Nuclear physics research studies
- Superconducting Materials and Applications
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Quantum chaos and dynamical systems
- Stochastic processes and statistical mechanics
- advanced mathematical theories
- Laser-Matter Interactions and Applications
- Nuclear Physics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Algebra and Geometry
- Lanthanide and Transition Metal Complexes
- Distributed and Parallel Computing Systems
Johannes Gutenberg University Mainz
2013-2022
BASF (Switzerland)
2018-2019
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2018
University of the Basque Country
2018
Laboratoire d’Annecy de Physique des Particules
2018
Institut National de Physique Nucléaire et de Physique des Particules
2018
Centre National de la Recherche Scientifique
2018
Universitat de Barcelona
2018
China Center of Advanced Science and Technology
2015-2017
Beijing Institute of Petrochemical Technology
2015-2017
The cross section for the process $e^+e^-\to \pi^+\pi^-J/\psi$ is measured precisely at center-of-mass energies from 3.77 to 4.60~GeV using 9~fb$^{-1}$ of data collected with BESIII detector operating BEPCII storage ring. Two resonant structures are observed in a fit section. first resonance has mass $(4222.0\pm 3.1\pm 1.4)$~MeV/$c^2$ and width $(44.1\pm 4.3\pm 2.0)$~MeV, while second one $(4320.0\pm 10.4 \pm 7.0)$~MeV/$c^2$ $(101.4^{+25.3}_{-19.7}\pm 10.2)$~MeV, where errors statistical...
We extract the $e^+e^-\rightarrow \pi^+\pi^-$ cross section in energy range between 600 and 900 MeV, exploiting method of initial state radiation. A data set with an integrated luminosity 2.93 fb$^{-1}$ taken at a center-of-mass 3.773 GeV BESIII detector BEPCII collider is used. The measured systematic uncertainty 0.9%. pion form factor $|F_\pi|^2$ as well contribution to leading order hadronic vacuum polarization $(g-2)_\mu$. find this value be $a_\mu^{\pi\pi,\rm LO}(600-900\;\rm MeV) =...
The cross sections of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{h}_{c}$ at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating Beijing Electron Positron Collider. found be same order magnitude as those ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ 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.
We report the first measurement of absolute hadronic branching fractions ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryon at ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}$ production threshold, in 30 years since discovery. In total, 12 Cabibbo-favored decay modes are analyzed with a double-tag technique, based on sample $567\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$ collisions $\sqrt{s}=4.599\text{...
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 a data sample collected with the BESIII detector operating at BEPCII storage ring, we observe new neutral state Z_{c}(3900)^{0} significance of 10.4σ. The mass and width are measured to be 3894.8±2.3±3.2 MeV/c^{2} 29.6±8.2±8.2 MeV, respectively, where first error is statistical second systematic. Born cross section for e^{+}e^{-}→π^{0}π^{0}J/ψ fraction it attributable π^{0}Z_{c}(3900)^{0}→π^{0}π^{0}J/ψ in range E_{c.m.}=4.19-4.42 GeV also determined. We interpret this as partner...
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...
We study the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\psi}(3686)$ using $5.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected at 16 center-of-mass energy ($\sqrt{s}$) points from 4.008 to 4.600 GeV by BESIII detector operating BEPCII collider. The measured Born cross sections for are consistent with previous results, but much improved precision. A fit section shows contributions two...
We present a study of the process e+e−→π±(DD¯*)∓ using data samples 1092 pb−1 at s=4.23 GeV and 826 s=4.26 collected with BESIII detector BEPCII storage ring. With full reconstruction D meson pair bachelor π± in final state, we confirm existence charged structure Zc(3885)∓ (DD¯*)∓ system two isospin processes e+e−→π+D0D*− e+e−→π+D−D*0. By performing simultaneous fit, statistical significance signal is determined to be greater than 10σ, its pole mass width are measured...
The spin and parity of the $Z_c(3900)^\pm$ state are determined to be $J^P=1^+$ with a statistical significance larger than $7\sigma$ over other quantum numbers in partial wave analysis process $e^+e^-\to \pi^+\pi^-J/\psi$. We use data sample 1.92 fb$^{-1}$ accumulated at $\sqrt{s}=4.23$ 4.26 GeV BESIII experiment. When parameterizing Flatte-like formula, we determine its pole mass $M_\textrm{pole}=(3881.2\pm4.2_\textrm{stat}\pm52.7_\textrm{syst})\textrm{MeV}/c^2$ width...
In an analysis of a $2.92\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample taken at 3.773 GeV with the BESIII detector operated BEPCII collider, we measure absolute decay branching fractions $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{e}^{+}{\ensuremath{\nu}}_{e})=(3.505\ifmmode\pm\else\textpm\fi{}0.014\ifmmode\pm\else\textpm\fi{}0.033)%$ and...
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...
