R. Piandani
A5004782155- 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
- Neutrino Physics Research
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Stochastic processes and statistical mechanics
- Superconducting Materials and Applications
- Advanced NMR Techniques and Applications
- Cosmology and Gravitation Theories
- Opportunistic and Delay-Tolerant Networks
- Parallel Computing and Optimization Techniques
- Particle accelerators and beam dynamics
- Nuclear physics research studies
- Engineering and Test Systems
- International Science and Diplomacy
University of Chinese Academy of Sciences
2022-2024
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2017-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2013-2024
Scuola Superiore Meridionale
2024
Roma Tre University
2024
Autonomous University of San Luis Potosí
2023-2024
Centre National de la Recherche Scientifique
2023-2024
European Organization for Nuclear Research
2024
Aix-Marseille Université
2023-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2008-2023
A bstract The NA62 experiment reports the branching ratio measurement $$ \mathrm{BR}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({10.6}_{-3.4}^{+4.0}\left|{}_{\mathrm{stat}}\right.\pm {0.9}_{\mathrm{syst}}\right)\times {10}^{-11} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>BR</mml:mi> <mml:mfenced> <mml:mrow> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>π</mml:mi> <mml:mi>ν</mml:mi> <mml:mover> <mml:mo>¯</mml:mo>...
A precision measurement of the ratio RK rates kaon leptonic decays K±→e±ν and K±→μ±ν with full data sample collected by NA62 experiment at CERN in 2007–2008 is reported. The result, obtained analysing ∼150000 reconstructed candidates 11% background contamination, RK=(2.488±0.010)×10−5, agreement Standard Model expectation.
A search for heavy neutral lepton production in $K^+$ decays using a data sample collected with minimum bias trigger by the NA62 experiment at CERN 2015 is reported. Upper limits $10^{-7}$ to $10^{-6}$ level are established on elements of extended neutrino mixing matrix $|U_{\ell 4}|^2$ ($\ell=e,\mu$) mass range $170-448~{\rm MeV}/c^2$. This improves results from previous searches decays, setting more stringent and extending range.
A search for heavy neutral lepton (N) production in K+→e+N decays using the data sample collected by NA62 experiment at CERN 2017–2018 is reported. Upper limits of extended neutrino mixing matrix element |Ue4|2 are established level 10−9 over most accessible mass range 144–462 MeV/c2, with assumption that lifetime exceeds 50 ns. These improve significantly upon those previous and decay searches. The favoured Big Bang Nucleosynthesis excluded up to a about 340 MeV/c2.
The NA62 experiment at CERN reports searches for $K^+\to\mu^+N$ and $K^+\to\mu^+\nu X$ decays, where $N$ $X$ are massive invisible particles, using the 2016-2018 data set. particle is assumed to be a heavy neutral lepton, results expressed as upper limits of ${\cal O}(10^{-8})$ neutrino mixing parameter $|U_{\mu4}|^2$ masses in range 200-384 MeV/$c^2$ lifetime exceeding 50 ns. considered scalar or vector hidden sector mediator decaying an final state, decay branching fraction 10-370 reported...
The NA62 experiment at the CERN SPS reports first search for $K^+ \rightarrow \pi^+ \nu \bar{\nu}$ using decay-in-flight technique, based on a sample of $1.21\times10^{11}$ $K^+$ decays collected in 2016. single event sensitivity is $3.15\times 10^{-10}$, corresponding to 0.267 Standard Model events. One signal candidate observed while expected background 0.152 This leads an upper limit $14 \times 10^{-10}$ branching ratio 95\% CL.
The results of a search for $\pi^0$ decays to photon and an invisible massive dark at the NA62 experiment CERN SPS are reported. From total $4.12\times10^8$ tagged mesons, no signal is observed. Assuming kinetic-mixing interaction, limits set on coupling ordinary as function mass, improving previous searches in mass range 60--110 MeV/$c^2$. present interpreted terms upper limit branching ratio electro-weak decay $\pi^0 \to \gamma \nu \overline{\nu}$, current by more than three orders magnitude.
A bstract The NA62 experiment at the CERN SPS reports a study of sample 4 × 10 9 tagged π 0 mesons from K + → ( γ ), searching for decay to invisible particles. No signal is observed in excess expected background fluctuations. An upper limit . − set on branching ratio 90% confidence level, improving previous results by factor 60. This result can also be interpreted as model- independent X , where particle escaping detection with mass range 0.110–0.155 GeV /c 2 and rest lifetime greater than...
