A5029091639- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Noncommutative and Quantum Gravity Theories
- Radioactive Decay and Measurement Techniques
- Metaheuristic Optimization Algorithms Research
- Nuclear reactor physics and engineering
- International Science and Diplomacy
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Advanced Numerical Analysis Techniques
- Robotic Path Planning Algorithms
China Aerospace Science and Technology Corporation
2024
Uppsala University
2015-2023
Shanghai Institute of Applied Physics
2000
Chinese Academy of Sciences
2000
The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for light vector mediator this dark force, $\mathrm{U}$ boson, with KLOE detector at DA$\Phi$NE $\mathrm{e}^{+}\mathrm{e}^{-}$ collider. Using an integrated luminosity 1.54 fb$^{-1}$, we studied process $\mathrm{e}^{+}\mathrm{e}^{-} \to \mathrm{U}\gamma$, $\mathrm{U} \mathrm{e}^{+}\mathrm{e}^{-}$, using...
The recent interest in a light gauge boson the framework of an extra U(1) symmetry motivates searches mass range below 1 GeV. We present search for such particle, dark photon, e+e−→Uγ, U→π+π− based on 28 million e+e−→π+π−γ events collected at DAΦNE by KLOE experiment. π+ π− production initial-state radiation compensates loss sensitivity previous U→e+e−, μ+μ− due to small branching ratios ρ–ω resonance region. found no evidence signal and set limit 90% CL mixing strength between photon ε2, U...
A bstract The three precision measurements of the cross section σ ( e + − → π γ(γ)) using initial state radiation by KLOE collaboration provide an important input for prediction hadronic contribution to anomalous magnetic moment muon. These are correlated both statistical and systematic uncertainties and, therefore, simultaneous use these requires covariance matrices that fully describe correlations. We present construction them determine a combined measurement γ(γ)). find, from this...
Using 1.6 fb−1 of e + − → ϕ ηγ data collected with the KLOE detector at DAΦNE, Dalitz plot distribution for η π 0 decay is studied world's largest sample ∼ 4.7 · 106 events. The density parametrized as a polynomial expansion up to cubic terms in normalized dimensionless variables X and Y . experiment sensitive all charge conjugation conserving expansion, including gX 2 term. statistical uncertainty parameters improved by factor two respect earlier measurements.
We searched for the $μ^+μ^-$ decay of a light vector gauge boson, also known as dark photon, in $e^+ e^- \to μ^+ μ^- γ_{\rm ISR}$ process by means Initial State Radiation (ISR) method. used 1.93~fb$^{-1}$ data collected KLOE experiment at DA$Φ$NE $ϕ$-factory. No structures have been observed over irreducible $μ^+ μ^-$ background. A 90\% CL limit on ratio $\varepsilon^2=α^{\prime}/α$ between coupling constant and fine structure $ 3\times 10^{-6}-2\times 10^{-7}$ has set photon mass region 519...
A measurement of the vector to pseudoscalar conversion decay $\phi \to \pi^0 e^+e^-$ with KLOE experiment is presented. sample $\sim 9500$ signal events was selected from a data set 1.7 fb$^{-1}$ $e^+e^-$ collisions at $\sqrt{s} \sim m_{\phi}$ collected DA$\Phi$NE collider. These were used obtain first transition form factor $| F_{\phi \pi^0}(q^2) |$ and new branching ratio decay: $\rm{BR}\,(\phi e^+e^-) = (\,1.35 \pm 0.05^{\,\,+0.05}_{\,\,-0.10}\,) \times 10 ^{-5}$. The result improves...
We searched for evidence of a Higgsstrahlung process in secluded sector, leading to final state with dark photon U and Higgs boson h', the KLOE detector at DAFNE. investigated case h' lighter than U, decaying into muon pair producing missing energy signature. found no set upper limits its parameters range 2m_mu<m_U<1000 MeV, m_h'<m_U.
We have measured the running of effective QED coupling constant $\alpha(s)$ in time-like region $0.6<\sqrt s< 0.975$ GeV with KLOE detector at DA$\Phi$NE using Initial State Radiation process $e^+e^-\to\mu^+ \mu^-\gamma$. It represents first measurement this energy region. Our results show a more than 5$\sigma$ significance hadronic contribution to $\alpha(s)$, which is strongest direct evidence both time- and space-like regions achieved single measurement. By $e^+e^-\to\pi^+\pi^-$ cross...