We report the first measurement of absolute branching fraction for Λ_{c}^{+}→Λe^{+}ν_{e}. This is based on 567 pb^{-1} e^{+}e^{-} annihilation data produced at sqrt[s]=4.599 GeV, which just above Λ_{c}^{+}Λ[over ¯]_{c}^{-} threshold. The were collected with BESIII detector BEPCII storage rings. determined to be B(Λ_{c}^{+}→Λe^{+}ν_{e})=[3.63±0.38(stat)±0.20(syst)]%, representing a significant improvement in precision over current indirect determination. As Λ_{c}^{+}→Λe^{+}ν_{e} benchmark...
We report a study of the process e^{+}e^{-}→(D^{*}D[over ¯]^{*})^{0}π^{0} using e^{+}e^{-} collision data samples with integrated luminosities 1092 pb^{-1} at sqrt[s]=4.23 GeV and 826 sqrt[s]=4.26 collected BESIII detector BEPCII storage ring. observe new neutral structure near (D^{*}D[over ¯]^{*})^{0} mass threshold in π^{0} recoil spectrum, which we denote as Z_{c}(4025)^{0}. Assuming Breit-Wigner line shape, its pole width are determined to be (4025.5_{-4.7}^{+2.0}±3.1) MeV/c^{2}...
A neutral structure in the DD[over ¯]^{*} system around mass threshold is observed with a statistical significance greater than 10σ processes e^{+}e^{-}→D^{+}D^{*-}π^{0}+c.c. and e^{+}e^{-}→D^{0}D[over ¯]^{*0}π^{0}+c.c. at sqrt[s]=4.226 4.257 GeV BESIII experiment. The denoted as Z_{c}(3885)^{0}. Assuming presence of resonance, its pole width are determined to be [3885.7_{-5.7}^{+4.3}(stat)±8.4(syst)] MeV/c^{2} [35_{-12}^{+11}(stat)±15(syst)] MeV, respectively. Born cross sections measured...
The process $e^{+}e^{-}\rightarrow\Lambda\bar{\Lambda}$ is studied using data samples at $\sqrt{s}=2.2324$, 2.400, 2.800 and 3.080 GeV collected with the BESIII detector operating BEPCII collider. Born cross section measured $\sqrt{s}$=2.2324 GeV, which 1.0 MeV above $\Lambda\bar{\Lambda}$ mass threshold, to be $305\pm45^{+66}_{-36}$ pb, where first uncertainty statistical second systematic. substantial near threshold significantly larger than that expected from theory, predicts vanish...
We search for the rare flavor-changing neutral current process $B^{+}\rightarrow K^{+}τ^{+}τ^{-}$ using data from BABAR experiment. The sample, collected at center-of-mass energy of $Υ{(4S)}$ resonance, corresponds to a total integrated luminosity 424 fb$^{-1}$ and 471 million $B\overline{B}$ pairs. reconstruct one $B$ meson, produced in $Υ{(4S)}\rightarrow B^{+} B^{-}$ decay, many hadronic decay modes activity compatible with K^{+} τ^{+}τ^{-}$ rest event. Each $τ$ lepton is required...
A measurement of the number J/ψ events collected with BESIII detector in 2009 and 2012 is performed using inclusive decays J/ψ. The taken recalculated to be (223.7 ± 1.4) × 106, which good agreement previous measurement, but significantly improved precision due improvements software. determined (1086.9 6.0) 106. In total, measured (1310.6 7.0) where uncertainty dominated by systematic effects statistical negligible.
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 present a measurement of the azimuthal asymmetries two charged pions in inclusive process e^{+}e^{-}→ππX, based on data set 62 pb^{-1} at center-of-mass energy 3.65 GeV collected with BESIII detector. These can be attributed to Collins fragmentation function. observe nonzero asymmetry, which increases increasing pion momentum. As our scale is close that existing semi-inclusive deep inelastic scattering experimental data, measured are important inputs for global analysis extracting quark...
We report the observation of X(3823) state in process e+e-→π+π-X(3823)→π+π-γχc1 with a statistical significance 6.2σ, data samples at center-of-mass energies sqrt[s]=4.230, 4.260, 4.360, 4.420, and 4.600 GeV collected BESIII detector BEPCII electron positron collider. The measured mass is (3821.7±1.3±0.7) MeV/c2, where first error second systematic, width less than 16 MeV 90% confidence level. products Born cross sections for e+e-→π+π-X(3823) branching ratio B[X(3823)→γχc1,c2] are also...
We report the first observation of Dalitz decay η′→γe+e−, based on a data sample 1.31 billion J/ψ events collected with BESIII detector. The η′ mesons are produced via J/ψ→γη′ process. ratio Γ(η′→γe+e−)/Γ(η′→γγ) is measured to be (2.13±0.09(stat)±0.07(sys))×10−2. This corresponds branching fraction B(η′→γe+e−)=(4.69±0.20(stat)±0.23(sys))×10−4. transition form factor extracted and different expressions compared dependence e+e− invariant mass. results consistent prediction vector meson...