Publikacje

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Publikacje z roku: 2023

artykuł w czasopiśmie

  1. A modular data acquisition system for reconstruction of radiation dose spatial distribution in radiotherapy treatment planning [2023]

    Autorzy: Jurgielewicz Paweł, Filipek Marcin, Fiutowski Tomasz, Kalecińska Kamila, Kopeć Maciej, Koperny Stefan, Moroń Jakub, Wiącek Piotr, Szumlak Tomasz, Mindur Bartosz

    Wydawnictwo: Nuclear Instruments & Methods in Physics Research, Section A, Accelerators Spectrometers, Detectors and Associated Equipment

    In this work we propose the complete Data Acquisition (DAQ) system for measurement of volumetric radiotherapeutic dose deposition in tissue-like phantoms based on 3D printed plastic scintillators. The DAQ is easily extensible thanks to the modular architecture of its hardware and software components. We show results from the full measurement chain indicating proper operation of the system.

    Źródło: https://www.sciencedirect.com/science/article/pii/S0168900222008993/pdfft?md5=9f3314882e92a8a3492b85d01622a260&pid=1-s2.0-S0168900222008993-main.pdf

    DOI: 10.1016/j.nima.2022.167607

    Otwarty dostęp: tak

  2. A reconfigurable detector for measuring the spatial distribution of radiation dose for applications in the preparation of individual patient treatment plans [2023]

    Autorzy: Kopeć Maciej, Fiutowski Tomasz, Jurgielewicz Paweł, Kalecińska Kamila, Koperny Stefan, Moroń Jakub, Wiącek Piotr, Szumlak Tomasz, Mindur Bartosz

    Wydawnictwo: Nuclear Instruments & Methods in Physics Research, Section A, Accelerators Spectrometers, Detectors and Associated Equipment

    In this work, a novel reconfigurable Dose-3D detector intended for a full spatial therapeutic dose measurement to improve radiotherapy treatment planning is presented. The device is composed of a reconfigurable detection phantom allowing patient-centric adjustments to its geometry, a scalable data acquisition system (including hardware, firmware, and low-level software) designed to change with the phantom’s configuration seamlessly, and a high-level software package for tumour geometry extraction based on computer tomography scans. Extracted geometry will be used in the Monte Carlo simulations and the configuration of the phantom. Each of the components to be used in the measurement system has been assessed obtaining the following results. The scintillating voxels’ light output is sufficient. The data acquisition system with its hardware and software has been tested using artificial testing signals and laser light proving a reliable and robust means of physics data reconstruction. © 2022 Elsevier B.V.

    Źródło: https://www.sciencedirect.com/science/article/pii/S0168900222012293/pdfft?md5=770a3f753b8a0df8027c9f9c309f702d&pid=1-s2.0-S0168900222012293-main.pdf

    DOI: 10.1016/j.nima.2022.167937

    Otwarty dostęp: tak

  3. Correlations between flow and transverse momentum in Xe + Xe and Pb + Pb collisions at the LHC with the ATLAS detector: a probe of the heavy-ion initial state and nuclear deformation [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Cieśla Krzysztof, Dąbrowski Władysław, Dyndał Mateusz, Gilbert Alexander, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Przybycień Mariusz, Sikora Rafał

    Wydawnictwo: Physical Review, C

    The correlations between flow harmonics vn for n=2, 3, and 4 and mean transverse momentum [pT] in 129Xe+129Xe and 208Pb+208Pb collisions at √s=5.44 and 5.02 TeV, respectively, are measured using charged particles with the ATLAS detector. The correlations are potentially sensitive to the shape and size of the initial geometry, nuclear deformation, and initial momentum anisotropy. The effects from nonflow and centrality fluctuations are minimized, respectively, via a subevent cumulant method and an event-activity selection based on particle production at very forward rapidity. The vn−[pT] correlations show strong dependencies on centrality, harmonic number n, pT, and pseudorapidity range. Current models qualitatively describe the overall centrality- and system-dependent trends but fail to quantitatively reproduce all features of the data. In central collisions, where models generally show good agreement, the v2−[pT] correlations are sensitive to the triaxiality of the quadruple deformation. Comparison of the model with the Pb+Pb and Xe+Xe data confirms that the 129Xe nucleus is a highly deformed triaxial ellipsoid that has neither a prolate nor oblate shape. This provides strong evidence for a triaxial deformation of the 129Xe nucleus from high-energy heavy-ion collisions.

