A. Dimitrov
- 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
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
- Muon and positron interactions and applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Nuclear reactor physics and engineering
- Gamma-ray bursts and supernovae
- Crystallography and molecular interactions
- Radiation Therapy and Dosimetry
- Atomic and Subatomic Physics Research
- Magnetic Field Sensors Techniques
- CCD and CMOS Imaging Sensors
- Advanced Data Storage Technologies
Sofia University "St. Kliment Ohridski"
2016-2025
University of Antwerp
2023-2024
A. Alikhanyan National Laboratory
2022-2024
Institute of High Energy Physics
2022-2024
European Organization for Nuclear Research
2012-2024
Vrije Universiteit Brussel
2023-2024
Universidad de Los Andes
2012
École Polytechnique Fédérale de Lausanne
2012
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2010-2011
Institute for Nuclear Research and Nuclear Energy
2004
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi;(+)pi(-), and Xi;(+)pi(+) invariant mass spectra proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for existence a narrow Xi(-)pi(-) baryon with 1.862+/-0.002 GeV/c(2) width below detector resolution about 0.018 GeV/c(2). The significance estimated to be above 4.2sigma. This state candidate hypothetical exotic Xi(--)(3/2) S=-2, I=3 / 2, quark content (dsdsū). At same mass, peak observed Xi(-)pi(+)...
Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, 158 A$\cdot$GeV beam energy on a fixed target. Transverse mass spectra rapidity distributions are given for all three energies. The $\Lambda/\pi$ ratio mid-rapidity full phase space shows pronounced maximum between the highest AGS 40 SPS energies, whereas $\bar{\Lambda}/\pi$ exhibits monotonic increase.
Results are presented on event-by-event fluctuations in transverse momentum of charged particles, produced at forward rapidities p+p, C+C, Si+Si and Pb+Pb collisions 158 AGeV. Three different characteristics discussed: the average event, Phi_pT fluctuation measure two-particle correlations. In kinematic region explored, dynamical found to be small. However, a significant system size dependence is observed, with largest value measured peripheral interactions. The data compared predictions...
In view of the High Luminosity upgrade CERN LHC, forward CMS Muon spectrometer will be extended with two new stations improved Resistive Plate Chambers (iRPC) covering pseudorapidity range from 1.8 to 2.4. Compared present RPC system, gap thickness is reduced lower avalanche charge, and an innovative 2D strip readout geometry proposed. These improvements allow iRPC detector cope higher background rates. A Front-End-Board (FEB) designed signals a threshold as low 30 fC integrated Time Digital...
Emission of pi+/-, K+/-, phi, and Lambda was measured in near-central C+C Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S, Pb+Pb, the system-size dependence relative strangeness production nucleus-nucleus is obtained. Its fast rise saturation observed about 60 participating nucleons can be understood as onset formation coherent systems increasing size.
Results are presented on Omega production in central Pb+Pb collisions at 40 and 158 AGeV beam energy. Given transverse-mass spectra, rapidity distributions, total yields for the sum Omega+Antiomega Antiomega separately AGeV. The strongly under-predicted by string-hadronic UrQMD model better agreement with predictions from a hadron gas models.
Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20, 30, 40, 80 and 158 AGeV. The observed close to those expected for a gas of pions correlated by global conservation only. These considerably larger than calculated an ideal deconfined quarks gluons. present measurements do not necessarily exclude reduced from quark-gluon plasma because these might be masked contributions resonance decays.
Electric charge correlations were studied for p+p, C+C, Si+Si, and centrality selected Pb+Pb collisions at $\sqrt{{s}_{\mathrm{NN}}}=17.2$ GeV with the NA49 large acceptance detector CERN SPS. In particular, long-range pseudorapidity of oppositely charged particles measured using balance function method. The width decreases increasing system size reactions. This decrease could be related to an delay hadronization in central collisions.
The CMS experiment, located at the Large Hadron Collider (LHC) in CERN, has a redundant muon system composed by three different gaseous detector technologies: Cathode Strip Chambers (in forward regions), Drift Tubes central region), and Resistive Plate (both its regions). All are used for reconstruction triggering. RPC confers robustness redundancy to trigger. operation challenging background pileup conditions of LHC environment is presented. provides information all track finders thus...