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Model Investigation of Transverse Momentum Cumulants of Different Orders in Nuclear-Nuclear Collisions 核-核碰撞中不同阶横向动量累积量的模型研究
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700564
A. Zvyagina, E. Andronov

Abstract

In this research, we analyze transverse momentum cumulants of different orders (({{K}_{n}})) for charged inclusive hadrons produced in ({text{Bi}} + {text{Bi}}) collisions using the UrQMD-3.4 model events. The analysis is carried out in two ways: with the standard method, in which the study is carried out over the entire rapidity interval, and also with the sub-event method, which suppresses the influence of short-range correlations. Dependencies of second-, third-, and fourth-order cumulants on collision energy were obtained. The paper also provides a comparison of (p + p) and ({text{Bi}} + {text{Bi}}) collisions that indicated the simultaneous saturation for both systems at (sqrt {{{s}_{{NN}}}} approx 5) GeV.

摘要在这项研究中,我们使用UrQMD-3.4模型事件分析了在({text{Bi}} + {text{Bi}})碰撞中产生的带电包容强子的不同阶(({{K}_{n}}))横动量累积量。分析以两种方式进行:一种是标准方法,即在整个快速区间内进行研究;另一种是子事件方法,即抑制短程相关性的影响。研究得出了二阶、三阶和四阶累积量对碰撞能量的依赖关系。论文还对(p + p) 和({text{Bi}} + {text{Bi}})碰撞进行了比较,结果表明这两个系统在(sqrt {{s}_{{NN}}}} approx 5) GeV时同时达到饱和。
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引用次数: 0
Investigationof the np → npπ+π– Reaction at Momenta P0 > 3 GeV/c 对动量 P0 > 3 GeV/c 时 np → npπ+π- 反应的研究
IF 0.4 4区 物理与天体物理 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700552
A. P. Ierusalimov, S. G. Arakelyan, A. V. Belyaev, V. P. Ladygin, A. Yu. Troyan

Abstract

The (np to np{{pi }^{ + }}{{pi }^{ - }}) reaction is investigated at the incident neutron momenta ({{P}_{0}}) = 3.83 and 5.20 GeV/c. Contributions of different diagrams to the reaction cross section are calculated at the momenta from the threshold to 12 GeV/c. It is shown that the main contributions to the (np to np{{pi }^{ + }}{{pi }^{ - }}) reaction at momenta above ({{P}_{0}}) > 3 GeV/c come from diagrams of the reggeized (pi )-meson exchange model (OPER).To study spin effects, the reaction (np to np{{Delta }^{{ + + }}}{{Delta }^{ - }}) was separated. It is shown that description of the spin density matrix [({{rho }_{{ij}}})] requires taking into account the ρ-meson exchange diagram. The reaction (np to np{{rho }^{0}}) is separated by background subtraction method. The investigation has shown that ({{rho }^{0}})-meson production is described by suspended diagrams of the OPER model.

摘要 研究了入射中子矩({{P}_{0}}) = 3.83 和 5.20 GeV/c 时的(np to np{{{pi }^{ + }}{{pi }^{ - }}) 反应。在从阈值到 12 GeV/c 的时刻,计算了不同图对反应截面的贡献。结果表明,在时刻高于({{P}_{0}}) > 3 GeV/c时,对(np to np{{pi }^{ + }}{{pi }^{ - }}) 反应的主要贡献来自reggeized (pi )-介子交换模型(OPER)的图。为了研究自旋效应,对反应 (np to np{{Delta }^{{ + + }}}{{Delta }^{ - }}) 进行了分离。结果表明,描述自旋密度矩阵[({rho }_{ij}})]需要考虑ρ介子交换图。反应(np to np{{rho }^{0}})是通过背景减法分离出来的。研究表明,({{rho }^{0}})-介子产生是由 OPER 模型的悬浮图描述的。
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引用次数: 0
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 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700527
S. G. Shulha

Abstract

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.

摘要为了测量强子-强子对撞中夸克和胶子射流的特性,使用了两个射流样本。鉴于大型强子对撞机的喷流统计量很大,双样本方法需要考虑以下修正:(1)使用测量到的夸克和胶子喷流的分数而不是模型分数;(2)修正类型不明的喷流的贡献;(3)考虑夸克和胶子喷流的分布对喷流样本选择条件的依赖。本文提出了一种考虑到这些修正的改进型双样本方法。
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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 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700291
A. Mudrokh

Abstract

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 (sqrt {{{s}_{{NN}}}} = 9.2) GeV, is presented.

摘要测量轻质强子的光谱是位于日本核子中心的MPD实验的优先任务之一。MPD探测器记录了在能量为(sqrt {{{s}_{{NN}}}} = 9.2) GeV的铋核碰撞中产生的已识别强子的差分横动量谱的效率评估。
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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 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700667
L. P. Kaptari, S. M. Dorkin

Abstract

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 (T), Matsubara frequency ({{Omega }_{n}}) and three-momentum squared ({{k}^{2}}). It is found that in the vicinity of a certain value of the temperature ({{T}_{0}} sim 150) 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.