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.
A study of the dynamics rare decay K±→π±γγ has been performed on a sample 232 candidates, with an estimated background 17.4±1.1 events, collected by NA62 experiment at CERN in 2007. The results are combined those from measurement conducted NA48/2 Collaboration CERN. model-independent branching ratio kinematic range z=(mγγ/mK)2>0.2 is BMI(z>0.2)=(0.965±0.063)×10−6, and full assuming Chiral Perturbation Theory description B(Kπγγ)=(1.003±0.056)×10−6. detailed comparison previous measurements performed.
A bstract search for the K + → π X decay, where is a long-lived feebly interacting particle, performed through an interpretation of $$ {\pi}^{+}\nu \overline{\nu} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>ν</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> analysis data collected in 2017 by NA62 experiment at CERN. Two ranges masses, 0–110 MeV /c 2 and 154–260 , lifetimes above 100 ps are...
The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using data sample collected in 2017. No signals are observed, upper limits on branching fractions of these 2.2×10−10 4.2×10−11 obtained, respectively, 90% confidence level. These improve previously reported measurements by factors 3 2, respectively.
A bstract The NA62 experiment reports an investigation of the $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>π</mml:mi> <mml:mi>ν</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> mode from a sample K + decays collected in 2017 at CERN SPS. has achieved single event sensitivity (0 . 389 ± 0 024) × 10 − , corresponding to 2.2 events...
Searches for lepton number violating K+→π−e+e+ and K+→π−π0e+e+ decays have been performed using the complete dataset collected by NA62 experiment at CERN in 2016–2018. Upper limits of 5.3×10−11 8.5×10−10 are obtained on decay branching fractions 90% confidence level. The former result improves a factor four over previous best limit, while latter represents first limit rate.
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 precision test of lepton flavour universality has been performed by measuring the ratio RK kaon leptonic decay rates K+ --> e+nu and mu+nu in a sample 59813 reconstructed candidates with (8.71 +- 0.24)% background contamination. The result = (2.487 0.013) * 10^{-5} is agreement Standard Model expectation.
The NA62 experiment recorded a large sample of $K^+ \rightarrow μ^+ ν_μ$ decays in 2007. A peak search has been performed the reconstructed missing mass spectrum. In absence signal, limits range $2 \times 10^{-6}$ to $10^{-5}$ have set on squared mixing matrix element $|U_{\mu4} |^2$ between muon and heavy neutrino states, for masses 300-375 MeV/$c^2$. result extends which upper value previous production experiments.
The NA62 experiment collected a large sample of charged kaon decays in 2007 with highly efficient trigger for into electrons. A measurement the $\pi^0$ electromagnetic transition form factor slope parameter from $1.11\times10^{6}$ fully reconstructed $K^\pm \to \pi^\pm \pi^0_D, \pi^0_D e^+ e^-\gamma$ events is reported. measured value $a = (3.68 \pm 0.57)\times10^{-2}$ good agreement theoretical expectations and previous measurements, represents most precise experimental determination...
The main goal of the NA62 experiment at CERN is to measure branching ratio ultra-rare K + → π ν decay, collecting about 100 events test Standard Model Particle Physics.Readout uniformity sub-detectors, scalability, efficient online selection and lossless high rate readout are key issues.The TDCB TEL62 boards common blocks TDAQ system.TDCBs hit times from TEL62s process store them in a buffer, extracting only those requested by trigger system following matching primitives produced inside...
A sample of $2.8 \times 10^4$ $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ candidates with negligible background was collected by the NA62 experiment at CERN SPS in 2017--2018. The model-independent branching fraction is measured to be $(9.15 \pm 0.08)\times 10^{-8}$, a factor three more precise than previous measurements. decay form presented as function squared dimuon mass. measurement parameters and their uncertainties performed using description based on Chiral Perturbation Theory $\mathcal{O}(p^6)$.
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 sample of 1.69 × 107 fully reconstructed π0 → γe+e− in the kinematic range mee > 10MeV/c2 with a negligible background contamination collected by NA48/2 experiment at CERN 2003-04 is analysed to search for dark photon (A′) via decay chain π;0 γA′, A′ e+e. No signal observed, and preliminary exclusion limits on space mass mA′ mixing parameter ϵ2 are reported.