A bstract Using 1.63 fb −1 of integrated luminosity collected by the KLOE experiment about 7 × 10 4 K S → π ± e ∓ ν decays have been reconstructed. The measured value charge asymmetry for this decay is = (−4.9 5.7 stat 2.6 syst ) −3 , which almost twice more precise than previous result. combination these two measurements gives (−3.8 5.0 and, together with L semileptonic decay, provides significant tests CPT symmetry. obtained results are in agreement invariance.
The three precision measurements of the cross section $σ\big(e^+e^-\rightarrowπ^+π^-γ(γ)\big)$ using initial state radiation by KLOE collaboration provide an important input for prediction hadronic contribution to anomalous magnetic moment muon. These are correlated both statistical and systematic uncertainties and, therefore, simultaneous use these requires covariance matrices that fully describe correlations. We present construction them determine a combined measurement...
Based on a sample of 300 million $K_S$ mesons produced in $\phi \to K_L K_S$ decays recorded by the KLOE experiment at DA$\Phi$NE $e^+e^-$ collider we have measured branching fraction for decay $K_S \pi \mu \nu$. The are identified interaction $K_L$ detector. \nu$ selected boosted decision tree built with kinematic variables and time-of-flight measurement. Signal efficiencies evaluated data control samples $K_L decays. A fit to reconstructed muon mass distribution finds $7223 \pm 180$ signal...
Using $1.6$ fb$^{-1}$ of $e^+ e^-\toϕ\toηγ$ data collected with the KLOE detector at DA$Φ$NE, Dalitz plot distribution for $η\to π^+ π^- π^0$ decay is studied world's largest sample $\sim 4.7 \cdot 10^6$ events. The density parametrized as a polynomial expansion up to cubic terms in normalized dimensionless variables $X$ and $Y$. experiment sensitive all charge conjugation conserving expansion, including $gX^2Y$ term. statistical uncertainty parameters improved by factor two respect earlier...
Based on an integrated luminosity of 1.61 fb$^{-1}$ $e^+e^-$ collision data collected with the KLOE detector at DA$\Phi$NE, Frascati $\phi$-factory, a search for $P$- and $CP$-violating decay $\eta\to\pi^{+}\pi^{-}$ has been performed. Radiative $\phi\to\eta\gamma$ is exploited to access $\eta$ mesons. No signal observed in $\pi^{+}\pi^{-}$ invariant mass spectrum, upper limit branching fraction 90\% confidence level determined be ${\mathcal B}(\eta\to\pi^{+}\pi^{-})<4.9\times10^{-6}$, which...
A bstract The ratio $$ \mathcal{R} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>R</mml:mi> </mml:math> = Γ( K S → πeν ) / π + − has been measured with a sample of 300 million mesons produced in ϕ L decays recorded by the KLOE experiment at DAΦNE e collider. events are selected boosted decision tree built kinematic variables and time-of-flight measurements. Data control samples used to evaluate signal selection efficiencies. With 49647 ± 316 we measure (1 . 0421 0 0066...
Tests of the T, CP and CPT symmetries in neutral kaon system are performed by direct comparison probabilities a transition process to its symmetry-conjugate. The exchange out states required for genuine test involving an antiunitary transformation implied time-reversal is implemented exploiting entanglement K0K‾0 pairs produced at ϕ-factory. A data sample collected KLOE experiment DAΦNE corresponding integrated luminosity about 1.7 fb−1 analysed study Δt distributions ϕ→KSKL→π+π−π±e∓ν...
The quantum interference between the decays of entangled neutral kaons is studied in process $\phi\rightarrow K_S K_L \rightarrow\pi^+\pi^-\pi^+\pi^-$, which exhibits characteristic Einstein--Podolsky--Rosen correlations that prevent both to decay into $\pi^+\pi^-$ at same time. This constitutes a very powerful tool for testing utmost precision coherence kaon pair state, and search tiny decoherence CPT violation effects, may be justified gravity framework. analysed data sample was collected...