Á. Salamon
A5058477941- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Muon and positron interactions and applications
- Advanced Data Storage Technologies
- Parallel Computing and Optimization Techniques
- Photonic and Optical Devices
- Optical Network Technologies
- Medical Imaging Techniques and Applications
- advanced mathematical theories
- Interconnection Networks and Systems
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Advanced Photonic Communication Systems
- Scientific Computing and Data Management
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2015-2024
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2024
Roma Tre University
2024
UCLouvain
2022-2023
University of Rome Tor Vergata
2007-2020
Joint Institute for Nuclear Research
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2016-2018
University of Pisa
2018
Johannes Gutenberg University Mainz
2017
Institute of Particle Physics
2017
The performance of the LHCb Muon system and its stability across full 2010 data taking with LHC running at ps = 7 TeV energy is studied. optimization detector setting time calibration performed first collisions delivered by described. Particle rates, measured for wide range luminosities beam operation conditions experienced during run, are compared values expected from simulation. space alignment detectors, chamber efficiency, resolution cluster size evaluated. found to be as specifications...
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>...
We present a model for spike-driven dynamics of plastic synapse, suited VLSI implementation. The synaptic device behaves as capacitor on short timescales and preserves the memory two stable states (efficacies) long timescales. transitions (LTP/LTD) are stochastic because both number distribution neural spikes in any finite (stimulation) interval fluctuate, even at fixed pre- postsynaptic spike rates. single synapse is studied analytically by extending solution to classic problem queuing...
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...
Single-photon sources are important for integrated photonics and quantum technologies, can be used in key distribution, computing, sensing. Color centers the solid state a promising candidate development of next generation single-photon devices. They point defects crystal lattice that absorb emit light at given wavelengths single photons with high efficiency. The landscape color has changed abruptly recent years, identification wider set emergence new solid-state platforms room-temperature...
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...
We report transmission of nine 25-Gb/s return-to-zero differential quadrature phase-shift keyed (RZ-DQPSK) dense wavelength-division-multiplexing signals with 25-GHz channel spacing over 1000 km single-mode fiber (SMF-28) in a recirculating loop. The loop uses all erbium-doped amplifiers (EDFAs) and has an amplifier 100 average loss 25 dB between EDFAs maximum span up to 30 dB. All channels were copolarized launched. No precompensation or postcompensation was employed. To the best our...
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...
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.
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 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 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...
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 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...