    Źródło: https://journals.aps.org/prc/pdf/10.1103/PhysRevC.107.054910

    DOI: 10.1103/PhysRevC.107.054910

    Otwarty dostęp: tak

  4. Differential t\bart cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb^−1 of ATLAS data [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Dąbrowski Władysław, Dyndał Mateusz, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Palni Prabhakar, Przybycień Mariusz

    Wydawnictwo: The Journal of High Energy Physics

    Measurements of single-, double-, and triple-differential cross-sections are presented for boosted top-quark pair-production in 13 TeV proton–proton collisions recorded by the ATLAS detector at the LHC. The top quarks are observed through their hadronic decay and reconstructed as large-radius jets with the leading jet having transverse momentum (pT) greater than 500 GeV. The observed data are unfolded to remove detector effects. The particle-level cross-section, multiplied by the tt¯ → WWbb¯ branching fraction and measured in a fiducial phase space defined by requiring the leading and second-leading jets to have pT> 500 GeV and pT> 350 GeV, respectively, is 331 ± 3(stat.) ± 39(syst.) fb. This is approximately 20% lower than the prediction of 398−49+48 fb by Powheg+Pythia 8 with next-to-leading-order (NLO) accuracy but consistent within the theoretical uncertainties. Results are also presented at the parton level, where the effects of top-quark decay, parton showering, and hadronization are removed such that they can be compared with fixed-order next-to-next-to-leading-order (NNLO) calculations. The parton-level cross-section, measured in a fiducial phase space similar to that at particle level, is 1.94 ± 0.02(stat.) ± 0.25(syst.) pb. This agrees with the NNLO prediction of 1.96−0.17+0.02 pb. Reasonable agreement with the differential cross-sections is found for most NLO models, while the NNLO calculations are generally in better agreement with the data. The differential cross-sections are interpreted using a Standard Model effective field-theory formalism and limits are set on Wilson coefficients of several four-fermion operators.

    Źródło: https://link.springer.com/content/pdf/10.1007/JHEP04(2023)080.pdf?pdf=button

    DOI: 10.1007/JHEP04(2023)080

    Otwarty dostęp: tak

  5. Measurement of CP asymmetries in D^+(s)\to\eta\pi^+ and D^+(s)\to\eta’\pi^+ decays [2023]

    Autorzy: Firlej Mirosław, Fiutowski Tomasz, Idzik Marek, Kopciewicz Paweł, Krupa Wojciech, Kucewicz Wojciech, Majewski Maciej W., Moroń Jakub, Obłąkowska-Mucha Agnieszka, Rachwał Bartłomiej, Ryżka Jakub, Szumlak Tomasz, Świentek Krzysztof

    Wydawnictwo: The Journal of High Energy Physics

    Searches for CP violation in the decays D(s)+→ηπ+ and D(s)+→η′π+ are performed using pp collision data corresponding to 6 fb−1 of integrated luminosity collected by the LHCb experiment. The calibration channels D(s)+→ϕπ+ are used to remove production and detection asymmetries. The resulting CP-violating asymmetries areACP=(D+→ηπ+)=(0.34±0.66±0.16±0.05)%,ACP=(Ds+→ηπ+)=(0.32±0.51±0.12)%,ACP=(D+→η′π+)=(0.49±0.18±0.06±0.05)%,ACP=(Ds+→η′π+)=(0.01±0.12±0.08)%, where the first uncertainty is statistical, the second is systematic and the third, relevant for the D+ channels, is due to the uncertainty on ACP= (D+→ ϕπ+). These measurements, currently the most precise for three of the four channels considered, are consistent with the absence of CP violation. A combination of these results with previous LHCb measurements is presented.

