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Magnetorotational Supernova Neutrino Spectra Versus Mass Ordering 磁旋超新星中微子光谱与质量排序
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/S1063779626701182
V. N. Kondratyev, A. A. Saimuha
{"title":"Magnetorotational Supernova Neutrino Spectra Versus Mass Ordering","authors":"V. N. Kondratyev,&nbsp;A. A. Saimuha","doi":"10.1134/S1063779626701182","DOIUrl":"10.1134/S1063779626701182","url":null,"abstract":"<p><b>Abstract</b>—Magnetic and oscillation effects in the dynamics of neutrinos emitted from a protoneutron star during a supernova explosion are considered. Nuclear scattering due to the neutral Gamow–Teller current interaction in the vicinity of the neutrino sphere is shown to result in the acceleration of neutrinos, especially, for heavy lepton components. The hardness of the electron antineutrino spectrum increases significantly due to oscillations in the outer layers of stars. Such an enhancement of the high-energy spectrum component is particularly pronounced for the inverted mass ordering and is favorable for ground-based detection of supernova neutrinos. The possibilities of Cherenkov underwater detectors—KM3NeT and Baikal-GVD—for the observation of supernova neutrinos and revealing the mass ordering are discussed.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"973 - 978"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965334","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
Strange Hadron Production in Au + Au Collisions at (sqrt {{{s}_{{NN}}}} = 3{-} 27) GeV with UrQMD 利用UrQMD在(sqrt {{{s}_{{NN}}}} = 3{-} 27) GeV的Au + Au碰撞中产生奇异强子
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/S1063779626701534
A. Timofeev, A. Korobitsin
{"title":"Strange Hadron Production in Au + Au Collisions at (sqrt {{{s}_{{NN}}}} = 3{-} 27) GeV with UrQMD","authors":"A. Timofeev,&nbsp;A. Korobitsin","doi":"10.1134/S1063779626701534","DOIUrl":"10.1134/S1063779626701534","url":null,"abstract":"<p>We study model dependence of strange hadron spectra (<span>(K_{S}^{0})</span>, <span>(Lambda )</span>, <span>(Xi )</span>, <span>(Omega )</span>) on transverse momentum, rapidity, and collision centrality in Au + Au collisions in the range of energies <span>(sqrt {{{s}_{{NN}}}} = 3{-} 27)</span> GeV using the UrQMD model. The results are compared with the data from RHIC Beam Energy Scan (BES) program. While the model shows reasonable agreement for <span>(K_{S}^{0})</span> spectra, it systematically underestimates the yields of strange and multi-strange hadrons over the entire energy range, with the discrepancy increasing with the strangeness content. The antibaryon-to-baryon and hadron-to-pion ratios are qualitatively reproduced, but significant quantitative deviations persist. These results demonstrate that, in its present form, the UrQMD model does not provide a satisfactory description of strange hadron observables at <span>(sqrt {{{s}_{{NN}}}} = 3{-} 27)</span> GeV, indicating the need for additional physical mechanisms beyond hadronic rescattering to account for strangeness production in high-density nuclear matter.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1163 - 1167"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965467","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
Collective Behavior of Hyperons in Pb–Pb Collisions with ALICE ALICE与Pb-Pb碰撞中超子的集体行为
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/S106377962670125X
A. Borissov, E. F. Dlin
{"title":"Collective Behavior of Hyperons in Pb–Pb Collisions with ALICE","authors":"A. Borissov,&nbsp;E. F. Dlin","doi":"10.1134/S106377962670125X","DOIUrl":"10.1134/S106377962670125X","url":null,"abstract":"<p>Hyperons created in non-central nucleus-nucleus collisions possess collective behavior known as elliptic flow (<span>({{v}_{2}})</span>). Also, hyperons are sensitive to the magnetic field and vorticity of the produced system resulting in their polarization. The measurement of elliptic flow and the polarization of Λ and <span>({{Xi }^{ - }})</span> hyperons in Pb–Pb collisions, performed with the ALICE detector at the LHC are presented.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1014 - 1017"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965471","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 J/Ψ Production and Gluon GPDs Effects 独家J/Ψ生产和胶子gpd效应
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/S1063779626701108
S. V. Goloskokov,  Ya-Ping Xie
