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On Measuring the Characteristics of Quark and Gluon Jets in Hadron–Hadron Collisions 关于测量强子-强子对撞中夸克和胶子射流的特征
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700527
S. G. Shulha
{"title":"On Measuring the Characteristics of Quark and Gluon Jets in Hadron–Hadron Collisions","authors":"S. G. Shulha","doi":"10.1134/s1063779624700527","DOIUrl":"https://doi.org/10.1134/s1063779624700527","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>To measure the characteristics of quark and gluon jets in hadron–hadron collisions, two samples of jets are used. Given the large statistics of jets at the LHC, the two-sample method requires taking into account the following corrections: (1) use of measured fractions of quark and gluon jets instead of the model ones, (2) amendment for the contribution of jets with an unidentified type, (3) taking into account the dependence of the distributions of quark and gluon jets on the conditions for jet sample selections. The paper presents an improved two-sample method that takes into account these corrections.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"20 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202376","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
Prospects of the MPD Detector for Measuring the Spectra of Identified Hadrons in $${mathbf{Bi}} + {mathbf{Bi}}$$ Collisions at Energy $$sqrt {{{s}_{{NN}}}} = 9.2$$ GeV MPD探测器在$${{mathbf{Bi}}+{mathbf{Bi}}$对撞中测量已识别中子光谱的前景+ {mathbf{Bi}}$ 对撞的能量 $$sqrt {{{s}_{{NN}}}} = 9.2$$ GeV
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700291
A. Mudrokh
{"title":"Prospects of the MPD Detector for Measuring the Spectra of Identified Hadrons in $${mathbf{Bi}} + {mathbf{Bi}}$$ Collisions at Energy $$sqrt {{{s}_{{NN}}}} = 9.2$$ GeV","authors":"A. Mudrokh","doi":"10.1134/s1063779624700291","DOIUrl":"https://doi.org/10.1134/s1063779624700291","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Measuring the spectra of light hadrons is one of the priority tasks of the MPD experiment at NICA. The assessment of the efficiency of recording differential transverse momentum spectra of production of identified hadrons in the MPD detector, which are produced in collisions of bismuth nuclei at an energy of <span>(sqrt {{{s}_{{NN}}}} = 9.2)</span> GeV, is presented.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"20 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202378","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
Gluon and Ghost Propagators at Finite Temperatures within a Dyson–Schwinger Approach 戴森-施温格方法中有限温度下的胶子和幽灵传播者
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700667
L. P. Kaptari, S. M. Dorkin
{"title":"Gluon and Ghost Propagators at Finite Temperatures within a Dyson–Schwinger Approach","authors":"L. P. Kaptari, S. M. Dorkin","doi":"10.1134/s1063779624700667","DOIUrl":"https://doi.org/10.1134/s1063779624700667","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We investigate the finite-temperature structure of ghost and gluon propagators within an approach based on the rainbow truncated Dyson–Schwinger equations in the Landau gauge. The method early used for modeling quark, ghost and gluon propagators in vacuum is extended to finite temperatures. In Euclidean space, within the Matsubara imaginary time formalism the Dyson–Schwinger equation splits into a system of coupled equations for transversal and longitudinal propagatators. This system is considered within the rainbow approximation generalized to finite temperatures and solved numerically. The solutions to the ghost and gluon propagators are obtained as functions of temperature <span>(T)</span>, Matsubara frequency <span>({{Omega }_{n}})</span> and three-momentum squared <span>({{k}^{2}})</span>. It is found that in the vicinity of a certain value of the temperature <span>({{T}_{0}} sim 150)</span> MeV the longitudinal gluon propagator increases quite fastly, whereas the transversal propagator does not exhibit any irregularity. This is in qualitative agreement with the results obtained within the QCD lattice calculations in this temperature interval.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"3 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202407","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
Quantum Phase Transitions in an Accelerated Medium 加速介质中的量子相变
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700709
G. Yu. Prokhorov, O. V. Teryaev, V. I. Zakharov
