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Status of the Time-of-Flight and ECal Particle Identification Systems of the MPD Experiment at the NICA Collider
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924700723
V. Baryshnikov, V. Babkin, S. Bazylev, M. Bhattacharjee, A. Borisov, A. Burdyko, M. Buryakov, S. Buzin, A. Dmitriev, V. Dronik, I. Dubrovin, A. Dubrovin, P. Dulov, V. Golovatyuk, A. Kostylev, Y. Krechetov, V. Kulikov, S. Lobastov, M. Martemyanov, M. Rumyantsev, A. Semenov, A. Shutov, V. Shutov, T. Smolyanin, L. Stolypina, S. Sukhovarov, A. Terletskiy, I. Tyapkin, K. Vokhmyanina
{"title":"Status of the Time-of-Flight and ECal Particle Identification Systems of the MPD Experiment at the NICA Collider","authors":"V. Baryshnikov,&nbsp;V. Babkin,&nbsp;S. Bazylev,&nbsp;M. Bhattacharjee,&nbsp;A. Borisov,&nbsp;A. Burdyko,&nbsp;M. Buryakov,&nbsp;S. Buzin,&nbsp;A. Dmitriev,&nbsp;V. Dronik,&nbsp;I. Dubrovin,&nbsp;A. Dubrovin,&nbsp;P. Dulov,&nbsp;V. Golovatyuk,&nbsp;A. Kostylev,&nbsp;Y. Krechetov,&nbsp;V. Kulikov,&nbsp;S. Lobastov,&nbsp;M. Martemyanov,&nbsp;M. Rumyantsev,&nbsp;A. Semenov,&nbsp;A. Shutov,&nbsp;V. Shutov,&nbsp;T. Smolyanin,&nbsp;L. Stolypina,&nbsp;S. Sukhovarov,&nbsp;A. Terletskiy,&nbsp;I. Tyapkin,&nbsp;K. Vokhmyanina","doi":"10.3103/S0027134924700723","DOIUrl":"10.3103/S0027134924700723","url":null,"abstract":"<p>The MPD (Multipurpose Detector) experiment is being conducted at the Joint Institute for Nuclear Research in Dubna. This is an international project aimed at studying the properties of extremely hot and dense baryonic matter, which is formed during collisions of heavy ions, which are accelerated to high energies by the NICA accelerator complex. MPD includes various detector systems: time-of-flight (TOF) detector, time-projection camera (TPC), electromagnetic calorimeter (ECal), and others. TOF and TPC are involved in the identification of charged hadrons, and ECal—electrons and photons.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"33 - 38"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455583","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
Status of the COHERENT Experiment and New Physics Opportunities at the SNS Facility
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701686
A. M. Konovalov
{"title":"Status of the COHERENT Experiment and New Physics Opportunities at the SNS Facility","authors":"A. M. Konovalov","doi":"10.3103/S0027134924701686","DOIUrl":"10.3103/S0027134924701686","url":null,"abstract":"<p>The COHERENT collaboration measures coherent elastic neutrino-nucleus scattering (CEvNS) at Spallation Neutron Source (SNS) in Oak Ridge National Laboratory (ORNL) and explores related physics opportunities. In this paper we provide a status update of ongoing CEvNS efforts including the liquid argon, high-purity germanium and NaI[Tl] detectors, and share the plans of next-generation CEvNS experiments at SNS. We describe the effort aiming to measure neutrino inelastic interactions with <span>({}^{16})</span>O, <span>({}^{40})</span>Ar, <span>({}^{127})</span>I, <span>({}^{textrm{nat}})</span>Pb, and <span>({}^{232})</span>Th nuclei. We also provide a status update of the SNS neutrino flux measurement with a heavy water Cherenkov detector and present the COHERENT reach of accelerator-produced dark matter and sterile neutrino searches. Furthermore, we briefly describe ORNL plans of the SNS beampower upgrade and construction of the Second Target Station.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"220 - 226"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455600","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
Cumulative Production at Central Rapidities and Large Transverse Momenta in the Quark Model of Flucton Fragmentation
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701613
V. V. Vechernin, S. V. Yurchenko
{"title":"Cumulative Production at Central Rapidities and Large Transverse Momenta in the Quark Model of Flucton Fragmentation","authors":"V. V. Vechernin,&nbsp;S. V. Yurchenko","doi":"10.3103/S0027134924701613","DOIUrl":"10.3103/S0027134924701613","url":null,"abstract":"<p>Using the model of nucleon-flucton interaction, the yields of pions and protons are estimated in the new cumulative region of central rapidities and high transverse momenta, accessible for experimental study in dd collisions at the NICA SPD. It is shown that in this new region the yield of pions increases compared to protons, while in the region of fragmentation of a nucleus the yield of cumulative protons is dominant. The effect is explained by different mechanisms of their formation in the cumulative region—the coherent coalescence (recombination) of three flucton quarks to form a proton and the fragmentation of one flucton quark into a pion.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"174 - 178"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455511","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
