N. Manthos
- 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
- Computational Physics and Python Applications
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Advanced X-ray and CT Imaging
- CCD and CMOS Imaging Sensors
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Gamma-ray bursts and supernovae
- Nuclear physics research studies
- Digital Radiography and Breast Imaging
- advanced mathematical theories
- Superconducting Materials and Applications
- Scientific Computing and Data Management
University of Ioannina
2016-2025
Institute of High Energy Physics
2015-2024
University of Antwerp
2024
A. Alikhanyan National Laboratory
2014-2024
Saha Institute of Nuclear Physics
2021-2023
University of Delhi
2022-2023
Eötvös Loránd University
2023
Bhabha Atomic Research Centre
2019-2021
Joint Institute for Nuclear Research
2016
European Organization for Nuclear Research
1986-2014
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 CP violation parameter η+− is determined through the eigentime-dependent asymmetry in rates of initially tagged K0 and decaying to π+π−. obtained values are |η+−| = (2.312 ± 0.043stat. 0.030syst. 0.011τs) × 10−3 Φ+− 42.7° 0.9stat.° 0.6syst.° 0.9Δm° with Δ (527.4 2.9) 107h̵gs−1 measured same experiment using semileptonic decay channel.