A5059715513- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- X-ray Diffraction in Crystallography
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Crystallization and Solubility Studies
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Medical Imaging Techniques and Applications
- CCD and CMOS Imaging Sensors
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Cosmology and Gravitation Theories
- Radiation Effects in Electronics
- Superconducting Materials and Applications
- Stochastic processes and statistical mechanics
- advanced mathematical theories
- Photocathodes and Microchannel Plates
Institute of High Energy Physics
2018-2024
University of Turin
2017-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2016-2024
Fudan University
2024
Institute of Modern Physics
2024
Donostia International Physics Center
2022-2024
Basque Centre for Climate Change
2022-2024
Ruhr University Bochum
2024
Central China Normal University
2024
University of the Basque Country
2023-2024
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...
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>10</a:mn><a:mn>087</a:mn><a:mo>±</a:mo><a:mn>44</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: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 with the BESIII detector, a partial wave analysis of decay <e:math...
Abstract The number of ψ (3686) events collected by the BESIII detector during 2021 run period is determined to be (2259.3±11.1)×10 6 counting inclusive hadronic events. uncertainty systematic and statistical negligible. Meanwhile, numbers 2009 2012 periods are updated (107.7±0.6)×10 (345.4±2.6)×10 , respectively. Both consistent with previous measurements within one standard deviation. total in three data samples (2712.4±14.3)×10 .
There has recently been a dramatic renewal of interest in the subjects hadron spectroscopy and charm physics. This renaissance driven part by discovery plethora charmonium-like $XYZ$ states at BESIII $B$ factories, observation an intriguing proton-antiproton threshold enhancement possibly related $X(1835)$ meson state BESIII, as well measurements mesons baryons. We present detailed survey important topics tau-charm physics that can be further explored over remaining lifetime BEPCII...
The Born cross section of the $e^{+}e^{-}~\rightarrow~\Lambda_{c}^{+} \bar{\Lambda}_{c}^{-}$ process is measured with unprecedented precision using data collected BESIII detector at $\sqrt{s}=4574.5$, $45580.0$, $4590.0$ and $4599.5$ $\mathrm{MeV}$. non-zero near $\Lambda_{c}^{+} production threshold discerned. At center-of-mass energies $\sqrt{s}=4574.5$ $4599.5 $ $\mathrm{MeV}$, higher statistics enable us to measure $\Lambda_{c}$ polar angle distributions. From these, ratio between...
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 ($|G_E|$)...
The cross section of the process $e^{+} e^{-} \rightarrow K^{+} K^{-}$ is measured at a number center-of-mass energies $\sqrt{s}$ from 2.00 to 3.08 GeV with BESIII detector Beijing Electron Positron Collider (BEPCII). results provide best precision achieved so far. A resonant structure around 2.2 observed in line shape. Breit-Wigner fit yields mass $M=2239.2 \pm 7.1 11.3$~and width $\Gamma=139.8\pm12.3\pm20.6$ MeV, where first uncertainties are statistical and second ones systematic. In...
Abstract Using inclusive decays of , a precise determination the number events collected with BESIII detector was performed. For two data sets taken in 2009 and 2012, numbers were recalculated to be respectively; these are good agreement previous measurements. sample 2017–2019, determined . The total where uncertainty is dominated by systematic effects, statistical negligible.
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....
Abstract The integrated luminosities of data samples collected in the BESIII experiment 2016–2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events. old datasets 2010–2014 updated considering corrections related to detector performance, offsetting effect newly discovered readout errors electromagnetic calorimeter, which can haphazardly occur.
Using a sample of (10.09±0.04)×10^{9} J/ψ events collected with the BESIII detector operating at BEPCII storage ring, partial wave analysis decay J/ψ→γηη^{'} is performed. The first observation an isoscalar state exotic quantum numbers J^{PC}=1^{-+}, denoted as η_{1}(1855), reported in process J/ψ→γη_{1}(1855) η_{1}(1855)→ηη^{'}. Its mass and width are measured to be (1855±9_{-1}^{+6}) MeV/c^{2} (188±18_{-8}^{+3}) MeV, respectively, where uncertainties statistical second systematic, its...
Based on 10 billion J/ψ events collected at the BESIII experiment, a search for CP violation in Λ decay is performed difference between CP-odd parameters α_{-} Λ→pπ^{-} and α_{+} Λ[over ¯]→p[over ¯]π^{+} by using process e^{+}e^{-}→J/ψ→ΛΛ[over ¯]. With five-dimensional fit to full angular distributions of daughter baryon, most precise values are determined be α_{-}=0.7519±0.0036±0.0024 α_{+}=-0.7559±0.0036±0.0030, respectively. The ¯] averaged value parameter extracted...
We search for an axion-like particle (ALP) $a$ through the process $\psi(3686)\rightarrow\pi^+\pi^-J/\psi$, $J/\psi\rightarrow\gamma a$, $a\rightarrow\gamma\gamma$ in a data sample of $(2.71\pm0.01)\times10^9$ $\psi(3686)$ events collected by BESIII detector. No significant ALP signal is observed over expected background, and upper limits on branching fraction decay a$ ALP-photon coupling constant $g_{a\gamma\gamma}$ are set at 95% confidence level mass range $0.165\leq...
