We present a review of the CMS search for new high-mass resonances decaying to lepton pair. The search uses pp collision data at a centre-of-mass energy of s=13 Tev collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb−1 and 36.3 fb−1 for electrons and muons, respectively [1]. These data were interpreted in a simplified model of dark matter production via a vector or axial-vector mediator, limits at 95% confidence level are obtained on the masses of the dark matter particle and its mediator.
{"title":"Search for a high-mass dark matter mediator decaying to dilepton final state in the CMS experiment at the LHC","authors":"A. Lanyov, S. Shmatov, I. Zhizhin","doi":"10.1063/5.0064086","DOIUrl":"https://doi.org/10.1063/5.0064086","url":null,"abstract":"We present a review of the CMS search for new high-mass resonances decaying to lepton pair. The search uses pp collision data at a centre-of-mass energy of s=13 Tev collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb−1 and 36.3 fb−1 for electrons and muons, respectively [1]. These data were interpreted in a simplified model of dark matter production via a vector or axial-vector mediator, limits at 95% confidence level are obtained on the masses of the dark matter particle and its mediator.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132311208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The evaluation of the performance of computing resources is important for workload distribution and workload planning. It is usually done with standard benchmark tools. The most well-known benchmark in grid infrastructures in High Energy Physic is HEP-SPEC06. This benchmark is based on industrial benchmark SPEC06. Running of HEP-SPEC06 takes a substantial amount of time but gives a precise estimation of the computing performance of one worknode. DIRAC interware uses the DB12 benchmark for performance estimation. It takes less than a minute to run and gives estimations very close to HEP-SPEC06. When a job is executed on a resource by DIRAC, DB12 benchmark test is performed and results are saved in the database. That means that there is no need to stop operations on computing resources to estimate full performance. It just requires to aggregate information about all individual DB12 results. Aggregation of benchmark results was done in JINR on all big computing components: Tier1, Tier2, Govorun supercomputer, Cloud, and NICA cluster. It did not require to send dedicated jobs since DIRAC was actively used for Monte-Carlo generation.
{"title":"Performance evaluation of computing resources with DIRAC interware","authors":"I. Pelevanyuk","doi":"10.1063/5.0064778","DOIUrl":"https://doi.org/10.1063/5.0064778","url":null,"abstract":"The evaluation of the performance of computing resources is important for workload distribution and workload planning. It is usually done with standard benchmark tools. The most well-known benchmark in grid infrastructures in High Energy Physic is HEP-SPEC06. This benchmark is based on industrial benchmark SPEC06. Running of HEP-SPEC06 takes a substantial amount of time but gives a precise estimation of the computing performance of one worknode. DIRAC interware uses the DB12 benchmark for performance estimation. It takes less than a minute to run and gives estimations very close to HEP-SPEC06. When a job is executed on a resource by DIRAC, DB12 benchmark test is performed and results are saved in the database. That means that there is no need to stop operations on computing resources to estimate full performance. It just requires to aggregate information about all individual DB12 results. Aggregation of benchmark results was done in JINR on all big computing components: Tier1, Tier2, Govorun supercomputer, Cloud, and NICA cluster. It did not require to send dedicated jobs since DIRAC was actively used for Monte-Carlo generation.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"101 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131809949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study of the structural properties of non-compact colloidal associates, as well as linear and branched polymers, is an important task of modern physical chemistry, since the structure at the nanoscale determines a number of important macroscopic features. Such systems often have fractal properties, i.e. they exhibit scale invariance in a number of characteristics. Numerous algorithms for constructing deterministic and stochastic fractal objects have been proposed recently. The former are based on an exact repetition of the shape at different scales, while when using the latter, the scaling ratios are observed only “on average”. In this paper, we propose a new algorithm for constructing a fractal object, called the Mobius fractal, which is essentially on the verge between regular and non-regular fractals. According to the correlation analysis, the fractal dimension of such a system is close to 1.75. The prospects for the further use in describing the results of experimental methods of structural diagnostics of nanomaterials, including small-angle scattering, are outlined.
