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Analysis of pT Spectra and Rapidity Distributions for Light Hadrons in Simulated Bi + Bi Collisions at (sqrt {{{s}_{{NN}}}} = 9.2) GeV (sqrt {{{s}_{{NN}}}} = 9.2) GeV模拟Bi + Bi碰撞中轻强子的pT光谱和速度分布分析
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S106377962670142X
N. Kolomoyets
{"title":"Analysis of pT Spectra and Rapidity Distributions for Light Hadrons in Simulated Bi + Bi Collisions at (sqrt {{{s}_{{NN}}}} = 9.2) GeV","authors":"N. Kolomoyets","doi":"10.1134/S106377962670142X","DOIUrl":"10.1134/S106377962670142X","url":null,"abstract":"<p>The analysis of the reconstructed invariant <span>({{p}_{{text{T}}}})</span> spectra for the light hadrons (<span>({{pi }^{ pm }})</span>, <span>({{K}^{ pm }})</span>, <span>(p)</span>, and <span>(bar {p})</span>) is presented for simulated Bi + Bi collisions at <span>(sqrt {{{s}_{{NN}}}} = 9.2)</span> GeV for the MPD detector. The obtained spectra have been fitted with thermal models. The rapidity densities and meson yields have been obtained. The improvement of low-<span>({{p}_{{text{T}}}})</span> energy loss correction is presented.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1106 - 1111"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation Study of Dielectron Production in Bi + Bi Collisions at (sqrt {{{s}_{{NN}}}} ) = 9.2 GeV at NICA-MPD 在NICA-MPD上(sqrt {{{s}_{{NN}}}} ) = 9.2 GeV的Bi + Bi碰撞中产生介电子的模拟研究
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701248
Yonghong Wang,  Chi Yang
{"title":"Simulation Study of Dielectron Production in Bi + Bi Collisions at (sqrt {{{s}_{{NN}}}} ) = 9.2 GeV at NICA-MPD","authors":"Yonghong Wang,&nbsp; Chi Yang","doi":"10.1134/S1063779626701248","DOIUrl":"10.1134/S1063779626701248","url":null,"abstract":"<p>The Multi-Purpose Detector (MPD) at the NICA facility is designed to study heavy-ion collisions at <span>(sqrt {{{s}_{{NN}}}} )</span> = 4–11 GeV, aiming to explore the baryon-rich region of the QCD phase diagram to investigate the possible existence of a first-order phase transition and a critical end-point (CEP). Dileptons, serving as a key electromagnetic probe, are sensitive to the temperature, lifetime, and total baryon density of the hot, dense medium. The measurement of dielectrons is treated as an effective way to search for the QCD phase structure, chiral symmetry restoration, and possible CEP related phenomena. We present a feasibility study of dielectron production in Bi + Bi collisions at <span>(sqrt {{{s}_{{NN}}}} )</span> = 9.2 GeV using full MPD detector simulations with realistic event generators. Details are provided on electron reconstruction using the Time Projection Chamber (TPC), Time-of-Flight (TOF) detector, and Electromagnetic Calorimeter (ECal), background suppression techniques for photon conversions and <span>({{pi }^{0}})</span> Dalitz decays, and performance evaluation based on signal-to-background ratio (<span>(S{kern 1pt} /{kern 1pt} B)</span>) and statistical significance (<span>({{n}_{sigma }})</span>). These established reconstruction and background suppression procedures provide support for future experimental data analysis, and the results verify the ability of MPD to perform high-precision dielectron measurements.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1007 - 1013"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pion Spectra and Entropy per Rapidity in Au–Au Collisions at NICA Energies Using HRG Model with Resonance Decays and Tsallis Distribution 基于共振衰减和Tsallis分布的HRG模型在NICA能量下Au-Au碰撞中的介子谱和每速度熵
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701133
Mahmoud Nasar,  Mohammed Aish
{"title":"Pion Spectra and Entropy per Rapidity in Au–Au Collisions at NICA Energies Using HRG Model with Resonance Decays and Tsallis Distribution","authors":"Mahmoud Nasar,&nbsp; Mohammed Aish","doi":"10.1134/S1063779626701133","DOIUrl":"10.1134/S1063779626701133","url":null,"abstract":"<p>We study transverse momentum spectra and entropy per rapidity of charged pions in central Au–Au collisions at <span>(sqrt {{{s}_{{NN}}}} = 7.7)</span> and 11.5 GeV, relevant for the NICA energy range. The low-<span>({{p}_{{text{T}}}})</span> region is fitted with a Tsallis distribution, while the intermediate and high-<span>({{p}_{{text{T}}}})</span> parts are described by a hadron resonance gas (HRG) model including resonance decays. A smooth matching point ensures continuity between the two descriptions. The combined fits allow extrapolation toward <span>({{p}_{{text{T}}}} = 0)</span> and large <span>({{p}_{{text{T}}}})</span>, enabling robust estimates of entropy per rapidity. Results show that the hybrid Tsallis + HRG approach reproduces pion spectra across the full <span>({{p}_{{text{T}}}})</span> range with good accuracy, and the extracted entropy provides a sensitive thermodynamic probe of strongly interacting matter at high baryon density.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"946 - 951"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Developing a Microservices Architecture for Online Monitoring of MPD Experiment Data at the NICA Collider NICA对撞机MPD实验数据在线监测的微服务体系结构研究
