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MPD: Multi-Purpose Detector of the NICA Collider NICA对撞机多用途探测器
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701387
S. V. Vereschagin
{"title":"MPD: Multi-Purpose Detector of the NICA Collider","authors":"S. V. Vereschagin","doi":"10.1134/S1063779624701387","DOIUrl":"10.1134/S1063779624701387","url":null,"abstract":"<p>The multi-purpose detector (MPD) is designed to study physical processes occurring in collisions of heavy relativistic nuclei in the energy range of the NICA (Nuclotron-based Ion Collider fAcility) collider <span>(sqrt {{{S}_{{NN}}}} )</span> = 4–11 GeV. MPD is the first physical installation that will work at the NICA collider. The project is currently in the final stages of construction. Particle detectors will be located inside a superconducting magnet creating a magnetic field of 0.5 T. They include three-dimensional particle registration systems based on a large cylindrical time-projection chamber (TPC) and identification systems consisting of a time-off-flight (TOF) detector and an electromagnetic calorimeter (ECal). To ensure a uniform magnetic field, a sophisticated cryogenic system is used that cools a superconducting solenoid to liquid helium temperatures. Once operational, MPD will become a powerful tool for studying the physics of heavy-ion collisions and improving our understanding of the fundamental properties of matter.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"177 - 185"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100356","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
Dark Matter Mediators in Processes of Single Top Quark Production 单顶夸克产生过程中的暗物质介质
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701740
E. E. Boos, V. E. Bunichev, L. V. Dudko
{"title":"Dark Matter Mediators in Processes of Single Top Quark Production","authors":"E. E. Boos,&nbsp;V. E. Bunichev,&nbsp;L. V. Dudko","doi":"10.1134/S1063779624701740","DOIUrl":"10.1134/S1063779624701740","url":null,"abstract":"<p>Multidimensional differential production cross sections have been obtained that characterize spin correlations in the processes of associative production of dark matter and a single top quark at the Large Hadron Collider. An analysis of processes involving scalar, pseudoscalar and vector mediator particles was carried out.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"429 - 433"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100388","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
The Energy Spectrum of the Excited States in Mesonic Helium 介子氦激发态的能谱
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701466
A. V. Eskin, V. I. Korobov, A. P. Martynenko, F. A. Martynenko
{"title":"The Energy Spectrum of the Excited States in Mesonic Helium","authors":"A. V. Eskin,&nbsp;V. I. Korobov,&nbsp;A. P. Martynenko,&nbsp;F. A. Martynenko","doi":"10.1134/S1063779624701466","DOIUrl":"10.1134/S1063779624701466","url":null,"abstract":"<p>Within the framework of the variational method in quantum electrodynamics, the energy levels of the excited states in mesonic helium and Σ hyper helium have been calculated. For the calculations, a basis of exponential wave functions has been used. The leading relativistic corrections, leading radiative corrections (self-energy and vacuum polarization), and recoil corrections have been applied.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"235 - 241"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100397","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
New Physics, W-Boson Mass, Semi-Inclusive Distributions, and Zeros of the Zeta Function 新物理学，w -玻色子质量，半包容分布和Zeta函数的零点
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701491
N. V. Makhaldiani
{"title":"New Physics, W-Boson Mass, Semi-Inclusive Distributions, and Zeros of the Zeta Function","authors":"N. V. Makhaldiani","doi":"10.1134/S1063779624701491","DOIUrl":"10.1134/S1063779624701491","url":null,"abstract":"<p>A contemporary definition of New Physics is proposed. A correction to the <i>W</i>-boson mass is calculated. Non-Riemann zeros of the zeta function proposed in [9] are tested by direct calculations.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"253 - 258"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100400","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
Three-Meson Tau Decays with Strange Particles in the NJL Model NJL模型中奇异粒子的三介子τ衰变
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701582
M. K. Volkov, A. A. Pivovarov, K. Nurlan
