U. Gastaldi
A5079223423- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Advanced Chemical Physics Studies
- Muon and positron interactions and applications
- Neutrino Physics Research
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Therapy and Dosimetry
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Inorganic Fluorides and Related Compounds
École Polytechnique
2023
Centre National de la Recherche Scientifique
2015-2023
Laboratoire Leprince-Ringuet
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2014-2020
European Organization for Nuclear Research
1985-2015
AGH University of Krakow
2015
Clermont Université
2015
Centro Brasileiro de Pesquisas Físicas
2015
Université Clermont Auvergne
2015
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2004-2014
We report the experimental observation of a light polarization rotation in vacuum presence transverse magnetic field. Assuming that data distribution is Gaussian, average measured (3.9 +/- 0.5) x 10(-12) rad/pass, at 5 T with 44 000 passes through 1 m long magnet, lambda = 1064 nm. The relevance this result terms existence light, neutral, spin-zero particle discussed.
Vacuum magnetic birefringence was predicted long time ago and is still lacking a direct experimental confirmation. Several efforts are striving to reach this goal, the sequence of results promises success in next few years. This measurement generally accompanied by search for hypothetical light particles that couple two photons. The PVLAS experiment employs sensitive polarimeter based on high finesse Fabry–Perot cavity. In paper we report latest experiment. data analysed taking into account...
In 2006 the PVLAS collaboration reported observation of an optical rotation generated in vacuum by a magnetic field. To further check against possible instrumental artifacts, several upgrades to apparatus have been made during past year. Two data taking runs, at wavelength 1064 nm, performed new configuration with field strengths 2.3 and 5 T. The T value was chosen order avoid stray fields. observations do not show presence signal down levels...
This paper describes the 25 year effort to measure vacuum magnetic birefringence and dichroism with PVLAS experiment. The experiment went through two main phases: first using a rotating superconducting magnet second permanent magnets. was not able reach predicted value from QED. Nonetheless has set current best limits on for field of Bext=2.5 T, namely, Δn(PVLAS)=(12±17)×10−23 |Δκ|(PVLAS)=(10±28)×10−23. uncertainty Δn(PVLAS) is about factor 7 above Δn(QED)=2.5×10−23 @ 2.5 T.
Several groups are carrying out experiments to observe and measure vacuum magnetic birefringence, predicted by quantum electrodynamics (QED). We have started running the new PVLAS apparatus installed in Ferrara, Italy, measured a noise floor value for unitary field birefringence of $\mathrm{\ensuremath{\Delta}}{n}_{u}^{(\mathrm{vac})}=(4\ifmmode\pm\else\textpm\fi{}20)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}23}\text{ }\text{ }{\mathrm{T}}^{\ensuremath{-}2}$ (the error represents...
We describe the principle and status of PVLAS experiment which is presently running at INFN section Ferrara, Italy, to detect magnetic birefringence vacuum. This related QED vacuum structure can be detected by measuring ellipticity acquired a linearly polarized light beam propagating through strong field. Such an effect predicted Euler-Heisenberg Lagrangian. The method also sensitive other hypothetical physical effects such as axion-like particles in general any fermion/boson millicharged...
The PVLAS collaboration is presently assembling a new apparatus (at the INFN section of Ferrara, Italy) to detect vacuum magnetic birefringence (VMB). VMB related structure QED and predicted by Euler-Heisenberg-Weisskopf effective Lagrangian. It can be detected measuring ellipticity acquired linearly polarised light beam propagating through strong field. Using very same optical technique it also possible search for hypothetical low-mass particles interacting with two photons, such as...
Experimental bounds on induced vacuum magnetic birefringence can be used to improve present photon-photon scattering limits in the electronvolt energy range. Measurements with Polarizzazione del Vuoto con Laser apparatus [E. Zavattini et al., Phys. Rev. D 77, 032006 (2008)] at both $\ensuremath{\lambda}=1064$ and 532 nm lead parameter ${A}_{e}$, describing nonlinear effects QED, of ${A}_{e}^{(1064)}<6.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}21}\text{ }\text{...
We report on the resonant Fabry Perot cavity of PVLAS (Polarization Vacuum with LASer) experiment operating at λ = 1064 nm a record decay time 2.7 ms, factor more than two larger any previously reported optical resonator. This corresponds to coherence length 8.1 · 10(5) m. The is 3.303 m, and resulting finesse 770,000.
We describe the principle and status of PVLAS experiment which is being assembled at INFN Laboratori Nazionali di Legnaro (Legnaro, Padua, Italy) to look for coherent effects, related QED vacuum structure, on propagation a polarized light beam in strong magnetic field.