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701558
A. V. Krylov, V. A. Krylov, O. V. Rogachevsky, S. Hnatic, J. Busa, A. A. Moshkin, A. V. Bychkov
{"title":"Developing a Microservices Architecture for Online Monitoring of MPD Experiment Data at the NICA Collider","authors":"A. V. Krylov,&nbsp;V. A. Krylov,&nbsp;O. V. Rogachevsky,&nbsp;S. Hnatic,&nbsp;J. Busa,&nbsp;A. A. Moshkin,&nbsp;A. V. Bychkov","doi":"10.1134/S1063779626701558","DOIUrl":"10.1134/S1063779626701558","url":null,"abstract":"<p>Modern experiments in high-energy physics are characterized by large volumes of data, requiring efficient methods of online processing and analysis. The Multi-Purpose Detector (MPD) experiment at the Nuclotron-based Ion Collider fAcility (NICA) is a state-of-the-art international high-energy physics experiment at the Joint Institute for Nuclear Research (JINR) and is scheduled to start in 2026. To operate the experiment, it is necessary to develop a monitoring system to control data from all detector subsystems (event display). To operate the event display, it is necessary to pre-process the data stream from the detectors in online mode. The implementation of this task requires the use of modern methods of parallel and distributed computing. The article presents the implementation of such a system based on microservice architecture for the MPD experiment.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1173 - 1176"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Holographic Equation of State Matched with Hadron Gas Equation as a Tool for the Study of the Quark-Gluon Plasma Evolution 与强子气体方程匹配的全息态方程作为研究夸克-胶子等离子体演化的工具
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701157
A. Anufriev, V. N. Kovalenko
{"title":"Holographic Equation of State Matched with Hadron Gas Equation as a Tool for the Study of the Quark-Gluon Plasma Evolution","authors":"A. Anufriev,&nbsp;V. N. Kovalenko","doi":"10.1134/S1063779626701157","DOIUrl":"10.1134/S1063779626701157","url":null,"abstract":"<p>In this paper, we discuss the matching of the holographic equation of state with the equation of Hadron Resonance Gas for studying the nuclear matter properties within the framework of relativistic heavy-ion collisions. Machine learning methods are applied to the calibration of free parameters of the model using the lattice QCD results for the physical values of quark masses. One of the most advanced procedures for matching is used with the function that approximates behavior of two models. Final hadronic spectra are obtained within multi-staged numerical approach of iEBE-MUSIC and SMASH-vHLLE packages. The code of relativistic hydrodynamics is modified by implementing a tabulated holographic equation of state, enabling simulations of quark-gluon plasma evolution with dynamically generated initial conditions via the 3D Monte Carlo Glauber Model and SMASH. Hybrid iSS and Hadron Sampler approaches are utilized at the freeze-out stage.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"957 - 962"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of Antiparticle Degrees of Freedom on Neutrino Flavor Oscillations in Frames of Quantum Field Theory 反粒子自由度对量子场论框架中中微子风味振荡的影响
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S106377962670108X
M. S. Dvornikov
{"title":"Impact of Antiparticle Degrees of Freedom on Neutrino Flavor Oscillations in Frames of Quantum Field Theory","authors":"M. S. Dvornikov","doi":"10.1134/S106377962670108X","DOIUrl":"10.1134/S106377962670108X","url":null,"abstract":"<p>We study neutrino flavor oscillations using the approach based on the quantum field theory (QFT), where neutrinos are taken to be virtual particles. One deals with the propagators of neutrino mass eigenstates in this formalism. Previously, while applying this approach to neutrino oscillations in external fields, we decomposed the propagators and used only the particle contribution in the calculation of the matrix element. In the present work, we carefully justify the validity of this kind of transformation by considering neutrino oscillations in vacuum. In principle, the results obtained can be extended for the QFT applied to neutrino oscillations in external fields.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"922 - 925"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Production of Charmed Particles in Proton–Proton and Light Nucleus–Nucleus Interactions in the Geant4 FTF Model Geant4 FTF模型中质子-质子和轻核-核相互作用中粲粒子的产生
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701492
A. Galoyan, A. Ribon, V. Uzhinsky
