A5114375597- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Computational Physics and Python Applications
- Earth Systems and Cosmic Evolution
- Atomic and Molecular Physics
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- International Science and Diplomacy
- Nuclear Physics and Applications
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Advanced Data Processing Techniques
- Quantum, superfluid, helium dynamics
- Experimental and Theoretical Physics Studies
ETH Zurich
2016-2025
Board of the Swiss Federal Institutes of Technology
1994-2023
Centre National de la Recherche Scientifique
2008-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2023
Duke University
2021-2023
University of California, Irvine
2013-2023
Universidad Autónoma de Madrid
2023
University of Bern
2023
Albert Einstein College of Medicine
2023
Colorado State University
2021-2023
A search for sub-GeV dark matter production mediated by a new vector boson A^{'}, called photon, is performed the NA64 experiment in missing energy events from 100 GeV electron interactions an active beam dump at CERN SPS. From analysis of data collected years 2016, 2017, and 2018 with 2.84×10^{11} electrons on target no evidence such process has been found. The most stringent constraints A^{'} mixing strength photons parameter space scalar fermionic mass range ≲0.2 are derived, thus...
We report on a direct search for sub-GeV dark photons (${A}^{\ensuremath{'}}$), which might be produced in the reaction ${e}^{\ensuremath{-}}Z\ensuremath{\rightarrow}{e}^{\ensuremath{-}}Z{A}^{\ensuremath{'}}$ via kinetic mixing with by 100 GeV electrons incident an active target NA64 experiment at CERN SPS. The would decay invisibly into matter particles resulting events large missing energy. No evidence such decays was found $2.75\ifmmode\times\else\texttimes\fi{}1{0}^{9}$ target. set new...
A search is performed for a new sub-GeV vector boson (${A}^{\ensuremath{'}}$) mediated production of dark matter ($\ensuremath{\chi}$) in the fixed-target experiment, NA64, at CERN SPS. The ${A}^{\ensuremath{'}}$, called photon, can be generated reaction ${e}^{\ensuremath{-}}Z\ensuremath{\rightarrow}{e}^{\ensuremath{-}}Z{A}^{\ensuremath{'}}$ 100 GeV electrons dumped against an active target followed by its prompt invisible decay...
We report the first results on a direct search for new 16.7 MeV boson (X) which could explain anomalous excess of e^{+}e^{-} pairs observed in excited ^{8}Be^{*} nucleus decays. Because its coupling to electrons, X be produced bremsstrahlung reaction e^{-}Z→e^{-}ZX by 100 GeV e^{-} beam incident an active target NA64 experiment at CERN Super Proton Synchrotron and through subsequent decay into pair. With 5.4×10^{10} electrons target, no evidence such decays was found, allowing us set limits...
The improved results on a direct search for new X(16.7 MeV) boson which could explain the anomalous excess of $e^+e^-$ pairs observed in excited 8Be nucleus decays ("Berillium anomaly") are reported. Due to its coupling electrons, X be produced bremsstrahlung reaction e-Z -> e-ZX by high-energy beam electrons incident active target NA64 experiment at CERN SPS and through subsequent decay into pair. No evidence such was found from combined analysis data samples with total statistics...
We carried out a model-independent search for light scalar ($s$) and pseudoscalar axionlike ($a$) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced through Primakoff effect in interactions of hard bremsstrahlung generated 100 GeV electrons NA64 active dump with virtual provided nuclei dump. $a(s)$ would penetrate downstream HCAL module, serving as shield, observed either their...
The results of a new search for positronium decays into invisible final states are reported. Convincing detection this decay mode would be strong evidence physics beyond the standard model (SM): example, existence extra--dimensions, milli-charged particles, light gauge bosons or mirror particles. Mirror matter could relevant dark candidate. In paper setup and experiment presented. collected sample about $(6.31\ifmmode\pm\else\textpm\fi{}0.28)\ifmmode\times\else\texttimes\fi{}{10}^{6}$...
This document reports on a series of experimental and theoretical studies conducted to assess the astro-particle physics potential three future large-scale particle detectors proposed in Europe as next generation underground observatories. The apparatus employ different and, some extent, complementary detection techniques: GLACIER (liquid Argon TPC), LENA scintillator) MEMPHYS (\WC), based use large mass liquids active media. results these are presented along with critical discussion...