{"title":"Stochastic fractal by deterministic algorithm: Introducing the Möbius fractal","authors":"O. Tomchuk","doi":"10.1063/5.0063292","DOIUrl":"https://doi.org/10.1063/5.0063292","url":null,"abstract":"The study of the structural properties of non-compact colloidal associates, as well as linear and branched polymers, is an important task of modern physical chemistry, since the structure at the nanoscale determines a number of important macroscopic features. Such systems often have fractal properties, i.e. they exhibit scale invariance in a number of characteristics. Numerous algorithms for constructing deterministic and stochastic fractal objects have been proposed recently. The former are based on an exact repetition of the shape at different scales, while when using the latter, the scaling ratios are observed only “on average”. In this paper, we propose a new algorithm for constructing a fractal object, called the Mobius fractal, which is essentially on the verge between regular and non-regular fractals. According to the correlation analysis, the fractal dimension of such a system is close to 1.75. The prospects for the further use in describing the results of experimental methods of structural diagnostics of nanomaterials, including small-angle scattering, are outlined.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131896921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Burtsev, T. Enik, Bogdan Topko, E. Martovitsky, A. Makankin, S. Khabarov, O. Tarasov, K. Salamatin, Elina Kasyanova, A. Ivanov, N. Zamyatin, Yu.M. Kopylov
MiniSPD is an installation for cosmic muon tests of all types of detectors to be used in the Spin Physics Detector (SPD) setup. The detectors and readout electronics for the NA64 experiment were used for testing. The MiniSPD setup includes the scintillator-based trigger system, straw, silicon, and Gas Electron Multiplier (GEM) tracking detectors, electromagnetic calorimeter, and the lead filter to remove the low-energy component of cosmic rays. The MiniSPD setup was used to measure such important parameters of detector prototypes and subsystems as the spatial and time resolution, efficiency, drift characteristics, amplification, data acquisition parameters, slow control implementation, and online monitoring systems features.
{"title":"MiniSPD testing facility","authors":"V. Burtsev, T. Enik, Bogdan Topko, E. Martovitsky, A. Makankin, S. Khabarov, O. Tarasov, K. Salamatin, Elina Kasyanova, A. Ivanov, N. Zamyatin, Yu.M. Kopylov","doi":"10.1063/5.0066806","DOIUrl":"https://doi.org/10.1063/5.0066806","url":null,"abstract":"MiniSPD is an installation for cosmic muon tests of all types of detectors to be used in the Spin Physics Detector (SPD) setup. The detectors and readout electronics for the NA64 experiment were used for testing. The MiniSPD setup includes the scintillator-based trigger system, straw, silicon, and Gas Electron Multiplier (GEM) tracking detectors, electromagnetic calorimeter, and the lead filter to remove the low-energy component of cosmic rays. The MiniSPD setup was used to measure such important parameters of detector prototypes and subsystems as the spatial and time resolution, efficiency, drift characteristics, amplification, data acquisition parameters, slow control implementation, and online monitoring systems features.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121805344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
U. Dmitrieva, N. Kozyrev, A. Svetlichnyi, I. Pshenichnov
Properties of spectator matter created in central (of 0-5% centrality) 197Au– 197Au and 208Pb– 208Pb collisions with energies typical for the Nuclotron based Ion Collider fAcility (NICA) accelerator complex are calculated with a recently developed Abrasion-Ablation Monte Carlo for Colliders (AAMCC) model. The sensitivity of cross-sections of emission of spectator neutrons to the nuclear deformation of 197Au and to the presence of neutron skin in 208Pb is demonstrated. The influence of the nuclear deformation of the 197Au on the forward-backward asymmetry of free spectator nucleons and on the asymmetry of the total volume of spectator matter is investigated.