{"title":"Production of Charmed Particles in Proton–Proton and Light Nucleus–Nucleus Interactions in the Geant4 FTF Model","authors":"A. Galoyan,&nbsp;A. Ribon,&nbsp;V. Uzhinsky","doi":"10.1134/S1063779626701492","DOIUrl":"10.1134/S1063779626701492","url":null,"abstract":"<p>The total yield of neutral D-mesons (4<span>(pi )</span>) in central Xe + La interactions at 150 GeV per nucleon has been calculated within the Geant4 FTF model. Our results are consistent with predictions from other models based on Monte Carlo method that do not include quark-gluon plasma formation. Like those predictions, our calculation significantly underestimates the preliminary experimental data reported by the NA61/SHINE collaboration. The experimental data suggest enhanced production of charmed particles in nucleus-nucleus collisions. We also present calculations for charmed meson production in <span>(p + p)</span>, <span>(d + d)</span>, and <span>(^{{text{4}}}{text{He}} + ,{{,}^{4}}{text{He}})</span> interactions for the future NICA/SPD experiment at <span>(sqrt {{{s}_{{NN}}}} = )</span>10 and 20 GeV.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1141 - 1145"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transverse Momentum Distributions of Hadrons of Different Species in the Extended Multipomeron Exchange Model 扩展多重子交换模型中不同种类强子的横向动量分布
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701510
E. V. Andronov, A. M. Puchkov, V. V. Vechernin, V. N. Kovalenko
{"title":"Transverse Momentum Distributions of Hadrons of Different Species in the Extended Multipomeron Exchange Model","authors":"E. V. Andronov,&nbsp;A. M. Puchkov,&nbsp;V. V. Vechernin,&nbsp;V. N. Kovalenko","doi":"10.1134/S1063779626701510","DOIUrl":"10.1134/S1063779626701510","url":null,"abstract":"<p>A framework for particle production in high-energy collisions is developed within the multi-pomeron exchange model. To address the inconsistency between the Gaussian transverse momentum spectra from the Schwinger string hadronization mechanism and the thermal-like spectra observed in experimental data, event-by-event string tension fluctuations are incorporated. This modification naturally leads to thermal-like <span>({{p}_{{text{T}}}})</span>-distributions. The model is further extended to describe identified hadrons by accounting for resonance production and decay. A transverse-momentum-dependent effective decay matrix, handling full cascade decays, is implemented to correctly describe the yields and spectra of pions, kaons, and protons. The model successfully describes the <span>({{p}_{{text{T}}}})</span>-spectra of identified particles in <span>(pp)</span> collisions at LHC energy, demonstrating the essential role of string fluctuations and resonance feed-down for a consistent description of particle production.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1153 - 1157"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulating the TPC Detector Geometry for the MPD Experiment MPD实验中TPC探测器几何形状的模拟
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701479
A. V. Bychkov, O. V. Rogachevsky, S. Hnatic
{"title":"Simulating the TPC Detector Geometry for the MPD Experiment","authors":"A. V. Bychkov,&nbsp;O. V. Rogachevsky,&nbsp;S. Hnatic","doi":"10.1134/S1063779626701479","DOIUrl":"10.1134/S1063779626701479","url":null,"abstract":"<p>The NICA MPD experiment, like all modern physics experiments, is based on simulation data. Detailed geometry, containing information not only about the dimensions and materials of the detector’s structural elements but also about its internal volumes, is a necessary component of most stages of physical modeling. In some cases, other specialized geometries may also be used. The article is devoted to the geometries of MPD TPC (Time Projection Chamber) for the MpdRoot and ACTS software packages.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1133 - 1136"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fully Heavy Tetraquarks in the Hyperspherical Approach 超球面方法中的全重四夸克
IF 0.5 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2026-09-15 DOI: 10.1134/S1063779626701224
F. A. Martynenko, A. P. Martynenko, A. V. Eskin
{"title":"Fully Heavy Tetraquarks in the Hyperspherical Approach","authors":"F. A. Martynenko,&nbsp;A. P. Martynenko,&nbsp;A. V. Eskin","doi":"10.1134/S1063779626701224","DOIUrl":"10.1134/S1063779626701224","url":null,"abstract":"<p>In the hyperradial approximation, the Schröodinger equation for a heavy tetraquark is reduced to a one-dimensional equation after averaging over angles in hyperspace. This equation is solved numerically and analytically within the variational method. We take into account the main corrections from the Breit Hamiltonian in QCD.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"997 - 1001"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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