A. Antonelli
A5005870576- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Advanced Electrical Measurement Techniques
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Cosmology and Gravitation Theories
- Scientific Measurement and Uncertainty Evaluation
- Medical Imaging Techniques and Applications
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
1995-2024
UCLouvain
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2022
University of Glasgow
2006
A sample of 3984 candidates the K+→π+γγ decay, with an estimated background 291±14 events, was collected by NA62 experiment at CERN during 2017–2018. In order to describe observed di-photon mass spectrum, next-to-leading contribution in chiral perturbation theory found be necessary. The decay branching ratio full kinematic range is measured (9.61±0.17)×10−7. first search for production and prompt axion-like particle gluon coupling process K+→π+a, a→γγ also reported.
The NA62 experiment at CERN SPS is designed to study the $K^+\to\pi^+\nu\bar\nu$ decay. After collecting data in 2016, 2017, and 2018, has resumed taking 2021 received approval for operations until onset of LS3. first search lepton number violating decay $K^+\to\pi^0\pi^-\mu^+ e^+$ flavour decays $K^+\to\pi^0\pi^+\mu^+ e^-$ , $K^+\to\pi^0\pi^+\mu^- reported. More recent results from analyses $K^+\to\pi^+\gamma\gamma$ $\pi^0\to e^+e^-$ are also Additionally, New Physics collected during...
We have studied the phi->a_0(980) gamma process with KLOE detector at Frascati phi-factory DAPhNE by detecting phi->eta pi^0 decays in final states eta->gamma and eta->pi^+ pi^- pi^0. measured branching ratios for both states: Br(phi->eta gamma)=(7.01 +/- 0.10 0.20)x10^-5 (7.12 0.13 0.22)x10^-5 respectively. also extracted a_0(980) mass its couplings to eta pi^0, K^+ K^-, phi meson from fit of invariant distributions using different phenomenological models.
A bstract sample of 1 . 3 × 10 5 K + → π 0 e νγ candidates with less than 1% background was collected by the NA62 experiment at CERN SPS in 2017–2018. Branching fraction measurements are obtained percent relative precision three restricted kinematic regions, improving on existing results a factor larger two. An asymmetry, possibly related to T-violation, is investigated no evidence observed within achieved precision.
A search for the $K^+\to\mu^-\nu e^+e^+$ decay, forbidden within Standard Model by either lepton number or flavour conservation depending on of emitted neutrino, has been performed using dataset collected NA62 experiment at CERN in 2016--2018. An upper limit $8.1\times 10^{-11}$ is obtained decay branching fraction 90% CL, improving a factor 250 over previous search.
A bstract The NA62 experiment at CERN, designed to study the ultra-rare decay K + → π $$ \nu \overline{\nu} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>ν</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> , has also collected data in beam-dump mode. In this configuration, dark photons may be produced by protons dumped on an absorber and reach a volume beginning 80 m downstream. search for decaying flight μ − pairs is reported, based sample of 1 . 4 × 10 17...
We have studied the eta->pi+pi-e+e-(gamma) decay using about 1.7 fb^-1 collected by KLOE experiment at DAFNE phi-factory. This corresponds to 72 millions eta mesons produced in phi radiative decays. measured branching ratio, inclusive of effects, with 4% accuracy: BR(eta->pi+pi-e+e-(gamma)) = (26.8 +/- 0.9_Stat. 0.7_Syst.) x 10^-5. obtained first measurement CP-odd pipi-ee planes angular asymmetry, A_phi (-0.6 2.5_Stat. 1.8_Syst.) 10^-2.
Abstract The NA62 experiment at CERN utilises a differential Cherenkov counter with achromatic ring focus (CEDAR) for tagging kaons within an unseparated monochromatic beam of charged hadrons. CEDAR-H detector was developed to minimise the amount material in path by using hydrogen gas as radiator medium. shown satisfy kaon requirements test-beam before installation and commissioning experiment. performance measured data collected 2023.
The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays flight to electron-positron pairs using a sample of 1.4×10^{17} protons on dump collected 2021. No evidence signal is observed. combined result searches lepton-antilepton final states presented and region the parameter space excluded 90% confidence level, improving previous experimental limits mass values between 50 600 MeV/c^{2} coupling range 10^{-6} 4×10^{-5}. An interpretation e^{+}e^{-} search...
The most precise determinations of V us comes from semileptonic kaon decays.The KLOE experiment at DAΦNE the Frascati φ factory , has measured all experimental inputs to for both neutral and charged kaons.Preliminary results BR(K ± → π 0 e ν) µ ν), τ are presented, together with measurements K L e3 µ3 decay BR, S BR lifetime .From our 5 branching ratios we find =0.2258±0.0022.We have also fully inclusive + µ2 (γ) absolute ratio which obtain µν(γ))=0.6366±0.0017.Combining this value recent...
The NA62 experiment reports the branching ratio measurement $BR(K^+\to\pi^+\nu\bar\nu)$ at 68% CL, based on observation of 20 signal candidates with an expected background 7.0 events from total data sample collected CERN SPS during 2016-2018. This provides evidence for very rare $K^+\to\pi^+\nu\bar\nu$ decay, observed a significance $3.4\sigma$. achieves single event sensitivity $(0.839\pm0.054)\times10^{-11}$, corresponding to 10.0 assuming Standard Model $(8.4\pm1.0)\times10^{-11}$. result...
Searches for heavy neutral leptons $N$ in the $K^+\to e^+N$ and \mu^+N$ decay channels using dataset collected by NA62 experiment at CERN between 2016-2018 are presented. Upper limits on corresponding mixing matrix elements reported level of $\mathcal{O}(10^{-9})$ $\mathcal{O}(10^{-8})$, respectively. This represents an improvement least order magnitude previous measurement, as well extension to higher masses than previously covered. Related searches set upper rate...