P. Bydžovský
A5032505696- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Magnetic confinement fusion research
- Atomic and Molecular Physics
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Solid-state spectroscopy and crystallography
- Particle Detector Development and Performance
- Advanced Chemical Physics Studies
- Pulsars and Gravitational Waves Research
- Medical Imaging Techniques and Applications
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear reactor physics and engineering
- Neutrino Physics Research
Czech Academy of Sciences, Nuclear Physics Institute
2015-2024
Institute of Nuclear Physics
1991-2024
University of Coimbra
2016
Czech Academy of Sciences
2007-2015
Nuclear Research Institute Rez (Czechia)
2009-2013
Tohoku University
2011
Gifu University
2011
Akita University
2011
National Institute of Technology, Ichinoseki College
2011
High Energy Accelerator Research Organization
2011
An experiment measuring electroproduction of hypernuclei has been performed in hall A at Jefferson Lab on a 12C target. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets ring imaging Cherenkov detector were added the standard equipment. unprecedented energy resolution less than 700 keV FWHM achieved. Thus, observed (Lambda)(12)B spectrum shows for first time identifiable strength core-excited region between ground-state s-wave...
Kaon photoproduction on the proton is studied in resonance region using an isobar model. The higher-spin nucleon (3/2 and 5/2) hyperon (3/2) resonances were included model utilizing consistent formalism by Pascalutsa, they found to play important role data description. spin-1/2 spin-3/2 combination with Born terms contribute significantly background part of amplitude. Various forms hadron form factor considered construction, dipole multidipole selected as those most suitable for Model...
An experimental study of the (16)O(e,e'K(+))(Lambda)(16)N reaction has been performed at Jefferson Lab. A thin film falling water was used as a target. This permitted simultaneous measurement p(e,e'K(+))Lambda, Sigma(0) exclusive reactions and precise calibration energy scale. ground-state binding 13.76+/-0.16 MeV obtained for (Lambda)(16)N with better precision than previous measurements on mirror hypernucleus (Lambda)(16)O. Precise energies have determined peaks arising from Lambda in s p...
Exploiting the isobar model, kaon photo- and electroproduction on proton in resonance region comes under scrutiny. An upgrade of our previous comprising higher-spin nucleon hyperon exchanges consistent formalism, was accomplished by implementing energy-dependent widths resonances, which leads to a different choice hadron form factor with much softer values cutoff parameter for resonant part. For reliable description electroproduction, necessity including longitudinal couplings resonances...
In the absence of accurate data on free two-body hyperon-nucleon interaction, spectra hypernuclei can provide information details effective interaction. Electroproduction hypernucleus Lambda-9Li has been studied for first time with sub-MeV energy resolution in Hall A at Jefferson Lab a 9Be target. order to increase counting rate and unambiguous kaon identification, two superconducting septum magnets Ring Imaging CHerenkov detector (RICH) were added standard equipment. The cross section...
The recent CLAS 2005, SAPHIR 2003, LEPS, and the old, pre-1972, data on ${K}^{+}\ensuremath{\Lambda}$ photoproduction are compared with theoretical calculations in energy region of ${E}_{\ensuremath{\gamma}}^{\mathrm{lab}}<2.6$ GeV order to learn about their mutual consistency. isobaric models Kaon-Maid Saclay-Lyon, along new fits data, utilized this analysis. 2003 shown be coherently shifted down respect CLAS, pre-1972 especially at forward kaon angles. hemisphere can described...
The photoproduction process of neutral kaons on a liquid deuterium target is investigated near the threshold region, Eγ=0.8−1.1 GeV. K0 events are reconstructed from positive and negative pions, differential cross sections derived. Experimental momentum spectra compared with those calculated in spectator model using realistic deuteron wave function. Elementary amplitudes as given by recent isobar models simple phenomenological used to study effect new data angular behavior elementary...
The status and parameters of the scalar, vector, tensor mesonic resonances are obtained in multichannel analysis processes $\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}$, $K\overline{K}$, $\ensuremath{\eta}\ensuremath{\eta}$, $\ensuremath{\eta}{\ensuremath{\eta}}^{\ensuremath{'}}$ compared with other results. For example, we ${f}_{0}(600)$ meson mass $774\ifmmode\pm\else\textpm\fi{}15\text{ }\text{ }\mathrm{MeV}$ width...
The experiment E94-107 in Hall A at Jefferson Lab started a systematic study of high-resolution hypernuclear spectroscopy the $0p$-shell region nuclei such as hypernuclei produced electroproduction on $^{9}\mathrm{Be},\phantom{\rule{0.16em}{0ex}}^{12}\mathrm{C}$, and $^{16}\mathrm{O}$ targets. In order to increase counting rates provide unambiguous kaon identification, two superconducting septum magnets ring-imaging Cherenkov detector were added standard equipment. high-quality beam, good...