{"title":"Exclusive J/Ψ Production and Gluon GPDs Effects","authors":"S. V. Goloskokov,&nbsp; Ya-Ping Xie","doi":"10.1134/S1063779626701108","DOIUrl":"10.1134/S1063779626701108","url":null,"abstract":"<p>Study of exclusive photoproduction of <span>({J mathord{left/ {vphantom {J psi }} right. kern-0em} psi })</span> mesons was carried out in a factorization approach. Generalized parton distributions (GPDs) for gluons, which play an important role here, are constructed using the double distribution representation. The obtained cross sections of <span>({J mathord{left/ {vphantom {J psi }} right. kern-0em} psi })</span> production in a wide energy range are in good agreement with the experiment. The spin asymmetries in the <span>({J mathord{left/ {vphantom {J psi }} right. kern-0em} psi })</span> production were estimated. These calculations were extended to the of <span>({J mathord{left/ {vphantom {J psi }} right. kern-0em} psi })</span> mesons production in ultraperipherical <span>(pp)</span> collisions. It was shown a good agreement of our results with the LHCb data. Predictions have been made for the NICA energy range. The model results can be used to study the gluon GPDs in future colliders.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"930 - 934"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965300","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
Non-Nucleonic Degrees of Freedom in Nuclei in Terms of the Quark Cluster Approach 用夸克簇方法研究原子核中的非核子自由度
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/S1063779626701455
I. T. Obukhovsky, M. N. Platonova
{"title":"Non-Nucleonic Degrees of Freedom in Nuclei in Terms of the Quark Cluster Approach","authors":"I. T. Obukhovsky,&nbsp;M. N. Platonova","doi":"10.1134/S1063779626701455","DOIUrl":"10.1134/S1063779626701455","url":null,"abstract":"<p>A theoretical framework for study of hidden-color components of nuclei is developed by using methods of nuclear cluster physics. The formalism is based on a constituent quark model with the QCD motivated <span>(qq)</span> interaction and on a novel dibaryon model of the <span>(NN)</span> interaction. Phenomenology of the dibaryon model is used for quantitative estimations of the weight of non-nucleonic components in the deuteron and of the contribution of such the components to the deuteron form factors.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1124 - 1129"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965340","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
Proton Production in a New Cumulative Region of Central Rapidities and Large Transverse Momenta Due to Coherent Quark Fusion 由相干夸克聚变引起的中心速度和大横向动量新累积区域的质子产生
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/S1063779626701339
V. V. Vechernin, S. V. Yurchenko
{"title":"Proton Production in a New Cumulative Region of Central Rapidities and Large Transverse Momenta Due to Coherent Quark Fusion","authors":"V. V. Vechernin,&nbsp;S. V. Yurchenko","doi":"10.1134/S1063779626701339","DOIUrl":"10.1134/S1063779626701339","url":null,"abstract":"<p>In this paper, we treat the process of proton production in a new cumulative region of central rapidities and large transverse momenta in the interaction of two fluctons due to the coherent fusion of three quarks. A general expression for the inclusive cross section of proton production in <i>dd</i> collisions for this process is found. The contribution of the coherent fusion of quarks to the production of protons is shown to dominate over the contribution from quark-to-proton fragmentation due to the smaller number of hard exchanges and the lack of need for all quarks to occupy a small region. For the same reason, the standard quark counting rules are violated in the process of fusion. The results obtained can be used in the SPD experiment to analyze proton yields in the new cumulative region in <i>dd</i> collisions at the NICA collider.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1056 - 1062"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965472","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
Study of the Higgs Boson in the ZH → ({{l}^{ + }}{{l}^{ - }}bbar {b}) Process Using Various Machine Learning Algorithms 利用各种机器学习算法研究ZH→({{l}^{ + }}{{l}^{ - }}bbar {b})过程中的希格斯玻色子
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/S1063779626701364
F. Ahmadov
{"title":"Study of the Higgs Boson in the ZH → ({{l}^{ + }}{{l}^{ - }}bbar {b}) Process Using Various Machine Learning Algorithms","authors":"F. Ahmadov","doi":"10.1134/S1063779626701364","DOIUrl":"10.1134/S1063779626701364","url":null,"abstract":"<p>A study of the Higgs boson in associated production with the <i>Z</i> boson and decay into <i>b</i> quarks (<i>H</i>→<span>(bbar {b})</span>) is performed using various machine learning algorithms. Only the decay of the <i>Z</i> boson into charged leptons, an electron-positron pair, or a muon-antimuon pair was selected. Signal-background classification was carried out using three machine learning algorithms: boosted decision tree, artificial neural network, and deep neural network. Signal and background events used for training were generated by the Monte Carlo event generators Powheg and Sherpa. About a million signal and background events were used to train machine learning algorithms. After optimizing all three algorithms, it was found that the best results in terms of performance or signal significance were obtained using artificial neural network. Switching from TMVA to TensorFlow, leveraging parallelism, has significantly enhanced neural network training performance. This advancement has effectively resolved the previously long training times in artificial neural networks, making them comparable to or better than those of boosted decision trees.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1073 - 1078"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965497","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