{"title":"Spectator nucleons in most central collisions of heavy nuclei at NICA","authors":"U. Dmitrieva, N. Kozyrev, A. Svetlichnyi, I. Pshenichnov","doi":"10.1063/5.0063284","DOIUrl":"https://doi.org/10.1063/5.0063284","url":null,"abstract":"Properties of spectator matter created in central (of 0-5% centrality) 197Au– 197Au and 208Pb– 208Pb collisions with energies typical for the Nuclotron based Ion Collider fAcility (NICA) accelerator complex are calculated with a recently developed Abrasion-Ablation Monte Carlo for Colliders (AAMCC) model. The sensitivity of cross-sections of emission of spectator neutrons to the nuclear deformation of 197Au and to the presence of neutron skin in 208Pb is demonstrated. The influence of the nuclear deformation of the 197Au on the forward-backward asymmetry of free spectator nucleons and on the asymmetry of the total volume of spectator matter is investigated.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125192992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Priakhina, V. Trofimov, G. Ososkov, K. Gertsenberger
One of the uppermost tasks in creating a computing system of the NICA complex is predictive modeling of centers for storing and processing data from experimental setups of the complex, in particular, the BM@N experiment, and simulated events of particle collision for comparison with the expected results of real processes of data storage and processing. To solve the effective simulation problem, a new approach was chosen. It is based on the representation of information processes as byte streams and the use of probability distributions of significant data acquisition processes. The article presents the current status of the developed program and the first results of modeling centers for processing and storing data from the BM@N experiment of the NICA complex under different scenarios for launching jobs for the next run scheduled for 2021.
{"title":"Data center simulation for the BM@N experiment of the NICA project","authors":"D. Priakhina, V. Trofimov, G. Ososkov, K. Gertsenberger","doi":"10.1063/5.0063338","DOIUrl":"https://doi.org/10.1063/5.0063338","url":null,"abstract":"One of the uppermost tasks in creating a computing system of the NICA complex is predictive modeling of centers for storing and processing data from experimental setups of the complex, in particular, the BM@N experiment, and simulated events of particle collision for comparison with the expected results of real processes of data storage and processing. To solve the effective simulation problem, a new approach was chosen. It is based on the representation of information processes as byte streams and the use of probability distributions of significant data acquisition processes. The article presents the current status of the developed program and the first results of modeling centers for processing and storing data from the BM@N experiment of the NICA complex under different scenarios for launching jobs for the next run scheduled for 2021.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"528 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123080610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Multi-Purpose Detector (MPD) has been designed at the JINR to study the properties of hot nuclear matter at the NICA collider. The electromagnetic calorimeter is one of the subsystems responsible for the identification of γ-quanta, electrons and positrons. In addition, it is responsible for their separation from hadrons (for example, π0-mesons), as well as for measuring their energy. The electromagnetic calorimeter will consist of about 39000 separate modules that need pre-calibration. For this purpose, several trigger scintillation systems for studying ECal modules using cosmic rays and electron beams have been developed.
{"title":"Development of the scintillation counters for calibration of the NICA-MPD electromagnetic calorimeter modules","authors":"V. Ustinov, O. V. Kutinova, E. Sukhov","doi":"10.1063/5.0063291","DOIUrl":"https://doi.org/10.1063/5.0063291","url":null,"abstract":"The Multi-Purpose Detector (MPD) has been designed at the JINR to study the properties of hot nuclear matter at the NICA collider. The electromagnetic calorimeter is one of the subsystems responsible for the identification of γ-quanta, electrons and positrons. In addition, it is responsible for their separation from hadrons (for example, π0-mesons), as well as for measuring their energy. The electromagnetic calorimeter will consist of about 39000 separate modules that need pre-calibration. For this purpose, several trigger scintillation systems for studying ECal modules using cosmic rays and electron beams have been developed.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122683229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Using the dispersion approach to the axial anomaly by A.D. Dolgov and V.I. Zakharov, the non-Abelian case was considered for arbitrary virtualities of photon. Anomalous sum rules for the singlet current and transition form-factors π0, η, η′ → γγ(*) are derived. Using them, the behaviour of the non-perturbative gluon matrix element 〈0|GG˜|γγ(*)〉 was established both for the case of two real photons and for the case of one virtual photon in time-like and space-like domains. The possibility of a light pseudoscalar glueball-like state is conjectured.