The kaon electroproduction reaction 1H(e,e'K+)Lambda was studied as a function of the virtual-photon four-momentum, Q2, total energy, W, and momentum transfer, t, for different values virtual- photon polarization parameter. Data were taken at electron beam energies ranging from 3.40 to 5.75 GeV. center mass cross section determined 21 kinematics corresponding Q2 1.90 2.35 GeV2 longitudinal, sigmaL, transverse, sigmaT, sections separated using Rosenbluth technique fixed W t. reveal flat...
We report a new measurement of the beam-spin asymmetry $\boldsymbol{\Sigma}$ for $\vec{\gamma} n \rightarrow K^+\Sigma^-$ reaction using quasi-free neutrons in liquid-deuterium target. The dataset includes data at previously unmeasured photon energy and angular ranges, thereby providing constraints on partial wave analyses used to extract properties excited nucleon states. experimental were obtained CEBAF Large Acceptance Spectrometer (CLAS), housed Hall B Thomas Jefferson National...
The experimental data on the processes $\pi\pi\to\pi\pi,K\bar{K},\eta\eta,\eta\eta^\prime$ in $I^GJ^{PC}=0^+0^{++}$ channel have been jointly analyzed to study status and nature of $f_0$. method analysis is based analyticity unitarity uses an uniformization procedure. Some spectroscopic implications from results are discussed.
A reanalysis of $\ensuremath{\pi}\ensuremath{\pi}$ amplitudes for all important partial waves below about 2 GeV is presented. set once subtracted dispersion relations with imposed crossing symmetry condition used to modify unitary multichannel in the $S$, $P$, $D$, and $F$ waves. So far, these specific constructed our works many other analyses have been fitted only experimental data therefore do not fulfill condition. In present analysis, self-consistent, i.e., fulfilling symmetry, are...
Recently hypernuclear electroproduction experiments have been successfully carried out at the Thomas Jefferson Laboratory, providing high-resolution spectroscopic data. This article discusses several facets inherent to this reaction process: First, numerous theoretical attempts in describing elementary kaon photoproduction are summarized so as choose appropriate amplitudes be used for production estimates. The process is characterized by both sizable momentum transfer and spin-flip dominace...
Cross-section measurements of the exclusive p(e, e′K +)Λ, Σ 0electroproduction reactions have been performed at Mainz Microtron MAMI in A1 spectrometer facility using for first time KAOS kaon detection. These processes were studied a kinematical region not covered by any previous experiment. The nucleon was probed its third-resonance with virtual photons low four-momenta, Q 2 = 0.030–0.055 (GeV/c)2. data indicate smooth transition Q2 from photoproduction to electroproduction cross-sections....
The kaon photo-production process on 12C has been studied by measuring neutral kaons in the photon energy range of 0.8–1.1 GeV. Neutral were identified invariant mass constructed from two charged pions emitted KS0→π+π− decay channel. differential and integrated cross sections threshold region obtained. obtained momentum spectra compared with a Spectator model calculation using elementary amplitudes given recent isobar models. present results provide first information n(γ,K0)Λ reaction, which...
A set of well-known once subtracted dispersion relations with imposed crossing symmetry condition is used to modify unitary multichannel $S$ ($\ensuremath{\pi}\ensuremath{\pi}$, $K\overline{K}$, and $\ensuremath{\eta}\ensuremath{\eta}$) $P$ $\ensuremath{\rho}2\ensuremath{\pi}$, $\ensuremath{\rho}\ensuremath{\sigma}$) wave amplitudes mostly below 1 GeV. Before the modifications, these significantly did not satisfy describe $\ensuremath{\pi}\ensuremath{\pi}$ threshold region. Moreover, pole...
The coupled processes -- the pion-pion scattering and pi --> K antiK in I^GJ^{PC}=0^+0^{++} channel are analyzed (both separately combined) a model-independent approach based on analyticity unitarity using uniformization procedure. It is shown: 1) structure of Riemann surface S-matrix for considered must be allowed calculating both amplitudes resonance parameters, such as mass width; 2) combined analysis needed only pi-pi does not give correct values parameters even if included.
The peculiarities of obtaining parameters for broad multi-channel resonances from data are discussed, analyzing the experimental on processes in IGJPC = 0+0++ channel a model-independent approach based analyticity and unitarity, using an uniformization procedure. We show that it is possible to obtain good description ππ scattering threshold 1.89 GeV with cited Particle Data Group tables as preferred. However, this case, first, representation background unsatisfactory; second, coupled process...