Light-by-Light Contribution to the Anomalous Magnetic Moment of Muon within the Nonlocal Chiral Quark Models 非局域手性夸克模型中对μ子异常磁矩的逐光贡献
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/S1063779626701522
A. E. Radzhabov, A. S. Zhevlakov
{"title":"Light-by-Light Contribution to the Anomalous Magnetic Moment of Muon within the Nonlocal Chiral Quark Models","authors":"A. E. Radzhabov,&nbsp;A. S. Zhevlakov","doi":"10.1134/S1063779626701522","DOIUrl":"10.1134/S1063779626701522","url":null,"abstract":"<p>A brief review of recent nonlocal quark model calculations of the hadronic light-by-light contribution to the muon’s anomalous magnetic moment is presented. To the leading order in <span>(1{kern 1pt} /{kern 1pt} {{N}_{{text{c}}}})</span>, the contribution consists of a quark box diagram supplemented by resonance exchanges. A key point in these calculations is that the two-photon transition form factors of the mesons in the model depend not only on the photons’ virtualities but also on that of the meson. Consequently, the quark box diagram provides the correct OPE asymptotic. It is shown that the model’s result is quite stable when the model is extended to include spin-1 particles.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"1158 - 1162"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965498","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 of Heavy-Ion Collisions for the SPD BBC Prototype SPD BBC原型机重离子碰撞模拟
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/S1063779626701121
K. S. Volkova, I. S. Volkov, V. P. Ladygin
{"title":"Simulation of Heavy-Ion Collisions for the SPD BBC Prototype","authors":"K. S. Volkova,&nbsp;I. S. Volkov,&nbsp;V. P. Ladygin","doi":"10.1134/S1063779626701121","DOIUrl":"10.1134/S1063779626701121","url":null,"abstract":"<p><b>Abstract</b>—The study of heavy-ion collisions at intermediate energies is a key direction of the future experimental program at the NICA accelerator complex. Within the scope of the collider commissioning activities, the installation of BBC prototype is planned at the SPD interaction point. To determine the preliminary operation conditions for the detector, the simulation of <sup>124</sup>Xe + W collisions at 3 GeV/nucleon was performed using the Geant4 framework. Different event generators were used to assess systematic uncertainties and enhance the reliability of the results. The simulation results are essential for optimizing the detector configuration and interpreting the first experimental data.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"941 - 945"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965507","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 In-Medium on the Proton–Nucleon Scattering Amplitude in the Proton–Nucleus Scattering at Incident Energies 12.7–1000 MeV 12.7-1000 MeV入射能量下质子核散射中介质对质子核散射振幅的影响
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/S1063779626701194
I. A. M. Abdulmagead, V. K. Lukyanov, E. V. Zemlyanaya, K. V. Lukyanov
{"title":"Impact of In-Medium on the Proton–Nucleon Scattering Amplitude in the Proton–Nucleus Scattering at Incident Energies 12.7–1000 MeV","authors":"I. A. M. Abdulmagead,&nbsp;V. K. Lukyanov,&nbsp;E. V. Zemlyanaya,&nbsp;K. V. Lukyanov","doi":"10.1134/S1063779626701194","DOIUrl":"10.1134/S1063779626701194","url":null,"abstract":"<p>The effect of nuclear medium on the proton-nucleon amplitude of scattering is investigated by analysing experimental data on the elastic scattering differential cross sections of protons on the target nucleus <sup>90</sup>Zr at the wide range of incident energies from 12.7 to 1000 MeV. This effect has a major impact on the proton-nucleon cross section σ, the most physically significant parameter of the proton–nucleus interaction potential. The in-medium parameter σ, which effectively reproduces experimental data at low incident energies, is significantly smaller than that in the case of scattering on the free nucleon. In contrast, at high incident energies, both the “in-medium” and “free” parameters σ are fairly similar to one another.</p>","PeriodicalId":729,"journal":{"name":"Physics of Particles and Nuclei","volume":"57 5","pages":"979 - 984"},"PeriodicalIF":0.5,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965515","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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