    Źródło: https://link.springer.com/content/pdf/10.1007/JHEP04(2023)081.pdf?pdf=button

    DOI: 10.1007/JHEP04(2023)081

    Otwarty dostęp: tak

  6. Measurement of muon pairs produced via \gamma\gamma scattering in nonultraperipheral Pb + Pb collisions at \sqrtsNN = 5.02 TeV with the ATLAS detector [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Cieśla Krzysztof, Dąbrowski Władysław, Dyndał Mateusz, Gilbert Alexander, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Przybycień Mariusz, Sikora Rafał

    Wydawnictwo: Physical Review, C

    Results of a measurement of dimuon photoproduction in nonultraperipheral Pb+Pb collisions at √sNN = 5.02 TeV are presented. The measurement uses ATLAS data from the 2015 and 2018 Pb+Pb data-taking periods at the LHC with an integrated luminosity of 1.94 nb−1. The γγ → μ+μ− pairs are identified via selections on pair momentum asymmetry and acoplanarity. Differential cross sections for dimuon production are measured in different centrality, average muon momentum, and pair rapidity intervals as functions of acoplanarity and k⊥, the transverse momentum kick of one muon relative to the other. Measurements are also made as a function of the rapidity separation of the muons and the angle of the muon pair relative to the second-order event plane to test whether magnetic fields generated in the quark-gluon plasma affect the measured muons. A prior observation of a centrality-dependent broadening of the acoplanarity distribution is confirmed. Furthermore, the improved precision of the measurement reveals a depletion in the number of pairs having small acoplanarity or k⊥ values in more central collisions. The acoplanarity distributions in a given centrality interval are observed to vary with the mean pT of the muons in the pair, but the k⊥ distributions do not. Comparisons with recent theoretical predictions are made. The predicted trends associated with effects of magnetic fields on the dimuons are not observed.

    Źródło: https://journals.aps.org/prc/pdf/10.1103/PhysRevC.107.054907

    DOI: 10.1103/PhysRevC.107.054907

    Otwarty dostęp: tak

  7. Measurement of substructure-dependent jet suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Cieśla Krzysztof, Dąbrowski Władysław, Dyndał Mateusz, Gilbert Alexander, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Przybycień Mariusz, Sikora Rafał

    Wydawnictwo: Physical Review, C

    The ATLAS detector at the Large Hadron Collider has been used to measure jet substructure modification and suppression in Pb+Pb collisions at a nucleon-nucleon center-of-mass energy root sNN = 5.02 TeV in comparison with proton-proton (pp) collisions at root s = 5.02 TeV. The Pb+Pb data, collected in 2018, have an integrated luminosity of 1.72 nb(-1), while the pp data, collected in 2017, have an integrated luminosity of 260 pb(-1). Jets used in this analysis are clustered using the anti-k(t) algorithm with a radius parameter R = 0.4. The jet constituents, defined by both tracking and calorimeter information, are used to determine the angular scale rg of the first hard splitting inside the jet by reclustering them using the Cambridge-Aachen algorithm and employing the soft-drop grooming technique. The nuclear modification factor, RAA, used to characterize jet suppression in Pb+Pb collisions, is presented differentially in rg, jet transverse momentum, and in intervals of collision centrality. The RAA value is observed to depend significantly on jet r(g). Jets produced with the largest measured r(g) are found to be twice as suppressed as those with the smallest rg in central Pb+Pb collisions. The RAA values do not exhibit a strong variation with jet p(T) in any of the rg intervals. The r(g) and p(T) dependence of jet RAA is qualitatively consistent with a picture of jet quenching arising from coherence and provides the most direct evidence in support of this approach.

    Źródło: https://journals.aps.org/prc/pdf/10.1103/PhysRevC.107.054909

    DOI: 10.1103/PhysRevC.107.054909

    Otwarty dostęp: tak

  8. Measurement of the nuclear modification factor of b-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Cieśla Krzysztof, Dąbrowski Władysław, Dyndał Mateusz, Gilbert Alexander, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Przybycień Mariusz, Sikora Rafał

    Wydawnictwo: European Physical Journal, C

    This paper presents a measurement of b-jet production in Pb+Pb and pp collisions at sNN=5.02 TeV with the ATLAS detector at the LHC. The measurement uses 260 pb – 1 of pp collisions collected in 2017 and 1.4 nb – 1 of Pb+Pb collisions collected in 2018. In both collision systems, jets are reconstructed via the anti- kt algorithm. The b-jets are identified from a sample of jets containing muons from the semileptonic decay of b-quarks using template fits of the muon momentum relative to the jet axis. In pp collisions, b-jets are reconstructed for radius parameters R= 0.2 and R= 0.4 , and only R= 0.2 jets are used in Pb+Pb collisions. For comparison, inclusive R= 0.2 jets are also measured using 1.7 nb – 1 of Pb+Pb collisions collected in 2018 and the same pp collision data as the b-jet measurement. The nuclear modification factor, RAA , is calculated for both b-jets and inclusive jets with R= 0.2 over the transverse momentum range of 80–290 GeV. The nuclear modification factor for b-jets decreases from peripheral to central collisions. The ratio of the b-jet RAA to inclusive jet RAA is also presented and suggests that the RAA for b-jets is larger than that for inclusive jets in central Pb+Pb collisions. The measurements are compared with theoretical calculations and suggest a role for mass and colour-charge effects in partonic energy loss in heavy-ion collisions.