Current Status and Future Prospects of Three-Flavor Oscillations with Accelerator Neutrino Beams
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701650
L. D. Kolupaeva
{"title":"Current Status and Future Prospects of Three-Flavor Oscillations with Accelerator Neutrino Beams","authors":"L. D. Kolupaeva","doi":"10.3103/S0027134924701650","DOIUrl":"10.3103/S0027134924701650","url":null,"abstract":"<p>The physics of neutrino oscillations has developed rapidly over the past few decades. Although there are still unmeasured parameters that determine this process. Measuring these parameters is the main goal of current and future projects in this area of particle physics. This review will discuss current neutrino accelerator experiments measuring three flavor neutrino oscillations (NOvA and T2K), and also briefly describe the prospects for future experiments (DUNE and Hyper-Kamiokande) and possible projects currently being considered.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"196 - 201"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455516","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
Neutrino Masses in Cosmology
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701662
S. Gariazzo
{"title":"Neutrino Masses in Cosmology","authors":"S. Gariazzo","doi":"10.3103/S0027134924701662","DOIUrl":"10.3103/S0027134924701662","url":null,"abstract":"<p>We review the status of neutrino mass constraints obtained from cosmological observations, with a particular focus on the results derived considering Cosmic Microwave Background (CMB) data by various experiments (Planck, ACT, and SPT), Baryon Acoustic Oscillation (BAO) determinations and other late-universe probes. We discuss the role played by priors and parameterizations in the Bayesian analyses, both at the time of determining neutrino masses or their ordering, and compare cosmological bounds with terrestrial constraints on both quantities.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"202 - 209"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455551","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
Hyperon Physics at BESIII
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924700875
Xiongfei Wang, on behalf of BESIII Collaboration
{"title":"Hyperon Physics at BESIII","authors":"Xiongfei Wang,&nbsp;on behalf of BESIII Collaboration","doi":"10.3103/S0027134924700875","DOIUrl":"10.3103/S0027134924700875","url":null,"abstract":"<p>The BESIII detector on the BEPCII collider collected the world’s largest dataset at the peaks of <span>(J/psi)</span>, <span>(psi(3686))</span> and <span>(psi(3770))</span>. The use of polarization and entanglement states in multidimensional angular distribution analysis can provide new probe to the production and decay characteristics of hyperon anti hyperon pairs. In a recent series of studies, significant transverse polarization in hyperon decay has been observed in <span>(J/psi)</span>, <span>(psi(3686))</span> decaying into the <span>(Lambdabar{Lambda})</span>, <span>(Sigma^{+}bar{Sigma}^{-})</span>, <span>(Xi^{0}bar{Xi}^{0})</span>, and <span>(Xi^{-}bar{Xi}^{+})</span> final states. The weak decay parameters of hyperons and antihyperons are also independently determined for the first time. The most accurate testing for direct <span>(CP)</span> violation has been achieved.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"105 - 110"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455588","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
Statistical Properties of Fractal Entropy of (boldsymbol{K_{S}^{0}})-Meson Production in Au + Au Collisions at RHIC
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924700917
M. Tokarev, I. Zborovský
{"title":"Statistical Properties of Fractal Entropy of (boldsymbol{K_{S}^{0}})-Meson Production in Au + Au Collisions at RHIC","authors":"M. Tokarev,&nbsp;I. Zborovský","doi":"10.3103/S0027134924700917","DOIUrl":"10.3103/S0027134924700917","url":null,"abstract":"<p>Properties of fractal entropy <span>(S_{delta,epsilon})</span> reflecting fractality as general feature of <span>(K_{S}^{0})</span>-meson production in Au + Au collisions in the <span>(z)</span>-scaling approach is studied. The entropy is expressed via the momentum fractions of the colliding nuclei and the momentum fractions of the secondary objects produced in constituent interactions. The structure of colliding nuclei and fragmentation processes is described by fractal dimensions. The principle of maximum entropy with the assumption of fractal self-similarity of hadron structure and fragmentation processes determines the underlying constituent subprocess and leads to the conservation of new quantity, named fractal cumulativity. Statistical properties of the fractal entropy, quantization of fractal dimensions, and their symmetry relations are discussed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"129 - 130"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455590","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
