P. Valente
A5030678462- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Crystallography and Radiation Phenomena
- Particle accelerators and beam dynamics
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Nuclear materials and radiation effects
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Muon and positron interactions and applications
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Medical Imaging Techniques and Applications
- Magnetic confinement fusion research
- Radiation Therapy and Dosimetry
- Distributed and Parallel Computing Systems
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2015-2025
Roche (Switzerland)
2025
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2010-2024
Roma Tre University
2008-2024
Sofia University "St. Kliment Ohridski"
2022-2024
Hospital de São Sebastião
2024
Centre National de la Recherche Scientifique
2023-2024
Aix-Marseille Université
2023-2024
Institute for Nuclear Research and Nuclear Energy
2022-2023
National Agency for New Technologies, Energy and Sustainable Economic Development
2022-2023
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>...
The electron-positron collider DAPhiNE, the Italian Phi factory, has been recently upgraded in order to implement an innovative collision scheme based on large crossing angle, small beam sizes at point, and compensation of beam-beam interaction by means sextupole pairs creating a "crab-waist" configuration region. Experimental tests novel exhibited increase factor 3 peak luminosity with respect performances reached before upgrade. In this Letter we present new scheme, discuss its advantages,...
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.
Two high-accuracy goniometers equipped with two bent silicon crystals were installed in the betatron cleaning insertion of CERN Large Hadron Collider (LHC) during its long shutdown. First beam tests recently performed at LHC 450 GeV/c and 6500 stored proton beams to investigate feasibility halo collimation assisted by crystals. For first time channeling protons was observed a particle accelerator. A strong reduction losses due nuclear inelastic interactions aligned crystal comparison...
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...
Abstract The workshop “Shedding light on X17” brings together scientists looking for the existence of a possible new particle, often referred to as X17. This hypothetical particle can explain resonant structure observed at $$\sim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> 17 MeV in invariant mass electron-positron pairs, produced after excitation nuclei such $$^8\hbox {Be}$$ <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>8</mml:mn> </mml:msup>...
The volume reflection phenomenon was detected while investigating 400 GeV proton interactions with bent silicon crystals in the external beam H8 of CERN Super Proton Synchrotron. Such a process observed for wide interval crystal orientations relative to axis, and its efficiency exceeds 95%, thereby surpassing any previously value. These observations suggest new perspectives manipulation high-energy beams, e.g., collimation extraction new-generation hadron colliders, such as Large Hadron...
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.
High-energy positron annihilation is a viable mechanism to produce dark photons (${A}^{\ensuremath{'}}$). This reaction plays significant role in beam-dump experiments using multi-GeV electron beams on thick targets by enhancing the sensitivity ${A}^{\ensuremath{'}}$ production. The positrons produced electromagnetic shower can an via nonresonant (${e}^{+}+{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}+{A}^{\ensuremath{'}}$) and resonant...
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...
For the first time at Beam Test Facility (BTF) of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>DA</a:mi><a:mi mathvariant="normal">Φ</a:mi><a:mi>NE</a:mi></a:mrow></a:math> accelerator complex Laboratori Nazionali di Frascati INFN, 450 MeV positrons have been deflected with high efficiency, using planar channeling process in a bent silicon crystal. The deflection angle obtained is beyond 1 mrad. This interesting result finds several applications for...