    Źródło: https://link.springer.com/content/pdf/10.1140/epjc/s10052-023-11427-9.pdf?pdf=button

    DOI: 10.1140/epjc/s10052-023-11427-9

    Otwarty dostęp: tak

  9. Measurement of the total and differential Higgs boson production cross-sections at \sqrts = 13 TeV with the ATLAS detector by combining the H \to ZZ^* \to 4\ell and H \to \gamma\gamma decay channels [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Cieśla Krzysztof, Dąbrowski Władysław, Dyndał Mateusz, Gilbert Alexander, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Przybycień Mariusz, Sikora Rafał

    Wydawnictwo: The Journal of High Energy Physics

    The total and differential Higgs boson production cross-sections are measured through a combined statistical analysis of the H → ZZ * → 4ℓ and H → γγ decay channels. The results are based on a dataset of 139 fb −1 of proton–proton collisions at a centre-of-mass energy of 13 TeV, recorded by the ATLAS detector at the Large Hadron Collider. The measured total Higgs boson production cross-section is 55.5−3.8+4.0 pb, consistent with the Standard Model prediction of 55.6 ± 2.5 pb. All results from the two decay channels are compatible with each other, and their combination agrees with the Standard Model predictions. A combined statistical interpretation of the measured fiducial cross-sections as a function of the Higgs boson transverse momentum is performed in order to probe the Yukawa couplings to the bottom and charm quarks. A similar interpretation is performed by including also the constraints from the measurements of Higgs boson production in association with a W or Z boson in the H → bb¯ and cc¯ decay channels.

    Źródło: https://link.springer.com/content/pdf/10.1007/JHEP05(2023)028.pdf?pdf=button

    DOI: 10.1007/JHEP05(2023)028

    Otwarty dostęp: tak

  10. Measurement of the total cross section and \rho-parameter from elastic scattering in pp collisions at \sqrts=13 TeV with the ATLAS detector [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Cieśla Krzysztof, Dąbrowski Władysław, Dyndał Mateusz, Gilbert Alexander, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Przybycień Mariusz, Sikora Rafał

    Wydawnictwo: European Physical Journal, C

    In a special run of the LHC with β⋆= 2.5 km, proton–proton elastic-scattering events were recorded at s=13 TeV with an integrated luminosity of 340μb-1 using the ALFA subdetector of ATLAS in 2016. The elastic cross section was measured differentially in the Mandelstam t variable in the range from – t= 2.5 · 10 – 4 GeV 2 to – t= 0.46 GeV 2 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section σtot , parameters of the nuclear slope, and the ρ -parameter defined as the ratio of the real part to the imaginary part of the elastic-scattering amplitude in the limit t→ 0 . These parameters are determined from a fit to the differential elastic cross section using the optical theorem and different parameterizations of the t-dependence. The results for σtot and ρ are σtot(pp→X)=104.7±1.1mb,ρ=0.098±0.011. The uncertainty in σtot is dominated by the luminosity measurement, and in ρ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.

    Źródło: https://link.springer.com/content/pdf/10.1140/epjc/s10052-023-11436-8.pdf?pdf=button

    DOI: 10.1140/epjc/s10052-023-11436-8

    Otwarty dostęp: tak

  11. Measurements of the suppression and correlations of dijets in Pb+Pb collisions at \sqrtsNN = 5.02 TeV [2023]

    Autorzy: Adamczyk Leszek, Bołd Tomasz, Cieśla Krzysztof, Dąbrowski Władysław, Dyndał Mateusz, Gilbert Alexander, Grabowska-Bołd Iwona, Janas Krzysztof W., Koperny Stefan, Łakomiec Inga K., Maj Klaudia, Mindur Bartosz, Ogrodnik Agnieszka, Przybycień Mariusz, Sikora Rafał

