S. Vlachos
- 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
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- advanced mathematical theories
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Advanced Measurement and Metrology Techniques
- Stochastic processes and statistical mechanics
National Technical University of Athens
2014-2023
European Organization for Nuclear Research
2003-2019
The University of Adelaide
2013-2019
Ludwig-Maximilians-Universität München
2011-2019
The University of Texas at Arlington
2015-2019
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2014-2016
Budker Institute of Nuclear Physics
2016
Siberian Branch of the Russian Academy of Sciences
2016
Universidad de Granada
2009-2016
Universidade Federal do Rio de Janeiro
2015
The goal of the DIRAC experiment at CERN (PS212) is to measure $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield precision 5% on value $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based part collected data we present first result lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss major systematic errors. This corresponds $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.
We use fits to recent published CPLEAR data on neutral kaon decays $π^+π^-$ and $πeν$ constrain the CPT--violation parameters appearing in a formulation of system as an open quantum-mechanical system. The obtained upper limits are approaching range suggested by certain ideas concerning quantum gravity.
The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and significantly improved the precision on its lifetime determination. From sample 21227 atomic pairs, 4% measurement S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ been attained, providing an important test Chiral Perturbation Theory.
The goal of the DIRAC experiment at CERN is to measure with high precision lifetime π + -atom (A 2π ), which order 3×10 -15 s, and thus determine s-wave ππ-scattering lengths difference |a 0 -a 2 |.A atoms are detected through characteristic features -pairs from atom break-up (ionization) in target.We report on a first statistics atomic data sample obtained p Ni interactions 24 GeV/c proton momentum present methods separate signal background.