Exclusive Central Diffractive Production of Hadron Pairs in the Regge Eikonal Model at Energies from 30 GeV to 13 TeV
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-02-20 DOI: 10.3103/S0027134924701595
R. A. Ryutin
{"title":"Exclusive Central Diffractive Production of Hadron Pairs in the Regge Eikonal Model at Energies from 30 GeV to 13 TeV","authors":"R. A. Ryutin","doi":"10.3103/S0027134924701595","DOIUrl":"10.3103/S0027134924701595","url":null,"abstract":"<p>Recent results on the central exclusive diffractive production of dihadrons are presented in the framework of the Regge-eikonal model.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1 supplement","pages":"166 - 169"},"PeriodicalIF":0.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455633","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
Temperature Changes in the Mesopause Region due to Climate Changes in Recent Decades (1960–2024) 近几十年气候变化导致的中流层温度变化（1960-2024年）
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701984
I. I. Mokhov, V. I. Perminov, I. A. Fomina
{"title":"Temperature Changes in the Mesopause Region due to Climate Changes in Recent Decades (1960–2024)","authors":"I. I. Mokhov,&nbsp;V. I. Perminov,&nbsp;I. A. Fomina","doi":"10.3103/S0027134924701984","DOIUrl":"10.3103/S0027134924701984","url":null,"abstract":"<p>The results of an analysis of temperature variations in the mesopause region based on long-term measurements of hydroxyl airglow at the Zvenigorod Scientific Station of the Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences (ZSS IAP RAS) during 1960–2024 against the global-scale climate changes are presented. Along with temperature variations in the mesopause region, two versions of temperature variations in the mesopause region, normalized to the same level of solar activity, were analyzed. Quantitative estimates of a significant decrease in temperature in the mesopause region over the past decades in winter, against the background of global surface temperature increases, were obtained. Additionally, using cross-wavelet analysis of data for the time interval 1960–2024, significant coherence of their most long-term variations with the surface temperature in the Northern Hemisphere was noted, which had not been observed in data for shorter time intervals. The possibility of such coherence was predicted in (Mokhov et al., 2017) in the context of continued global warming based on the results of model simulations for the 20th–21st centuries, taking into account anthropogenic forcing, but it had not been observed in obsevational data for shorter time intervals. Along with long-term trends, notable features include a sharp temperature drop in the mesopause region during the 1970s and its synchronicity with the well-known shift in surface climate regimes associated with El Niño events. The results of cross-wavelet analysis using data obtained at ZSS IAP RAS for the time interval 1960–2024 indicate a more significant connection between temperature variations in the mesopause region and El Niño indices in recent decades.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"634 - 644"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995226","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
Dispersion- and Group Index Measurements in Dielectrics with Ultrashort Laser Pulses near the Bandgap Edge 带隙边缘附近超短激光脉冲介质色散和群指数的测量
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924702011
I. V. Savitsky, P. B. Glek, R. M. Aliev, E. A. Stepanov, A. A. Voronin, A. A. Lanin, A. B. Fedotov
{"title":"Dispersion- and Group Index Measurements in Dielectrics with Ultrashort Laser Pulses near the Bandgap Edge","authors":"I. V. Savitsky,&nbsp;P. B. Glek,&nbsp;R. M. Aliev,&nbsp;E. A. Stepanov,&nbsp;A. A. Voronin,&nbsp;A. A. Lanin,&nbsp;A. B. Fedotov","doi":"10.3103/S0027134924702011","DOIUrl":"10.3103/S0027134924702011","url":null,"abstract":"<p>A method for measuring the group refractive index and dispersion of dielectrics using a pump-probe scheme demonstrated with a ZnSe crystal. In this approach, an intense, ultrashort pump pulse causes ionization of the crystal, leading to scattering and absorption effects on the subsequent broadband probe pulse, which experiences dispersive broadening as it propagates through the crystal. By adjusting the time delay between the pump and probe pulses, we can effectively control the spectrum transmitted through the crystal, enabling the retrieval of both the group refractive index and dispersion characteristics.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"596 - 602"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995218","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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