摘要 我们根据朗道规中的彩虹截断戴森-施文格方程研究了幽灵和胶子传播子的有限温度结构。早期用于模拟真空中夸克、幽灵和胶子传播子的方法被扩展到有限温度。在欧几里得空间,在松原虚时间形式主义中,戴森-施温格方程分裂为横向和纵向传播者的耦合方程系统。这个系统是在彩虹近似中考虑的,并在有限温度下进行数值求解。幽灵和胶子传播者的解是温度(T)、松原频率({{Omega }_{n}})和三动量平方({{k}^{2}})的函数。研究发现,在一定的温度值({{T}_{0}} sim 150) MeV附近,胶子的纵向传播者增加得相当快,而横向传播者并没有表现出任何不规则性。这与QCD晶格计算在这一温度区间得到的结果在性质上是一致的。
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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 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700436
O. V. Selyugin

Abstract

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 (s) and (t).

摘要在高能广义结构(HEGS)模型的框架内,分析TOTEM和ATLAS合作体在大型强子对撞机上获得的新实验数据,以及在SPS和Tevatron对撞机上获得的小动量转移的旧数据,可以确定强子弹性散射振幅的不同部分对曼德尔斯塔姆运动学变量(s)和(t)的依赖关系。
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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 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700886
D. A Nikiforov, A. E. Levichev, N. Abed

Abstract

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.

摘要 这项工作研究了现代 SR 源和对撞机电子束形成的一些特性。介绍了这一领域的发展趋势。讨论了已开发和正在设计的加速器设施的此类源的特征参数。介绍了俄罗斯科学院西伯利亚分院布德克核物理研究所(Budker Institute of Nuclear Physics, Siberian Branch)在电子枪领域的最新进展,以及该研究所为未来可能的 SR 源和对撞机开发电子源的计划。
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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 0.4 4区 物理与天体物理 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700539
S. N. Belokurova, V. V. Vechernin

Abstract

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 pp 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.

摘要 在弦融合和弦簇形成模型的框架内,研究了在大型强子对撞机能量下pp对撞中两个分离的快速窗口中倍率之间的相关性,并将所得结果与欧洲核子研究中心ALICE合作的数据进行了比较。模拟是在彩色夸克-胶子弦模型的蒙特卡罗实施框架内进行的。通过在撞击参数平面上实施有限晶格,考虑了弦融合效应。根据四个窗口宽度值和三个初始能量值,计算了两个快速观测窗口中倍率之间的相关系数与这些窗口之间距离的关系。结果表明,弦簇模型描述了相关系数行为的主要特征:相关系数随初始能量的增加而增加,随观察窗间快速距离的增加而减小,以及与快速窗宽度的非线性关系。
{"title":"Multiplicity Correlations in the Model with String Clusters in pp Collisions at LHC Energies","authors":"S. N. Belokurova, V. V. Vechernin","doi":"10.1134/s1063779624700539","DOIUrl":"https://doi.org/10.1134/s1063779624700539","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><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":null,"pages":null},"PeriodicalIF":0.4,"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
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 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700333
A. A. Glebov, E. A. Kolesnikova, A. N. Bugay

Abstract

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 12C, 28Si, and 56Fe particles was calculated.

摘要通过模拟成熟神经元的缺乏情况,可以预测重粒子辐照对海马认知障碍的影响。我们利用自己开发的成人神经发生数学模型来计算重粒子对成熟神经元数量的影响。为了再现实验数据,我们对模型进行了修改,以考虑神经干细胞在辐照下的死亡。因此,我们计算出了分裂的祖细胞、未成熟神经元的存活率,并首次计算出了用 12C、28Si 和 56Fe 粒子照射后成熟神经元的存活率。
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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 Q4 PHYSICS, PARTICLES & FIELDS Pub Date : 2024-08-18 DOI: 10.1134/s1063779624700850
M. Tokarev, I. Zborovský

Abstract

Some results of data analysis of hadron production in (p + p) and (A + A) collisions obtained in the framework of (z)-scaling are discussed. A possible signature of phase transition in the matter created in central ({text{Au}} + {text{Au}}) collisions in the scaling regime is observed. The concept of the (z)-scaling is based on the principles of self-similarity, locality and fractality of particle interactions at a constituent level. The self-similarity variable (z) and the scaling function (psi (z)) 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 ({{c}_{{{text{AuAu}}}}}) observed in (K_{S}^{0})-meson production in ({text{Au}} + {text{Au}}) collisions at RHIC are considered as an indication of phase transition in nuclear matter.

摘要 讨论了在(z)尺度框架下获得的(p + p) 和(A + A) 碰撞中强子产生的数据分析的一些结果。在中央({text{Au}} + {text{Au}})对撞中产生的物质在缩放机制下可能存在相变的特征。((z)-缩放)的概念是基于粒子相互作用在成分层面上的自相似性、局部性和碎裂性原理。自相似性变量((z))和缩放函数(psi (z))是通过实验可测量的量和一些模型参数来表示的,这些参数表征了碰撞物体的结构、碎裂过程和所产生介质的比热。在RHIC的({text{Au}} + {text{Au}})碰撞中观察到的(K_{S}^{0})-介子产生的分形熵和比热参数({{c}_{text{AuAu}}}}}})的不规则性被认为是核物质相变的一种迹象。
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引用次数: 0
期刊
Physics of Particles and Nuclei
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