{"title":"Quantum Phase Transitions in an Accelerated Medium","authors":"G. Yu. Prokhorov, O. V. Teryaev, V. I. Zakharov","doi":"10.1134/s1063779624700709","DOIUrl":"https://doi.org/10.1134/s1063779624700709","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The usual Minkowski vacuum in an accelerated frame of reference is known to look like a “thermal bath” of particles. This effect is well known and called the Unruh effect, and is an analog of Hawking radiation in space with zero curvature. Thus, the Minkowski vacuum looks like a heated medium from the point of view of an accelerated observer, and the natural goal is to study the properties of such a medium in more detail. We show that if the Minkwoski vacuum is cooled, and we achieve a temperature below the Unruh temperature, then a phase transition occurs associated with the “fall beyond the horizon” of the lower Matsubara modes. This transition has many remarkable features, for example, for massless particles it is “polynomial,” and is also associated with the breaking of conformal symmetry.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"46 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202409","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
Dependence of the Structure of the Elastic Scattering Amplitude on Mandelstam Variables at High Energies 高能量下弹性散射振幅结构对曼德尔施塔姆变量的依赖性
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700436
O. V. Selyugin
{"title":"Dependence of the Structure of the Elastic Scattering Amplitude on Mandelstam Variables at High Energies","authors":"O. V. Selyugin","doi":"10.1134/s1063779624700436","DOIUrl":"https://doi.org/10.1134/s1063779624700436","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Analysis of new experimental data obtained by the TOTEM and ATLAS Collaborations at the LHC together with old data obtained at the SPS and Tevatron colliders at small momentum transfer in the framework of the high energy generalized structure (HEGS) model allows one to determine the dependence of different parts of the hadron elastic scattering amplitude on the mandelstam kinematic variables the <span>(s)</span> and <span>(t)</span>.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"59 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202371","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
Analysis of the Influence of Dose-Dependent Effects of Irradiation with Heavy Particles 12C, 28Si, and 56Fe on Neurogenesis in Adult C57BL/6J Mice 分析重粒子 12C、28Si 和 56Fe 辐照对成年 C57BL/6J 小鼠神经发生的剂量依赖性影响
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700333
A. A. Glebov, E. A. Kolesnikova, A. N. Bugay
{"title":"Analysis of the Influence of Dose-Dependent Effects of Irradiation with Heavy Particles 12C, 28Si, and 56Fe on Neurogenesis in Adult C57BL/6J Mice","authors":"A. A. Glebov, E. A. Kolesnikova, A. N. Bugay","doi":"10.1134/s1063779624700333","DOIUrl":"https://doi.org/10.1134/s1063779624700333","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Modeling the deficiency of mature neurons allows one to predict the development of hippocampus-dependent cognitive impairment in response to irradiation with heavy particles. We use a mathematical model of adult neurogenesis that we developed to calculate the effect of heavy particles on the numbers of mature neurons. To reproduce an experimental data, the model was modified to consider the death of neural stem cells in response to irradiation. As a result, the survival rate of dividing progenitor cells, immature neurons and, for the first time, mature neurons after irradiation with <sup>12</sup>C, <sup>28</sup>Si, and <sup>56</sup>Fe particles was calculated.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"8 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202379","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
On a Signature of Phase Transition in Heavy Ion Nuclear Matter 关于重离子核物质中的相变特征
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700850
M. Tokarev, I. Zborovský
{"title":"On a Signature of Phase Transition in Heavy Ion Nuclear Matter","authors":"M. Tokarev, I. Zborovský","doi":"10.1134/s1063779624700850","DOIUrl":"https://doi.org/10.1134/s1063779624700850","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Some results of data analysis of hadron production in <span>(p + p)</span> and <span>(A + A)</span> collisions obtained in the framework of <span>(z)</span>-scaling are discussed. A possible signature of phase transition in the matter created in central <span>({text{Au}} + {text{Au}})</span> collisions in the scaling regime is observed. The concept of the <span>(z)</span>-scaling is based on the principles of self-similarity, locality and fractality of particle interactions at a constituent level. The self-similarity variable <span>(z)</span> and the scaling function <span>(psi (z))</span> are expressed via the experimentally measurable quantities and some model parameters characterizing the structure of colliding objects, fragmentation process and specific heat of the produced medium. The irregularities of fractal entropy and specific heat parameter <span>({{c}_{{{text{AuAu}}}}})</span> observed in <span>(K_{S}^{0})</span>-meson production in <span>({text{Au}} + {text{Au}})</span> collisions at RHIC are considered as an indication of phase transition in nuclear matter.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"8 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202425","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
