R. Kurjata
A5012302599- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Dark Matter and Cosmic Phenomena
- Optical Imaging and Spectroscopy Techniques
- Photoacoustic and Ultrasonic Imaging
- Sensor Technology and Measurement Systems
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Scientific Measurement and Uncertainty Evaluation
- Cold Atom Physics and Bose-Einstein Condensates
- Cardiovascular Health and Disease Prevention
- Non-Invasive Vital Sign Monitoring
- Calibration and Measurement Techniques
- Advanced MRI Techniques and Applications
- Nuclear physics research studies
- Hemodynamic Monitoring and Therapy
- Random Matrices and Applications
- Greenhouse Technology and Climate Control
Warsaw University of Technology
2016-2025
University of Aveiro
2017-2023
A. Alikhanyan National Laboratory
2023
University of Bern
2023
Albert Einstein College of Medicine
2023
Eötvös Loránd University
2023
Boston University
2013-2023
Duke University
2018-2023
Universidad Autónoma de Madrid
2018-2023
University of California, Irvine
2013-2023
The calorimeter, range detector and active target elements of the T2K near detectors rely on Hamamatsu Photonics Multi-Pixel Photon Counters (MPPCs) to detect scintillation light produced by charged particles. Detailed measurements MPPC gain, afterpulsing, crosstalk, dark noise, photon detection efficiency for low levels are reported. In order account impact behavior physics observables, a simulation program has been developed based these measurements. is used predict energy resolution detector.
The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)\pi$. With mass too close and width smaller than ground state $a_1(1260)$, it was immediately interpreted as light exotic meson, similar $X$, $Y$, $Z$ states in hidden-charm sector. We show that fully matching experimental data is produced by decay of $a_1(1260)$ resonance into $K^\ast(\to K\pi)\bar{K}$ subsequent rescattering through...
We study the spin-exotic $J^{PC} = 1^{-+}$ amplitude in single-diffractive dissociation of 190 GeV$/c$ pions into $\pi^-\pi^-\pi^+$ using a hydrogen target and confirm $\pi_1(1600) \to \rho(770) \pi$ amplitude, which interferes with nonresonant $1^{-+}$ amplitude. demonstrate that conflicting conclusions from previous studies on these amplitudes can be attributed to different analysis models treatment dependence squared four-momentum transfer we thus reconcile their experimental findings....
The production of vector mesons in deep inelastic scattering is an interesting yet scarsely explored channel to study the transverse spin structure nucleon and related phenomena. COMPASS collaboration has performed first measurement Collins Sivers asymmetries for inclusively produced $\rho^0$ mesons. analysis based on data set collected $2010$ using a $160\,\,\rm{GeV}/c$ $\mu^+$ beam impinging transversely polarized $\rm{NH}_3$ target. $\rho^{0}$ are selected from oppositely charged hadron...
We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $\omega$ meson muoproduction the proton at COMPASS using 160 GeV/$c$ polarised $ \mu ^{+}$ and ^{-}$ beams impinging liquid hydrogen target. The covers range 5.0 GeV/$c^2$ $< W <$ 17.0 GeV/$c^2$, with average kinematics $\langle Q^{2} \rangle=$ 2.1 (GeV/$c$)$^2$, \rangle= 7.6$ p^{2}_{\rm T} \rangle = 0.16$ (GeV/$c$)$^2$. Here, $Q^2$ denotes virtuality exchanged photon, $W$ mass final hadronic system $p_T$...
A set of measurements azimuthal asymmetries in the production pairs identified hadrons deep-inelastic scattering muons on transversely polarised 6LiD (deuteron) and NH3 (proton) targets is presented. All available data collected years 2003–2004 2007/2010 with COMPASS spectrometer using a muon beam 160GeV/c at CERN SPS were analysed. The provide access to transversity distribution functions via fragmentation function that principle may be independently obtained from e+e− annihilation data....