We study the process e^{+}e^{-}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} at twelve center-of-mass energies from 4.6119 to 4.9509 GeV using data samples collected by BESIII detector BEPCII collider. The Born cross sections and effective form factors (|G_{eff}|) are determined with unprecedented precision after combining single double-tag methods based on decay Λ_{c}^{+}→pK^{-}π^{+}. Flat around 4.63 obtained no indication of resonant structure Y(4630), as reported Belle, is found. In addition, oscillatory...
The Born cross sections of the process $e^{+}e^{-}\to D^{*0}D^{*-}\pi^{+}$ at center-of-mass energies from 4.189 to 4.951 GeV are measured for first time. data samples used correspond an integrated luminosity $17.9\,{\rm fb}^{-1}$ and were collected by BESIII detector operating BEPCII storage ring. Three enhancements around 4.20, 4.47 4.67 visible. resonances have masses $4209.6\pm4.7\pm5.9\,{\rm MeV}/c^{2}$, $4469.1\pm26.2\pm3.6\,{\rm MeV}/c^{2}$ $4675.3\pm29.5\pm3.5\,{\rm widths...
We perform a study of the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>χ</a:mi><a:mrow><a:mi>c</a:mi><a:mn>1</a:mn></a:mrow></a:msub><a:mo stretchy="false">(</a:mo><a:mn>3872</a:mn><a:mo stretchy="false">)</a:mo></a:math> line shape using data samples <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"...
Using 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>10087</a:mn><a:mo>±</a:mo><a:mn>44</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: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, which is about 45 times larger than that was previously analyzed, further investigation...
Based on 4.4 fb−1 of e+e− annihilation data collected at the center-of-mass energies between 4.60 and 4.70 GeV with BESIII detector BEPCII collider, pure W-boson-exchange decay Λc+→Ξ0K+ is studied a full angular analysis. The corresponding asymmetry measured for first time to be αΞ0K+=0.01±0.16(stat)±0.03(syst). This result reflects noninterference effect S- P-wave amplitudes. phase shift amplitudes has two solutions, which are δp−δs=−1.55±0.25(stat)±0.05(syst) rad or...
We study the e^{+}e^{-}→γωJ/ψ process using 11.6 fb^{-1} e^{+}e^{-} annihilation data taken at center-of-mass energies from sqrt[s]=4.008 GeV to 4.600 with BESIII detector BEPCII storage ring. The X(3872) resonance is observed for first time in ωJ/ψ system a significance of more than 5σ. relative decay ratio X(3872)→ωJ/ψ and π^{+}π^{-}J/ψ measured be R=1.6_{-0.3}^{+0.4}±0.2, where uncertainty statistical second systematic (the same hereafter). sqrt[s]-dependent cross section...
The cross section of the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\chi}}_{c0}$ is measured at center-of-mass energies from $\sqrt{s}=4.178$ to 4.278 GeV using a data sample $7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with BESIII detector operating BEPCII storage ring. dependence on $\sqrt{s}$ shows resonant structure mass...
From 1310.6×10^{6} J/ψ and 448.1×10^{6} ψ(3686) events collected with the BESIII experiment, we report first observation of Σ^{+} Σ[over ¯]^{-} spin polarization in e^{+}e^{-}→J/ψ[ψ(3686)]→Σ^{+}Σ[over decays. The relative phases form factors ΔΦ have been measured to be (-15.5±0.7±0.5)° (21.7±4.0±0.8)° data, respectively. nonzero value allows for a direct simultaneous measurement decay asymmetry parameters Σ^{+}→pπ^{0}(α_{0}=-0.998±0.037±0.009) ¯]^{-}→p[over ¯]π^{0}(α[over...
The Born cross sections of the $e^{+}e^{-}\to\Sigma^{+}\bar{\Sigma}^{-}$ and $e^{+}e^{-}\to\Sigma^{-}\bar{\Sigma}^{+}$ processes are determined with high precision for center-of-mass energy from 2.3864 to 3.0200 GeV BESIII detector. Nonzero near threshold observed. resulting ratio effective form factors $\Sigma^{+}$ $\Sigma^{-}$ is consistent 3, agreeing incoherent sum squared charges valence quarks, but disagreeing various theoretical predictions. In addition, ratios electric magnetic...
The electromagnetic process $e^{+}e^{-}\to p\bar{p}$ is studied with the initial-state-radiation technique using 7.5 fb$^{-1}$ of data collected by BESIII experiment at seven energy points from 3.773 to 4.600 GeV. Born cross section and effective form factor proton are measured production threshold 3.0 GeV/$c^{2}$ $p\bar{p}$ invariant-mass spectrum. ratio electric magnetic factors determined analysis proton-helicity angular distribution.