{"title":"Three-Meson Tau Decays with Strange Particles in the NJL Model","authors":"M. K. Volkov,&nbsp;A. A. Pivovarov,&nbsp;K. Nurlan","doi":"10.1134/S1063779624701582","DOIUrl":"10.1134/S1063779624701582","url":null,"abstract":"<p>A series of tau-lepton decays with three mesons in the final state involving strange particles has been considered in terms of the Nambu–Jona-Lasinio (NJL) model. The axial-vector, vector, and pseudoscalar channels have been considered. The dominance of the axial-vector channel has been shown. The results obtained are in a satisfactory agreement with the experimental data.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"326 - 329"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100172","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
Monte Carlo Simulation of the OLVE-HERO Orbital Experiment OLVE-HERO轨道实验的蒙特卡罗模拟
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701260
Kh. Karatash, I. Satyshev, L. G. Tkachev
{"title":"Monte Carlo Simulation of the OLVE-HERO Orbital Experiment","authors":"Kh. Karatash,&nbsp;I. Satyshev,&nbsp;L. G. Tkachev","doi":"10.1134/S1063779624701260","DOIUrl":"10.1134/S1063779624701260","url":null,"abstract":"<p>The High Energy Ray Observatory (HERO) is a project for a space experiment based on an ionization calorimeter to measure the spectrum and composition of cosmic rays. The effective geometric factor of the installation is not less than 12 m<sup>2</sup> sr for protons and not less than 16 m<sup>2</sup> sr for nuclei and electrons. During ~5–7 years of exposure, this mission will measure the element-by-element spectra of cosmic rays in the energy range 10<sup>12</sup> –10<sup>16</sup> eV/particle with a high energy resolution. A Monte Carlo simulation of the experiment using a borated scintillator as a part of the calorimeter is presented.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"113 - 117"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100183","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
Exact Solutions for the Scalar Field in the Gravitational Field of Spherically Symmetric Black Holes 球对称黑洞引力场中标量场的精确解
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701351
S. I. Keizerov, E. R. Rakhmetov, M. N. Smolyakov, I. P. Volobuev
{"title":"Exact Solutions for the Scalar Field in the Gravitational Field of Spherically Symmetric Black Holes","authors":"S. I. Keizerov,&nbsp;E. R. Rakhmetov,&nbsp;M. N. Smolyakov,&nbsp;I. P. Volobuev","doi":"10.1134/S1063779624701351","DOIUrl":"10.1134/S1063779624701351","url":null,"abstract":"<p>The problem of finding solutions to the Klein–Gordon equation for a free massive real scalar field in the spacetime of spherically symmetric black holes is considered. It is shown that the radial part of this equation can be reduced to the form of a confluent Heun equation. Physically adequate solutions to this equation expressed through confluent Heun functions are found and their normalizations are calculated. A doubling, compared to the case of the Minkowski space, of the number of physically adequate solutions with energy greater than that of the particle mass has been observed.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"162 - 167"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100258","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
Algorithm for Determination of Arrival Time of Signals from the Liquid Xenon Calorimeter of CMD-3 Detector cd -3探测器液氙量热计信号到达时间的确定算法
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701399
Yu. V. Yudin, L. B. Epshtein, K. Yu. Mikhailov
{"title":"Algorithm for Determination of Arrival Time of Signals from the Liquid Xenon Calorimeter of CMD-3 Detector","authors":"Yu. V. Yudin,&nbsp;L. B. Epshtein,&nbsp;K. Yu. Mikhailov","doi":"10.1134/S1063779624701399","DOIUrl":"10.1134/S1063779624701399","url":null,"abstract":"<p>In CMD-3 detector the <i>n</i>–<span>(bar {n})</span> pair production events can be detected only by the calorimeters where a large energy deposition from antineutron annihilation occurs. For identification of such events it is necessary to determine the arrival time of the calorimeter signals with accuracy of several nanoseconds. Preliminary estimations have shown that the required time resolution can be obtained only basing on signals of the liquid‑xenon calorimeter. The shapes of the liquid‑xenon calorimeter’s output electric signals differ substantially from event to event, thus an additional error is added to the measured signal arrival time even when a constant‑fraction discriminator is used. For measuring the arrival time of the liquid‑xenon calorimeter’s signals a special digital signal processing algorithm has been developed which allows one to reduce the error of signal arrival time determination added by the difference of signals' shapes. In this paper the developed algorithm is described and the results obtained after optimization of this algorithm on the real events data are presented.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"186 - 190"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100357","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