    Wydawnictwo: Physical Review, C

    Studies of the correlations of the two highest transverse momentum (leading) jets in individual Pb+Pb collision events can provide information about the mechanism of jet quenching by the hot and dense matter created in such collisions. In Pb+Pb and pp collisions at √sNN=5.02TeV, measurements of the leading dijet transverse momentum (pT) correlations are presented. Additionally, measurements in Pb+Pb collisions of the dijet pair nuclear modification factors projected along leading and subleading jet pT are made. The measurements are performed using the ATLAS detector at the LHC with 260 pb−1 of pp data collected in 2017 and 2.2 nb−1 of Pb+Pb data collected in 2015 and 2018. An unfolding procedure is applied to the two-dimensional leading and subleading jet pT distributions to account for experimental effects in the measurement of both jets. Results are provided for dijets with leading jet pT greater than 100 GeV. Measurements of the dijet-yield-normalized xJ distributions in Pb+Pb collisions show an increased fraction of imbalanced jets compared to pp collisions; these measurements are in agreement with previous measurements of the same quantity at 2.76 TeV in the overlapping kinematic range. Measurements of the absolutely normalized dijet rate in Pb+Pb and pp collisions are also presented, and show that balanced dijets are significantly more suppressed than imbalanced dijets in Pb+Pb collisions. It is observed in the measurements of the pair nuclear modification factors that the subleading jets are significantly suppressed relative to leading jets with pT between 100 and 316 GeV for all centralities in Pb+Pb collisions.

    Źródło: https://journals.aps.org/prc/pdf/10.1103/PhysRevC.107.054908

    DOI: 10.1103/PhysRevC.107.054908

    Otwarty dostęp: tak

  12. Medical imaging data analysis using 3D deep learning models towards improving the individual treatment plans [2023]

    Autorzy: Kalecińska Kamila, Fiutowski Tomasz, Jurgielewicz Paweł, Kopeć Maciej, Koperny Stefan, Moroń Jakub, Wiącek Piotr, Mindur Bartosz, Szumlak Tomasz

    Wydawnictwo: Nuclear Instruments & Methods in Physics Research, Section A, Accelerators Spectrometers, Detectors and Associated Equipment

    This work is a part of a research project aiming at delivering the next generation active medical phantom, Dose-3D, with high spatial granulation for quasi-real time measurement of the volumetric radiotherapeutic dose deposited during photon therapy. The preliminary results, discussed here, pertain to the intelligent medical data augmentation using Generative Adversarial Networks (GANs) technique implemented inside MONAI framework. However, in the scope of the project, we perform a broad search for the most efficient and advanced Deep Learning (DL) models to create tools for 3D Computed Tomography (CT) images segmentation and cancer diagnosis improvement that will be an integral part of the custom designed software platform for processing data collected with Dose-3D phantom. Apart from the innovative detection system the software itself may prove to be disruptive in the context of the currently available tools by offering open-source high quality toolkit for wide use in everyday clinical applications.

    Źródło: https://www.sciencedirect.com/science/article/pii/S0168900222012438/pdfft?md5=5310252ebece94b0bbd5f1e73117b0ec&pid=1-s2.0-S0168900222012438-main.pdf

    DOI: 10.1016/j.nima.2022.167951

    Otwarty dostęp: tak

  13. Observation of electroweak production of two jets and a Z-boson pair [2023]

    Autorzy: Adamczyk Leszek Bołd Tomasz Dąbrowski Władysław Grabowska-Bołd Iwona Janas Krzysztof W. Janus Piotr Koperny Stefan Kremer Jakub Łakomiec Inga K. Maj Klaudia Mindur Bartosz Ogrodnik Agnieszka Palni Prabhakar Przybycień Mariusz

    Wydawnictwo: Nature Physics

    Electroweak symmetry breaking explains the origin of the masses of elementary particles through their interactions with the Higgs field. Besides the measurements of the Higgs boson properties, the study of the scattering of massive vector bosons with spin 1 allows the nature of electroweak symmetry breaking to be probed. Among all processes related to vector-boson scattering, the electroweak production of two jets and a Z-boson pair is a rare and important one. Here we report the observation of this process from proton–proton collision data corresponding to an integrated luminosity of 139 fb−1 recorded at a centre-of-mass energy of 13 TeV with the ATLAS detector at the Large Hadron Collider. We consider two different final states originating from the decays of the Z-boson pair: one containing four charged leptons and another containing two charged leptons and two neutrinos. The hypothesis of no electroweak production is rejected with a statistical significance of 5.7σ, and the measured cross-section for electroweak production is consistent with the Standard Model prediction. In addition, we report cross-sections for inclusive production of a Z-boson pair and two jets for the two final states.