In this paper, we present measurements of the ortho-positronium emission energy in vacuum from mesoporous films using time flight technique. We show evidence quantum mechanical confinement mesopores that defines minimal emitted Ps. Two samples with different effective pore sizes, measured positron annihilation lifetime spectroscopy, are compared for data collected temperature range 50-400 K. The sample smaller size exhibits a higher ($73\pm$5 meV), to bigger pores ($48\pm$5 due stronger...
The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson ${A}^{\ensuremath{'}}$ were set by NA64 experiment mass region ${m}_{{A}^{\ensuremath{'}}}\ensuremath{\lesssim}250\text{ }\text{ }\mathrm{MeV}$, analyzing data from interaction $2.84\ifmmode\times\else\texttimes\fi{}{10}^{11}$ 100-GeV electrons with an active thick target and searching missing-energy events. In this work, including production secondary...
The first results of the study high-energy electron neutrino (ν_{e}) and muon (ν_{μ}) charged-current interactions in FASERν emulsion-tungsten detector FASER experiment at LHC are presented. A 128.8 kg subset volume was analyzed after exposure to 9.5 fb^{-1} sqrt[s]=13.6 TeV pp data. Four (eight) ν_{e} interaction candidate events observed with a statistical significance 5.2σ (5.7σ). This is direct observation particle collider includes highest-energy ν_{μ} ever detected from an artificial...
The current focus of the CERN program is Large Hadron Collider (LHC), however, engaged in long baseline neutrino physics with CNGS project and supports T2K as recognized RE13, for good reasons: a number observed phenomena high-energy cosmology lack their resolution within Standard Model particle physics; these puzzles include origin masses, CP-violation leptonic sector, baryon asymmetry Universe. They will only partially be addressed at LHC. A positive measurement sin2 2θ13 > 0.01 would...
The reemission yield of ortho-positronium (o-Ps) into vacuum outside mesoporous silica films on glass is measured in reflection mode with a specially designed lifetime (LT) spectrometer. Values as high 40% are found. intensity the 142ns LT recorded function depth. depth profiling correlated to 2γ and 3γ energy ones determine annihilation characteristics inside films. Positron capped used pore size. For first time, set consistent fingerprints for positronium annihilation, o-Ps vacuum, size,...
Measurements of multiplicity and transverse momentum fluctuations charged particles were performed in inelastic p+p interactions at 20, 31, 40, 80, 158 $$\text{ GeV }\!/\!c$$ beam momentum. Results for the scaled variance distribution three strongly intensive measures $$\varDelta [P_{T},N]$$ , $$\varSigma $$\varPhi _{p_T}$$ are presented. For first time results on fully corrected experimental biases. The significantly deviate from expectations independent particle production. They also...
A search for a new Z^{'} gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out first time using missing-energy technique NA64 experiment at CERN SPS. From analysis of data 3.22×10^{11} electrons on target collected during 2016-2021 runs, no signal events were found. This allows us to derive constraints Z^{'}-e coupling strength, which, 0.3≲m_{Z^{'}}≲100 MeV, are more stringent compared those obtained from neutrino-electron scattering data.
The Forward Search Experiment (FASER) at CERN’s Large Hadron Collider (LHC) has recently directly detected the first collider neutrinos. Neutrinos play an important role in all FASER analyses, either as signal or background, and it is therefore essential to understand neutrino event rates. In this study, we update previous simulations present prescriptions for theoretical predictions of fluxes cross sections, together with their associated uncertainties. With these results, discuss potential...
Plastic scintillators, segmented into small, optically isolated voxels, are used for detecting elementary particles and provide reliable particle identification with nanosecond time resolution. Building large detectors requires the production precise alignment of millions individual units, a process that is time-consuming, cost-intensive, difficult to scale. Here, we introduce an additive manufacturing chain capable producing plastic-based scintillator as single, monolithic structure. Unlike...
A liquid argon TPC (ICARUS-like) has the ability to detect clean neutrino bursts from type-II supernova collapses. In this paper, we consider for first time four possible detectable channels, namely, elastic scattering on electrons all species, νe charged current absorption Ar with production of excited K, e Cl and neutral interactions flavours. We compute total rates energy spectra events including effects three-flavour oscillation matter in propagation supernova. Results show a dramatic...