Measuring the ({{e}^{ + }}{{e}^{ - }} to {{pi }^{ + }}{{pi }^{ - }}2{{pi }^{0}}eta ) Cross Section with the SND Detector 用SND检测器测量({{e}^{ + }}{{e}^{ - }} to {{pi }^{ + }}{{pi }^{ - }}2{{pi }^{0}}eta )横截面
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S106377962470165X
A. A. Botov, M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, L. V. Kardapoltsev, D. P. Kovrizhin, A. A. Korol, A. S. Kupich, A. P. Kryukov, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, K. V. Pugachev, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, A. G. Kharlamov, D. A. Shtol
{"title":"Measuring the ({{e}^{ + }}{{e}^{ - }} to {{pi }^{ + }}{{pi }^{ - }}2{{pi }^{0}}eta ) Cross Section with the SND Detector","authors":"A. A. Botov,&nbsp;M. N. Achasov,&nbsp;A. Yu. Barnyakov,&nbsp;K. I. Beloborodov,&nbsp;A. V. Berdyugin,&nbsp;A. G. Bogdanchikov,&nbsp;T. V. Dimova,&nbsp;V. P. Druzhinin,&nbsp;V. N. Zhabin,&nbsp;L. V. Kardapoltsev,&nbsp;D. P. Kovrizhin,&nbsp;A. A. Korol,&nbsp;A. S. Kupich,&nbsp;A. P. Kryukov,&nbsp;N. A. Melnikova,&nbsp;N. Yu. Muchnoy,&nbsp;A. E. Obrazovsky,&nbsp;E. V. Pakhtusova,&nbsp;K. V. Pugachev,&nbsp;S. I. Serednyakov,&nbsp;Z. K. Silagadze,&nbsp;I. K. Surin,&nbsp;A. G. Kharlamov,&nbsp;D. A. Shtol","doi":"10.1134/S106377962470165X","DOIUrl":"10.1134/S106377962470165X","url":null,"abstract":"<p>The <span>({{e}^{ + }}{{e}^{ - }} to {{pi }^{ + }}{{pi }^{ - }}2{{pi }^{0}}eta )</span> process was studied by using the data collected with the SND detector at the VEPP-2000 <span>({{e}^{ + }}{{e}^{ - }})</span>-collider in 2011, 2012, and 2019–2021. The cross section of this process was measured in the center-of-mass energy region from 1.55 to 2 GeV. The cross section was fitted well by the vector dominance model (VDM) with the <span>(rho (1700))</span> and <span>(rho (2150))</span> resonances. Comparison with the only previous measurement at the BABAR detector was performed.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"370 - 373"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100390","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
Analytical Calculations of Contributions to the Anomalous Magnetic Moments of Leptons from Vacuum Polarization by Lepton Loops within the Mellin–Barnes Representation melin - barnes表示中轻子环对真空极化轻子反常磁矩贡献的解析计算
IF 0.6 4区 物理与天体物理
Physics of Particles and Nuclei Pub Date : 2025-05-20 DOI: 10.1134/S1063779624701508
O. P. Solovtsova, V. I. Lashkevich, L. P. Kaptari
{"title":"Analytical Calculations of Contributions to the Anomalous Magnetic Moments of Leptons from Vacuum Polarization by Lepton Loops within the Mellin–Barnes Representation","authors":"O. P. Solovtsova,&nbsp;V. I. Lashkevich,&nbsp;L. P. Kaptari","doi":"10.1134/S1063779624701508","DOIUrl":"10.1134/S1063779624701508","url":null,"abstract":"<p><b>Abstract</b>—Explicit analytical expressions have been derived for electromagnetic corrections to the anomalous magnetic moments <i>a</i><sub><i>L</i></sub> of leptons (<i>L</i> = <i>e</i>, μ, and τ) of the tenth order of the radiative corrections from Feynman diagrams with insertions of the polarization operator with four lepton loops, where one is formed by leptons of the same kind as initial the lepton <i>L</i>, and three others are formed by leptons of type <span>(ell ne L)</span>. The studies are based on the consecutive application of dispersion relations for the polarization operator and Mellin–Barnes transform for the propagators of massive particles. The exact formulas of expansion in the limit of low and high values of the ratios of lepton masses <i>r</i> = <span>({{{{m}_{ell }}} mathord{left/ {vphantom {{{{m}_{ell }}} {{{m}_{L}}}}} right. kern-0em} {{{m}_{L}}}})</span>, <i>r</i> → 0 and <i>r</i> → ∞, and compared with the corresponding asymptotic expressions of <i>a</i><sub><i>L</i></sub>, available in the literature.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"56 2","pages":"259 - 268"},"PeriodicalIF":0.6,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144100401","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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