    Źródło: https://www.nature.com/articles/s41567-022-01757-y.pdf

    DOI: 10.1038/s41567-022-01757-y

    Otwarty dostęp: tak

  14. Observation of four-top-quark production in the multilepton final state with the ATLAS detector [2023]

    Autorzy: Adamczyk Leszek Balek Petr Bołd Tomasz Cieśla Krzysztof Dąbrowski Władysław Dyndał Mateusz Gilbert Alexander Grabowska-Bołd Iwona Janas Krzysztof W. Koperny Stefan Łakomiec Inga K. Maj Klaudia Mindur Bartosz Potępa Patrycja Anna Przybycień Mariusz Sikora Rafał

    Wydawnictwo: European Physical Journal, C

    This paper presents the observation of four-top-quark (tt¯tt¯) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb−1 at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5+6.6−5.5 fb, consistent with the SM prediction of 12.0±2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect tt¯tt¯ production.

    Źródło: https://link.springer.com/content/pdf/10.1140/epjc/s10052-023-11573-0.pdf?pdf=button

    DOI: 10.1140/epjc/s10052-023-11573-0

    Otwarty dostęp: tak

  15. Production tests of front-end electronics for Straw Tube Trackers in HADES and PANDA experiments at FAIR [2023]

    Autorzy: Firlej Mirosław, Fiutowski Tomasz, Idzik Marek, Malige Akshay, Molenda Aleksandra, Moroń Jakub, Świentek Krzysztof

    Wydawnictwo: Journal of Instrumentation

    PASTTREC is an 8-channel readout Application-Specific Integrated Circuit (ASIC) designed for the Straw Tracking System (STS) in the HADES experiment and for the Straw Tube Tracker (STT) and the Forward Tracker (FT) detectors in the PANDA experiment, both at the FAIR facility. Since more than 5000 ASICs were produced for both experiments, efficient qualification tests are required. For this purpose, the multi-chip test setup and dedicated verification procedures were developed. In this paper, the measurement results for the first batch of 140 Front-End Boards (FEBs), each hosting two ASICs, are presented. Since a significant number (280) of PASTTREC chips were tested, obtained statistical distributions of key parameters are also reported. The estimated yield (97%) and the process-related spread of the chip parameters are discussed.

    Źródło: https://iopscience.iop.org/article/10.1088/1748-0221/18/05/P05008/pdf

    DOI: 10.1088/1748-0221/18/05/P05008

    Otwarty dostęp: tak

  16. Roadmap on artificial intelligence and big data techniques for superconductivity [2023]

    Autorzy: Skoczeń Andrzej, Wielgosz Maciej

    Wydawnictwo: Superconductor Science & Technology

    This paper presents a roadmap to the application of AI techniques and big data (BD) for different modelling, design, monitoring, manufacturing and operation purposes of different superconducting applications. To help superconductivity researchers, engineers, and manufacturers understand the viability of using AI and BD techniques as future solutions for challenges in superconductivity, a series of short articles are presented to outline some of the potential applications and solutions. These potential futuristic routes and their materials/technologies are considered for a 10-20 yr time-frame.

    Źródło: https://iopscience.iop.org/article/10.1088/1361-6668/acbb34/pdf

    DOI: 10.1088/1361-6668/acbb34

    Otwarty dostęp: tak

  17. The upgraded quench protection system for main quadrupoles in the LHC [2023]

    Autorzy: Skoczeń Andrzej

    Wydawnictwo: Journal of Instrumentation

    The protection of superconducting magnets is a very important issue and demanding challenge in the LHC and other superconducting accelerating facilities. The quench phenomenon can destroy components of the accelerator, and therefore this digital system was designed, implemented, tested, and installed near each superconducting magnet in the LHC tunnel. The quench detection principle relies on the extraction of resistive voltage by compensation of the inductive part of the voltage. This article presents briefly the architecture applied to the design and the validation of the FPGA-based quench detector for the main quadrupoles of the LHC. The article focusses on digital design with the use of FPGA by VHDL coding and on the verification by simulation. The design is a replacement for the old detection system.