New results are presented on a high-statistics measurement of Collins and Sivers asymmetries charged hadrons produced in deep inelastic scattering muons transversely polarized ^{6}LiD target. The data were taken 2022 with the COMPASS spectrometer using 160 GeV muon beam at CERN, statistically balancing existing proton targets. first from about two-thirds new have total uncertainties smaller by up to factor three compared previous deuteron measurements. Using all results, both transversity...
Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\rho ^0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>ρ</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> meson muoproduction at COMPASS using 160 GeV/ c polarised $$ \mu ^{+}$$ <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> and ^{-}$$ <mml:mo>-</mml:mo> beams impinging liquid hydrogen target. The covers the kinematic range 5.0 $$c^2$$ <mml:mi>c</mml:mi>...
The antiparticle-over-particle multiplicity ratio is measured in deep-inelastic scattering for negatively and positively charged kaons and, the first time, antiprotons protons. data were obtained by COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar 6LiD target. regime of ensured requiring Q2 > 1 (GeV/c)2 photon virtuality W>5 GeV/c2 invariant mass produced hadronic system. Bjorken-x restricted to range 0.01 0.40. Protons are identified momentum from 20 GeV/c 60...
New results are presented on a high-statistics measurement of Collins and Sivers asymmetries charged hadrons produced in deep inelastic scattering muons transversely polarised $^6$LiD target. The data were taken 2022 with the COMPASS spectrometer using 160 \gevv\ muon beam at CERN, balancing existing proton targets. first from about two-thirds new have total uncertainties smaller by up to factor three compared previous deuteron measurements. Using all results, both transversity distribution...
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c π^{-} beam impinging on transversely polarized ammonia target. Combining data both years, we present final results amplitudes five azimuthal modulations, which correspond to transverse-spin-dependent asymmetries (TSAs) dimuon production cross section. Three them probe nucleon leading-twist Sivers, transversity, pretzelosity transverse-momentum dependent (TMD) parton distribution...
An upgrade of the near detector T2K long baseline neutrino oscillation experiment is currently being conducted. This will include two new Time Projection Chambers, each equipped with 16 charge readout resistive Micromegas modules. A procedure to validate performance detectors at different stages production has been developed and implemented ensure a proper reliable operation once installed. dedicated X-ray test bench used characterize by scanning pad individually precisely measure uniformity...
The multiplicities of positive and negative pions, kaons unidentified hadrons produced in deep-inelastic scattering are measured bins the Bjorken scaling variable $x$, relative virtual-photon energy $y$ fraction transferred to final-state hadron $z$. Data were obtained by COMPASS Collaboration using a 160 GeV muon beam both electric charges liquid hydrogen target. These measurements cover kinematic domain with photon virtuality $Q^2 > 1$ (GeV/$c)^2$, $0.004 < x 0.4$, $0.1 y 0.7$ $0.2 z...
A new and detailed measurement of the cross section for hard exclusive neutral-pion muoproduction on proton was performed in a wide kinematic region, with photon virtuality $Q^2$ ranging from 1 to 8 (GeV/$c$)$^{\rm\, 2}$ Bjorken variable $x_{\rm Bj}$ 0.02 0.45. The data were collected at COMPASS CERN using 160 GeV/$c$ longitudinally polarised $\mu^+$ $\mu^-$ beams scattering off 2.5 m long liquid hydrogen target. From average measured sections, virtual-photon--proton is determined as...
The paper presents the experimental validation of coronary blood flow measured from coronarographic images. method measurement earlier presented is based on elements indicator-dilution theory and idea using two sequences images obtained during standard examination. Measurements image intensity along cross-section lines artery were performed sequence with injection contrast small quantity slowly injected contrast. These enable construction relative concentration curve in defined vs. time....
The Use of the Monte Carlo Method to Determine Optical Parameters Tissue paper presents use method determine optical parameters tissue from steady-state diffuse reflectance measurements.