A5052804241- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Scientific Research and Discoveries
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Electromagnetic Scattering and Analysis
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Superconducting Materials and Applications
- Quantum chaos and dynamical systems
- Black Holes and Theoretical Physics
- Radioactive contamination and transfer
- Quantum and Classical Electrodynamics
- Dark Matter and Cosmic Phenomena
- Dental Radiography and Imaging
- Electron Spin Resonance Studies
- Electromagnetic Fields and Biological Effects
- Radiation Detection and Scintillator Technologies
- Distributed Sensor Networks and Detection Algorithms
- Electromagnetic Simulation and Numerical Methods
- Bryophyte Studies and Records
- Microstructure and Mechanical Properties of Steels
Institute for Medical Research and Occupational Health
2022-2024
Rudjer Boskovic Institute
2004-2017
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2006
Sapienza University of Rome
2004
University of Zagreb
2003
We show that a slightly modified Breit-Wigner formula can successfully describe the total cross section even for broad resonances, from light ρ(770) to heavy Z boson. In addition mass, width, and branching fraction, we include another resonance parameter turns out be directly related pole residue phase. The new has two mathematically equivalent forms: one with other parameters.
In spite of long-lasting discussions, the agreement on existence $N(1710)$ ${P}_{11}$ resonance has not yet been reached, so Particle Data Group declares it as a 3-star only. We show that proper inclusion inelastic channels in coupled-channel formalism indisputably demands state, and presumably stays hidden within continuum ambiguity typical single-channel partial-wave analysis. Consequently, confidence rating this state should be raised to 4-star resonance.
The Zagreb analysis partial-wave $T$ matrices included in the Review of Particle Physics [by Data Group (PDG)] contain Breit-Wigner parameters only. As advantages pole over quantifying scattering matrix resonant states are becoming indisputable, we supplement original solution with parameters. Because an already reported numeric error $S$${}_{11}$ analytic continuation [Batini\ifmmode \acute{c}\else \'{c}\fi{} et al., Phys. Rev. C 57, 1004(E) (1997); arXiv:nucl-th/9703023], declare old...
OPERA is part of the CNGS project and it an experiment dedicated to observation long-baseline nu <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mu</sub> into xmlns:xlink="http://www.w3.org/1999/xlink">tau</sub> oscillations through tau appearance. Resistive Plate Chambers (RPCs) with bakelite electrodes are used instrument 2 cm gaps between magnetized iron slabs two spectrometers. The RPC installation ended in may 2004 on first spectrometer...
A model-independent method for the determination of resonance parameters as K-matrix pole from a T matrix is presented. The based on eliminating dependence choice channel basis by analyzing trace K and matrices in coupled-channel formalism, rather than individual elements multichannel scattering matrix.
Within the framework of a mathematically well-defined coupled-channel T-matrix model we have improved existing multichannel pole-extraction procedure based on numerical analytic continuation channel propagator, and for first time present full set pole parameters already published amplitudes. Standard single-channel method (speed plot) was then applied to those amplitudes resulting sets poles were inspected. The anomaly has been established that in some partial waves values extracted using...
All resonances, from hydrogen nuclei excited by the high-energy gamma rays in deep space to newly discovered particles produced Large Hadron Collider, should be described same fundamental physical quantities. However, two distinct sets of properties are used describe resonances: pole parameters (complex position and residue) Breit-Wigner (mass, width, branching fractions). There is an ongoing decades-old debate on which them abandoned. In this study nucleon resonances emerging elastic...
Abstract The invasion of Ukraine and military operations around Ukrainian nuclear power plants other facilities have prompted us to search for radiocaesium in mosses from the Kopački Rit Nature Park Croatia, since are known bioindicators airborne radioactive pollution, is a low background area. Sampling was finished August 2023, our analysis found no elevated levels. therefore remains suitable place future detection anthropogenic pollutants.
Due to the consequences of nuclear and/or radiological accidents in past (Chernobyl, Fukushima, etc.), and potential future events that kind, constant monitoring environmental radioactivity is important. There are different pathways transfer radionuclides from environment humans (ingestion, inhalation external). Food ingestion greatly contributes total effective dose; hence, it great importance investigate exposure through food. This paper presents results a long-term investigation 137Cs...
Contrary to very early beliefs, the experimental cross section data for eta production in proton-proton scattering are well described if pi and only meson exchange diagrams used calculate Born term. The inclusion of initial final state interactions is done factorization approximation by using inverse square Jost function. two body functions obtained from S matrices low energy effective range approximation. danger double counting p-eta interaction discussed. It shown that higher partial waves...
Eta meson production in the proton-proton scattering is dominated by low-mass exchange. We present a brief study on how type of exchanged mesons within coupled-channel and multi-resonance model influences observables. show under which circumstances eta exchange may explain shape observed cross sections, few selected results: total section full energy range, distribution at 15.5 MeV.
The broad non-strange meson $f_0$(500) is considered to be a non-Breit-Wigner resonance. It generally assumed that if resonance it can hardly described by Breit-Wigner form. We show here not true neither for the Z boson, nor much narrower $\Delta(1232)$, and explain why fits with them perfectly. Key differences between boil down single parameter: angle at which we see pole from threshold, explains background, residue phase, difference parameters.
Single channel, single energy partial wave analyses (SE_PWA) are from the first principles non-unique in inelastic region if only data elastic channels used, so we details discuss mechanisms how problem is eliminated pion-nucleon scattering. The "continuum ambiguities" puzzle has been extensively discussed since early 1970es, and two major for solving have suggested: either to ensure continuity of Argand diagrams by imposing T-matrix t-channel analyticity (Karlsruhe-Helsinki, VPI/GWU) or...
In the course of devising a simple method for extraction S-matrix poles from data, an additional fundamental resonance property emerged. It is reaction invariant quantity, and since it directly related to Breit-Wigner parameters, we call phase beta. We propose that this beta added in resonant data tables.