    Źródło: https://iopscience.iop.org/article/10.1088/1748-0221/18/01/T01004/pdf

    DOI: 10.1088/1748-0221/18/01/T01004

    Otwarty dostęp: tak

referat w czasopiśmie

  1. Development of the radiation and magnetic field tolerant DC/DC converter system for the ATLAS ITk Strip Detector [2023]

    Autorzy: Dyndał Mateusz, Cieśla Krzysztof, Dąbrowski Władysław, Koperny Stefan, Korba Andrzej, Wiącek Piotr

    Wydawnictwo: Journal of Instrumentation

    The radiation and magnetic field tolerant step-down DC/DC converter system is developed to supply low-voltage power for the ATLAS ITk Strip Detector. The system is modular and consists of custom designed crates with embedded cooling plates, backplane, and DC/DC converter modules. Each converter module comprises two or four power channels. Each channel comprises a 48-to-11 V DC/DC converter, hardware overcurrent and overvoltage protection circuits, correction circuitry to compensate for voltage drops along the cables, and control and monitoring functionality based on the AMACStar chip. We present the design and performance of such a DC/DC converter system, including evaluation of its radiation tolerance.

    Źródło: https://iopscience.iop.org/article/10.1088/1748-0221/18/01/C01007/pdf

    DOI: 10.1088/1748-0221/18/01/C01007

    Otwarty dostęp: tak

  2. HKROC: an integrated front-end ASIC to readout photomultiplier tubes for the Hyper-Kamiokande experiment [2023]

    Autorzy: Firlej Mirosław, Fiutowski Tomasz, Idzik Marek, Molenda Aleksandra, Moroń Jakub, Świentek Krzysztof

    Wydawnictwo: Journal of Instrumentation

    Journal of Instrumentation The International School for Advanced Studies (SISSA), find out more PAPER HKROC: an integrated front-end ASIC to readout photomultiplier tubes for the Hyper-Kamiokande experiment S. Conforti Di Lorenzo6,1, A. Afiri2, S. Bolognesi3, G. Bombardi4, F. Bouyjou3, S. Callier1, C. De La Taille1, P. Dinaucourt1, O. Drapier2, F. Dulucq1Show full author list Published 17 January 2023 • © 2023 IOP Publishing Ltd and Sissa Medialab Journal of Instrumentation, Volume 18, January 2023 Citation S. Conforti Di Lorenzo et al 2023 JINST 18 C01035 DOI 10.1088/1748-0221/18/01/C01035 DownloadArticle PDF References Download PDF 16 Total downloads Turn on MathJax Get permission to re-use this article Share this article Share this content via email Share on Facebook (opens new window) Share on Twitter (opens new window) Share on Mendeley (opens new window) Hide article information Author e-mails conforti@omega.in2p3.fr Author affiliations 1 OMEGA, CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France 2 Laboratoire Leprince Ringuet, CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France 3 IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France 4 CERN, 1217 Meyrin, Switzerland 5 AGH-University of Science and Technology, 30-059 Krakow, Poland Author notes 6 Corresponding author. Dates Received 19 October 2022 Accepted 15 December 2022 Published 17 January 2023 Buy this article in print Journal RSS Sign up for new issue notifications Create citation alert Abstract The HKROC ASIC was originally designed to readout the photomultiplier tubes (PMTs) for the Hyper-Kamiokande (HK) experiment. HKROC is a very innovative ASIC capable of readout a large number of channels satisfying stringent requirements in terms of noise, speed and dynamic range. Each HKROC channel features a low-noise preamplifier and shapers, a 10-bit successive approximation Analog-to-Digital Converter (SAR-ADC) (designed by AGH Krakow) for the charge measurement (up to 2500 pC) and a Time-to-Digital Converter (TDC) (designed by CEA IRFU group) for the Time-of-Arrival (ToA) measurement with 25 ps binning. HKROC is auto-triggered and includes all necessary ancillary services as bandgap circuit, PLL (Phase-locked loop) and threshold DACs (Digital to Analog Converters). This paper will describe the ASIC architecture and the experimental results of the first HKROC prototype received in January 2022.

    Źródło: https://iopscience.iop.org/article/10.1088/1748-0221/18/01/C01035/pdf

    DOI: 10.1088/1748-0221/18/01/C01035

    Otwarty dostęp: tak

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