Development of Electron Sources for Modern and Future SR Sources and Colliders at the Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences 俄罗斯科学院西伯利亚分院布德克核物理研究所为现代和未来 SR 源和对撞机开发电子源
IF 0.4 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700886
D. A Nikiforov, A. E. Levichev, N. Abed
{"title":"Development of Electron Sources for Modern and Future SR Sources and Colliders at the Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences","authors":"D. A Nikiforov, A. E. Levichev, N. Abed","doi":"10.1134/s1063779624700886","DOIUrl":"https://doi.org/10.1134/s1063779624700886","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This work examines some properties of the formation of electron beams for modern SR sources and colliders. Trends in this area are described. Characteristic parameters of such sources for developed and designing accelerator facilities are discussed. Latest developments at the Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, in the field of electron guns are described, as well as plans for the development of electron sources at the institute for possible future SR sources and colliders are given.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"26 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202486","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
Multiplicity Correlations in the Model with String Clusters in pp Collisions at LHC Energies 大型强子对撞机能量下pp对撞中弦簇模型的多重相关性
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/S1063779624700539
S. N. Belokurova, V. V. Vechernin
{"title":"Multiplicity Correlations in the Model with String Clusters in pp Collisions at LHC Energies","authors":"S. N. Belokurova,&nbsp;V. V. Vechernin","doi":"10.1134/S1063779624700539","DOIUrl":"10.1134/S1063779624700539","url":null,"abstract":"<p>In the framework of the model with string fusion and the formation of string clusters, the correlations between multiplicities in two separated rapidity windows in <i>pp</i> collisions at LHC energies were studied and the results obtained were compared with data from the ALICE collaboration at CERN. The simulation is conducted within the framework of a Monte Carlo implementation of the color quark–gluon string model. String fusion effects are considered by implementing a finite lattice in the plane of the impact parameter. The dependence of the correlation coefficient between multiplicities in two rapidity observation windows on the distance between these windows is calculated for four values of their width and three values of initial energy. It is shown that the model with string clusters describes the major features of the behavior of the correlation coefficient: its increase with increasing initial energy, decrease with increasing rapidity distance between observation windows, and nonlinear dependence on the width of the rapidity window.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"55 4","pages":"904 - 908"},"PeriodicalIF":0.6,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202364","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
Femtoscopic Correlations of Charged Pions and Kaons in Au + Au Collisions at BES-I STAR Energy Region with the UrQMD Model 在 BES-I STAR 能区的 Au + Au 对撞中，用 UrQMD 模型计算带电质子和 Ka 离子的飞秒相关性
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2024-08-18 DOI: 10.1134/S1063779624700448
A. Korobitsyn, A. Kraeva, K. Mikhailov, G. Nigmatkulov, A. Pishchaeva
{"title":"Femtoscopic Correlations of Charged Pions and Kaons in Au + Au Collisions at BES-I STAR Energy Region with the UrQMD Model","authors":"A. Korobitsyn,&nbsp;A. Kraeva,&nbsp;K. Mikhailov,&nbsp;G. Nigmatkulov,&nbsp;A. Pishchaeva","doi":"10.1134/S1063779624700448","DOIUrl":"10.1134/S1063779624700448","url":null,"abstract":"<p>Femtoscopy is a primary tool for measuring the spatiotemporal characteristics of small and short-lived systems created in particle or nuclear collisions with an accuracy of 1 fm. The possibility of such measurements is due to the effects of quantum statistics and final state interactions which create the momentum correlations of two or more particles at small relative momenta in their center-of-mass system. We report on the calculations of like-sign koan femtoscopic correlations produced in Au + Au at the BES-I region from RHIC using the Ultrarelativistic Quantum Molecular Dynamics Model (UrQMD). We discuss the 3D pion and kaon radii as a function of the transverse momentum of the particles and the centrality of the collision.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"55 4","pages":"879 - 883"},"PeriodicalIF":0.6,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142412237","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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