{"title":"Anomaly sum rules for the case of a singlet current and their features","authors":"S. Khlebtsov, Y. Klopot, A. Oganesian, O. Teryaev","doi":"10.1063/5.0063551","DOIUrl":"https://doi.org/10.1063/5.0063551","url":null,"abstract":"Using the dispersion approach to the axial anomaly by A.D. Dolgov and V.I. Zakharov, the non-Abelian case was considered for arbitrary virtualities of photon. Anomalous sum rules for the singlet current and transition form-factors π0, η, η′ → γγ(*) are derived. Using them, the behaviour of the non-perturbative gluon matrix element 〈0|GG˜|γγ(*)〉 was established both for the case of two real photons and for the case of one virtual photon in time-like and space-like domains. The possibility of a light pseudoscalar glueball-like state is conjectured.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127909865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Slivin, G. Filatov, E. Syresin, A. Zhemchugov, A. Potylitsyn
Within the framework of the Nuclotron–based Ion Collider fAcility (NICA) project an Innovation Block is being constructed. It includes an applied research station for microchips with a package for radiation resistance testing. The ions up to Au with the energy range of 150-350 MeV/n are available for researches. The detailed overview of a technical station for irradiation by long-range ions is presented. A concept for reconstruction of the capsulated microchip structure at it’s interaction with high-energy ions was proposed.
{"title":"Reconstruction of microchip structure at its interaction with high energy ion beams of NICA accelerator complex","authors":"A. Slivin, G. Filatov, E. Syresin, A. Zhemchugov, A. Potylitsyn","doi":"10.1063/5.0063429","DOIUrl":"https://doi.org/10.1063/5.0063429","url":null,"abstract":"Within the framework of the Nuclotron–based Ion Collider fAcility (NICA) project an Innovation Block is being constructed. It includes an applied research station for microchips with a package for radiation resistance testing. The ions up to Au with the energy range of 150-350 MeV/n are available for researches. The detailed overview of a technical station for irradiation by long-range ions is presented. A concept for reconstruction of the capsulated microchip structure at it’s interaction with high-energy ions was proposed.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114327427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present the analysis of the identified hadrons (π±, K±) produced at mid-rapidity (|η| < 0.5) in collisions of Au-Au ions with energies SNN=4,7,9 and 11 GeV. Particle momentum spectra for charged hadrons (pions, kaons) are measured using data from Monte Carlo generator of Ultrarelativistic Quantum Molecular Dynamics (UrQMD) with particle reconstruction made with the response of Multi-Purpose Detector (MPD) obtained with GEANT3 simulations, on Monte Carlo input. We analyze particle multiplicity dependence on the collision energy. Centrality dependence of transverse momentum spectra was calculated for all particle species. Our goal is to study possible signatures of the phase transition between the hadron state of matter and the quark-gluon plasma (QGP) state.
{"title":"Investigation of the beam energy dependence of particle production in gold-gold collisions performed at NICA energy range","authors":"Elena A. Pervyshina, A. Aparin","doi":"10.1063/5.0064081","DOIUrl":"https://doi.org/10.1063/5.0064081","url":null,"abstract":"We present the analysis of the identified hadrons (π±, K±) produced at mid-rapidity (|η| < 0.5) in collisions of Au-Au ions with energies SNN=4,7,9 and 11 GeV. Particle momentum spectra for charged hadrons (pions, kaons) are measured using data from Monte Carlo generator of Ultrarelativistic Quantum Molecular Dynamics (UrQMD) with particle reconstruction made with the response of Multi-Purpose Detector (MPD) obtained with GEANT3 simulations, on Monte Carlo input. We analyze particle multiplicity dependence on the collision energy. Centrality dependence of transverse momentum spectra was calculated for all particle species. Our goal is to study possible signatures of the phase transition between the hadron state of matter and the quark-gluon plasma (QGP) state.","PeriodicalId":296008,"journal":{"name":"PROCEEDINGS OF THE 24TH INTERNATIONAL SCIENTIFIC CONFERENCE OF YOUNG SCIENTISTS AND SPECIALISTS (AYSS-2020)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130457993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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